Upload guidelines_final.json

guidelines_final.json

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+{
+  "guideline_id": "D001",
+  "category": "DFM",
+  "topic": "Wall Thickness",
+
+  "evaluation_criteria": [
+    "Verify nominal wall thickness follows recommended range for process (injection molding: 1.0–3.0 mm; die casting: 2.0–4.0 mm; machining: ≥1.0 mm).",
+    "Verify thickness transitions do not exceed a 30–50% sudden change to avoid sink/warp.",
+    "Verify ribs and bosses follow wall-thickness ratio rules (ribs ≤ 0.6 × nominal wall).",
+    "Verify uniformity across adjacent regions (variation ≤ ±10%).",
+    "Verify long unsupported walls meet stiffness requirement given thickness and height."
+  ],
+
+  "user_questions": [
+    "What is the process for this part? (injection_molding, die_casting, machining)",
+    "What is the nominal wall thickness in the primary regions (mm)?",
+    "What is the maximum wall-thickness variation between adjacent areas (mm)?",
+    "What is the rib or boss thickness relative to the nominal wall (mm)?",
+    "What is the maximum unsupported wall height (mm)?"
+  ],
+
+  "expected_answers": [
+    "Injection molding requires 1.0–3.0 mm; die casting 2.0–4.0 mm; machining ≥1.0 mm.",
+    "Nominal wall thickness must be within the allowed range for the chosen process.",
+    "Thickness variation must be ≤ ±10% of nominal wall thickness.",
+    "Rib/boss thickness must be ≤ 0.6 × nominal wall thickness.",
+    "Unsupported wall must satisfy stiffness rule: thickness ≥ (height / 20)."
+  ],
+
+  "pass_fail_logic": {
+    "process_wall_range_check": "FAIL if nominal_wall not within allowed_range_for_process.",
+    "thickness_uniformity_check": "FAIL if variation > (0.1 × nominal_wall).",
+    "rib_boss_ratio_check": "FAIL if rib_or_boss_thickness > (0.6 × nominal_wall).",
+    "transition_change_check": "FAIL if sudden_thickness_change > 0.5 × nominal_wall.",
+    "stiffness_check": "FAIL if nominal_wall < (unsupported_height / 20)."
+  },
+
+  "image_features_needed": [
+    "Extract wall regions and compute thickness.",
+    "Identify ribs and bosses and measure relative thickness.",
+    "Detect wall transitions between adjacent surfaces.",
+    "Segment unsupported wall spans and measure height/length.",
+    "Detect process-related geometry (ejection features signify molding)."
+  ]
+}
+
+{
+  "guideline_id": "D002",
+  "category": "DFM",
+  "topic": "Draft Angle",
+
+  "evaluation_criteria": [
+    "Verify minimum draft angle meets process requirements (injection molding: interior ≥1°, exterior ≥0.5°; die casting: ≥2°; sheet metal: ≥0° unless formed).",
+    "Verify deep features (depth/thickness > 4×) include additional draft (add +0.5° to +1°).",
+    "Verify textured surfaces include texture-compensation draft (add +1° per 0.025 mm texture depth).",
+    "Verify no negative draft exists unless explicitly required, as it indicates an undercut.",
+    "Verify draft direction aligns consistently with the parting line."
+  ],
+
+  "user_questions": [
+    "What manufacturing process is used? (injection_molding, die_casting, sheet_metal, machining)",
+    "What is the measured draft angle on the primary vertical interior walls (°)?",
+    "What is the measured draft angle on exterior vertical walls (°)?",
+    "What is the depth of the feature with the smallest draft angle (mm)?",
+    "Is the surface textured? If yes, provide texture depth (mm)."
+  ],
+
+  "expected_answers": [
+    "Injection molding requires: interior ≥1°, exterior ≥0.5°; die casting requires ≥2°; sheet metal requires ≥0° unless formed.",
+    "Interior draft must meet or exceed the required minimum for the chosen process.",
+    "Exterior draft must meet or exceed the required minimum for the chosen process.",
+    "Deep features must add +0.5° to +1° of draft when depth/thickness > 4×.",
+    "Textured surfaces must add +1° of draft per 0.025 mm texture depth."
+  ],
+
+  "pass_fail_logic": {
+    "interior_draft_check": "FAIL if process='injection_molding' AND interior_draft < 1.0.",
+    "exterior_draft_check": "FAIL if process='injection_molding' AND exterior_draft < 0.5.",
+    "die_cast_draft_check": "FAIL if process='die_casting' AND (interior_draft < 2.0 OR exterior_draft < 2.0).",
+    "deep_feature_check": "FAIL if (feature_depth/nominal_wall > 4) AND draft < (base_required_draft + 0.5).",
+    "texture_compensation_check": "FAIL if draft < (base_required_draft + texture_depth/0.025)."
+  },
+
+  "image_features_needed": [
+    "Detect vertical faces aligned with pull direction.",
+    "Compute draft angle relative to parting line.",
+    "Identify interior vs exterior surfaces.",
+    "Measure feature depth vs thickness to detect deep cores.",
+    "Detect textured regions and estimate texture depth if visible."
+  ]
+}
+
+{
+  "guideline_id": "D003",
+  "category": "DFM",
+  "topic": "Fillet Radius",
+
+  "evaluation_criteria": [
+    "Verify internal fillets meet minimum radius requirements for process (injection molding ≥ 0.5 × wall thickness; die casting ≥ 1.0 mm; machining ≥ tool radius).",
+    "Verify external fillets follow recommended minimum (≥ 0.25 × wall thickness).",
+    "Verify no sharp internal corners exist (sharp corners cause stress concentration and flow hesitation).",
+    "Verify intersecting rib/fillet blends follow recommended geometry (rib-root fillet ≥ 0.25 × rib thickness).",
+    "Verify fillet transitions are smooth and do not violate mold release or tool path constraints."
+  ],
+
+  "user_questions": [
+    "What is the manufacturing process? (injection_molding, die_casting, machining)",
+    "What is the wall thickness near the fillet location (mm)?",
+    "What is the internal fillet radius (mm)?",
+    "What is the external fillet radius (mm)?",
+    "What is the fillet radius at rib roots (mm)?"
+  ],
+
+  "expected_answers": [
+    "Injection molding internal fillet radius must be ≥ 0.5 × wall thickness.",
+    "External fillet radius must be ≥ 0.25 × wall thickness.",
+    "Machining fillet radius must be ≥ 1× tool radius used for internal corners.",
+    "Die casting fillet radius must be ≥ 1.0 mm for all internal corners.",
+    "Rib-root fillet radius must be ≥ 0.25 × rib thickness."
+  ],
+
+  "pass_fail_logic": {
+    "internal_fillet_check": "FAIL if process='injection_molding' AND internal_radius < (0.5 × wall).",
+    "external_fillet_check": "FAIL if external_radius < (0.25 × wall).",
+    "machining_tool_check": "FAIL if process='machining' AND internal_radius < tool_radius.",
+    "die_cast_fillet_check": "FAIL if process='die_casting' AND internal_radius < 1.0.",
+    "rib_root_check": "FAIL if rib_root_radius < (0.25 × rib_thickness)."
+  },
+
+  "image_features_needed": [
+    "Detect internal and external corners.",
+    "Extract fillet curvature and measure radius using contour curvature.",
+    "Identify ribs and measure rib-root fillet radius.",
+    "Segment regions by wall thickness to compute required radius.",
+    "Detect sharp corners and classify as non-fillet geometry."
+  ]
+}
+
+{
+  "guideline_id": "D004",
+  "category": "DFM",
+  "topic": "Rib Design",
+
+  "evaluation_criteria": [
+    "Verify rib thickness does not exceed 0.5 × adjacent wall thickness (to avoid sink marks in molding).",
+    "Verify rib height is ≤ 3 × rib thickness (to avoid weak/slender ribs).",
+    "Verify rib draft angle ≥ 0.5° per side (injection molding) to allow clean ejection.",
+    "Verify rib-root fillet radius ≥ 0.25 × rib thickness.",
+    "Verify spacing between ribs ≥ 2 × rib thickness (to maintain uniform flow and cooling)."
+  ],
+
+  "user_questions": [
+    "What is the adjacent wall thickness where the rib is attached (mm)?",
+    "What is the rib thickness (mm)?",
+    "What is the rib height (mm)?",
+    "What is the draft angle on the rib side walls (degrees)?",
+    "What is the fillet radius at the rib root (mm)?"
+  ],
+
+  "expected_answers": [
+    "Rib thickness must be ≤ 0.5 × wall thickness for injection molding.",
+    "Rib height must be ≤ 3 × rib thickness.",
+    "Draft angle must be ≥ 0.5° per side for ribs.",
+    "Rib-root fillet radius must be ≥ 0.25 × rib thickness.",
+    "Rib spacing must be ≥ 2 × rib thickness."
+  ],
+
+  "pass_fail_logic": {
+    "rib_thickness_check": "FAIL if rib_thickness > (0.5 × wall_thickness).",
+    "rib_height_check": "FAIL if rib_height > (3 × rib_thickness).",
+    "rib_draft_check": "FAIL if draft_angle < 0.5.",
+    "rib_root_fillet_check": "FAIL if fillet_radius < (0.25 × rib_thickness).",
+    "rib_spacing_check": "FAIL if spacing < (2 × rib_thickness)."
+  },
+
+  "image_features_needed": [
+    "Detect rib geometry (thin vertical wall-like features).",
+    "Measure rib thickness and height from side profiles.",
+    "Identify root fillets and measure radius via curvature extraction.",
+    "Detect rib spacing by identifying repetitive thin features.",
+    "Detect draft angle by analyzing rib wall taper relative to mold pull direction."
+  ]
+}
+
+{
+  "guideline_id": "D005",
+  "category": "DFM",
+  "topic": "Boss Design",
+
+  "evaluation_criteria": [
+    "Verify outer boss diameter is between 2.0 × and 2.5 × the screw/pin diameter (industry standard for molded bosses).",
+    "Verify boss wall thickness is ≤ 0.6 × the nominal wall thickness to prevent sink marks.",
+    "Verify boss height is ≤ 3 × the outer boss diameter to prevent buckling.",
+    "Verify draft angle on boss walls is ≥ 0.5° for clean ejection.",
+    "Verify base fillet radius ≥ 0.25 × boss wall thickness for stress reduction."
+  ],
+
+  "user_questions": [
+    "What is the screw or pin diameter intended for the boss (mm)?",
+    "What is the outer boss diameter (mm)?",
+    "What is the nominal part wall thickness (mm)?",
+    "What is the boss height (mm)?",
+    "What is the draft angle on the boss outer wall (degrees)?",
+    "What is the fillet radius at the boss base (mm)?"
+  ],
+
+  "expected_answers": [
+    "Outer boss diameter must be between 2.0 × and 2.5 × the screw/pin diameter.",
+    "Boss wall thickness must be ≤ 0.6 × nominal wall thickness.",
+    "Boss height must be ≤ 3 × outer boss diameter.",
+    "Draft angle must be ≥ 0.5° for molded bosses.",
+    "Boss base fillet radius must be ≥ 0.25 × boss wall thickness."
+  ],
+
+  "pass_fail_logic": {
+    "outer_diameter_check": "FAIL if outer_diameter < (2.0 × screw_diam) OR outer_diameter > (2.5 × screw_diam).",
+    "wall_thickness_check": "FAIL if boss_wall_thickness > (0.6 × nominal_wall_thickness).",
+    "boss_height_check": "FAIL if boss_height > (3 × outer_diameter).",
+    "draft_angle_check": "FAIL if draft_angle < 0.5.",
+    "fillet_radius_check": "FAIL if fillet_radius < (0.25 × boss_wall_thickness)."
+  },
+
+  "image_features_needed": [
+    "Detect cylindrical features (bosses) in the model.",
+    "Measure boss outer diameter and internal core diameter using circular feature extraction.",
+    "Measure boss wall thickness via diameter difference.",
+    "Determine boss height from vertical extrusion length.",
+    "Detect and measure draft angle by analyzing taper of cylindrical walls.",
+    "Measure fillet radius at boss base using curvature analysis."
+  ]
+}
+
+{
+  "guideline_id": "D006",
+  "category": "DFM",
+  "topic": "Material Shrinkage Compensation",
+
+  "evaluation_criteria": [
+    "Verify selected material shrink rate matches the manufacturing process (injection molding, die casting, blow molding).",
+    "Verify dimensional compensation added in the CAD model equals material shrink rate × nominal dimension.",
+    "Verify shrink direction is aligned with mold flow and part geometry.",
+    "Verify thick-to-thin transitions are uniform to prevent differential shrink.",
+    "Verify ribs, bosses, and reinforcing features meet shrink-sensitive design rules (uniform wall thickness, proper fillets, supported geometry)."
+  ],
+
+  "user_questions": [
+    "What is the material used (e.g., ABS, Nylon 6/6, PP, PBT, HDPE, Aluminum A380)?",
+    "What is the material shrink rate (%) recommended by the manufacturer?",
+    "What is the nominal dimension requiring shrink compensation (mm)?",
+    "Is the shrink direction aligned with the mold flow direction? (yes/no)",
+    "Does the part contain thick-to-thin transitions? If yes, provide the thickest and thinnest wall values (mm)."
+  ],
+
+  "expected_answers": [
+    "Shrink rate must match the process: Injection molding typical ranges: ABS 0.4–0.7%, Nylon 6/6 1.0–2.0%, PP 1.5–2.5%, PBT 1.2–2.0%, HDPE 1.5–3.0%; Die casting aluminum A380: 0.6%.",
+    "CAD dimensional compensation must equal: final_dimension = nominal_dimension × (1 + shrink_rate).",
+    "Shrink direction must match mold flow direction defined in the manufacturing plan.",
+    "Thick-to-thin wall transitions must maintain a ratio ≤ 1.5:1 to prevent differential shrink.",
+    "Ribs, bosses, and similar features must follow shrink-safe rules: rib thickness ≤ 0.6 × wall, boss thickness ≤ 0.6 × wall, fillet radii > 0.25 × wall."
+  ],
+
+  "pass_fail_logic": {
+    "material_shrink_rate_check": "FAIL if shrink_rate not in material_shrink_table[material].",
+    "dimensional_compensation_check": "FAIL if compensated_dimension != nominal_dimension × (1 + shrink_rate).",
+    "shrink_direction_check": "FAIL if shrink_direction != mold_flow_direction.",
+    "wall_ratio_check": "FAIL if (thick_wall / thin_wall) > 1.5.",
+    "feature_shrink_safety_check": "FAIL if ribs or bosses violate thickness or fillet rules."
+  },
+
+  "image_features_needed": [
+    "Measure nominal dimensions to check shrink-compensated geometry.",
+    "Detect thick and thin wall regions from sectional analysis.",
+    "Identify ribs, bosses, gussets and classify feature types.",
+    "Measure wall thickness distribution to detect shrink-risk areas.",
+    "Extract mold-flow direction cues (gate orientation, flow channels) when visible."
+  ]
+}
+
+{
+  "guideline_id": "D007",
+  "category": "DFM",
+  "topic": "Tool Access & Manufacturability",
+
+  "evaluation_criteria": [
+    "Verify all machining or molding tool paths have at least the minimum required approach clearance.",
+    "Verify no features require undercut tooling unless explicitly planned (side-actions, lifters, collapsible cores).",
+    "Verify minimum cutter diameter or mold pin diameter can physically access the feature.",
+    "Verify screw, bolt, or fastener access zones have adequate tool clearance (driver length, diameter).",
+    "Verify no enclosed geometry prevents ejection, extraction, or machining tool withdrawal."
+  ],
+
+  "user_questions": [
+    "What is the smallest tool (cutter, drill, or mold pin) that will be used to create the feature? Provide diameter in mm.",
+    "What is the minimum approach clearance available around the feature (mm)?",
+    "Does this geometry require undercuts? If yes, specify type: side-action, lifter, collapsible core, manual insert.",
+    "What fastener or assembly tool needs access to this region? Provide driver type (Phillips, Torx, Hex) and required clearance (mm).",
+    "Is the feature enclosed or partially enclosed such that tool or ejector withdrawal may be obstructed? (yes/no)"
+  ],
+
+  "expected_answers": [
+    "Feature must allow a tool larger than or equal to the minimum cutter/pin diameter: milling ≥ 2 mm, drilling ≥ 1 mm, mold pins ≥ 0.8 mm.",
+    "Approach clearance must be ≥ tool_diameter × 1.5 for safe entry (e.g., 2 mm tool → 3 mm clearance).",
+    "If an undercut exists, valid methods include: side-action, lifter, collapsible core; otherwise geometry must be redesigned.",
+    "Fastener tools require: Phillips/Torx drivers ≥ 40 mm length clearance and ≥ 1.5 × driver diameter radial clearance.",
+    "Enclosed geometry must allow withdrawal angle ≥ 2° or have an ejection strategy (pins, sleeves, lifters)."
+  ],
+
+  "pass_fail_logic": {
+    "tool_diameter_access_check": "FAIL if feature_width < minimum_tool_diameter.",
+    "approach_clearance_check": "FAIL if approach_clearance < (tool_diameter × 1.5).",
+    "undercut_check": "FAIL if undercut_present AND undercut_solution NOT IN ['side-action','lifter','collapsible core','manual insert'].",
+    "fastener_access_check": "FAIL if driver_clearance < (1.5 × driver_diameter) OR axial_clearance < 40 mm.",
+    "withdrawal_obstruction_check": "FAIL if enclosed_geometry == true AND withdrawal_angle < 2° AND no_ejector_strategy == true."
+  },
+
+  "image_features_needed": [
+    "Identify narrow channels, pockets, or recesses affecting tool access.",
+    "Measure minimum feature width for cutter or pin entry.",
+    "Detect potential undercut geometry from shadow or curvature patterns.",
+    "Identify driver/tool approach paths to fastener features.",
+    "Detect enclosed or partially enclosed volumes limiting tool withdrawal."
+  ]
+}
+
+{
+  "guideline_id": "D008",
+  "category": "DFM",
+  "topic": "Undercut Avoidance & Parting Line Design",
+
+  "evaluation_criteria": [
+    "Verify part geometry can be released from the mold without requiring undercuts unless intentionally designed.",
+    "Verify all faces are manufacturable with a two-plate mold unless additional actions are explicitly planned.",
+    "Verify parting line placement results in manufacturable draft on all vertical faces.",
+    "Verify no geometry traps steel (internal pockets with no pull direction).",
+    "Verify manual inserts, side-actions, or lifters are only used when unavoidable and are located with proper clearance."
+  ],
+
+  "user_questions": [
+    "Does the part contain any recessed or hooked geometry that blocks straight-pull release? (yes/no)",
+    "What is the draft angle on vertical walls adjacent to the suspected undercut region (degrees)?",
+    "Is there a required undercut? If yes, specify the type: side-action, lifter, collapsible core, manual insert.",
+    "What is the planned parting line direction and location? Provide the vector or description.",
+    "Do any internal pockets or cavities lack a clear pull direction? (yes/no)"
+  ],
+
+  "expected_answers": [
+    "Straight-pull manufacturability requires **0 undercuts** for a standard 2-plate mold.",
+    "Adjacent vertical walls must have ≥ **1° draft (minimum)**; recommended 2–3° for most plastics.",
+    "If an undercut exists, acceptable solutions: ['side-action','lifter','collapsible core','manual insert']; unlisted solutions = NOT acceptable.",
+    "Parting line must allow every face to pull in a single direction with required draft.",
+    "Internal pockets must have a pull direction OR be opened via a side-action; pockets with **no pull direction** violate manufacturability."
+  ],
+
+  "pass_fail_logic": {
+    "undercut_presence_check": "FAIL if undercut == true AND undercut_solution NOT IN ['side-action','lifter','collapsible core','manual insert'].",
+    "draft_angle_check": "FAIL if draft_angle < 1.",
+    "parting_line_check": "FAIL if any face cannot be drafted along chosen parting line.",
+    "steel_trap_check": "FAIL if steel_trap_detected == true.",
+    "internal_pocket_check": "FAIL if internal_pocket_without_pull == true."
+  },
+
+  "image_features_needed": [
+    "Detect hooked or recessed geometry indicating potential undercuts.",
+    "Identify parting line candidates based on geometry silhouette.",
+    "Measure draft angles by comparing wall direction to mold pull axis.",
+    "Detect steel traps by identifying fully enclosed wall contours.",
+    "Isolate internal cavities and determine if they have visible pull direction."
+  ]
+}
+
+{
+  "guideline_id": "D009",
+  "category": "DFM",
+  "topic": "Minimum Feature Size & Manufacturable Geometry",
+
+  "evaluation_criteria": [
+    "Verify all features meet the minimum manufacturable thickness or diameter for the intended process.",
+    "Verify small slots, holes, ribs, and text features do not fall below tooling or machining limits.",
+    "Verify depth-to-width ratios for cavities, pockets, or slots are within process limits.",
+    "Verify fillet radii at small features meet minimum radius requirements to avoid stress or tooling breakage.",
+    "Verify sharp corners or micro-features are replaced with manufacturing-appropriate radii or draft."
+  ],
+
+  "user_questions": [
+    "What is the smallest wall thickness or feature width in the part (mm)?",
+    "What is the smallest hole or pin diameter used (mm)?",
+    "What is the deepest pocket or cavity depth and its minimum width (depth and width in mm)?",
+    "What is the minimum fillet radius used in small interior corners (mm)?",
+    "Does any geometry include sharp corners, embossed/engraved text, or micro-details? If yes, specify feature size (mm)."
+  ],
+
+  "expected_answers": [
+    "Minimum wall thickness must meet process requirements: Injection molding: ABS ≥ 1.2 mm, Nylon ≥ 0.8 mm, PP ≥ 1.0 mm, PC ≥ 1.0 mm; Machining: ≥ 0.5 mm; Die casting: ≥ 1.0–1.5 mm.",
+    "Minimum hole diameter must be ≥ tooling limits: molded pin ≥ 0.8 mm, drilled hole ≥ 1.0 mm, machined endmill ≥ 2 mm typical.",
+    "Depth-to-width ratio must be ≤ 3:1 for milling and ≤ 2:1 for molding; deeper features require draft or special tooling.",
+    "Minimum fillet radius must be ≥ 0.25 mm in interior corners to avoid tool breakage or molded stress concentration.",
+    "Sharp corners and text features must follow minimum size rules: text stroke ≥ 0.4 mm (molded), engraving depth ≥ 0.2 mm, no zero-radius corners."
+  ],
+
+  "pass_fail_logic": {
+    "minimum_feature_size_check": "FAIL if smallest_feature < min_required_for_process.",
+    "hole_diameter_check": "FAIL if hole_diameter < min_tool_diameter.",
+    "aspect_ratio_check": "FAIL if (depth / width) > max_allowed_aspect_ratio_for_process.",
+    "fillet_radius_check": "FAIL if fillet_radius < 0.25 mm.",
+    "sharp_features_check": "FAIL if sharp_corner_detected AND radius == 0 AND no justification provided."
+  },
+
+  "image_features_needed": [
+    "Detect the smallest visible features (thin walls, slots, ribs, text).",
+    "Measure feature width and thickness using image-based dimension extraction.",
+    "Identify small holes or pin-sized features and measure diameters.",
+    "Detect deep cavities or pockets requiring aspect ratio evaluation.",
+    "Detect sharp corners or insufficient radii in high-stress or micro-detail areas."
+  ]
+}
+
+{
+  "guideline_id": "D010",
+  "category": "DFM",
+  "topic": "Assembly Direction & Self-Locating Features",
+
+  "evaluation_criteria": [
+    "Verify the assembly direction is linear (single-axis) and does not require rotation, twisting, or multi-axis insertion.",
+    "Verify alignment and self-locating features (tabs, chamfers, bosses) support repeatable assembly.",
+    "Verify insertion clearance fits standard assembly tolerances (typically 0.1–0.3 mm per side for plastics).",
+    "Verify no geometry creates jamming, interference, or binding during linear insertion.",
+    "Verify fastener, snap-fit, or press-fit elements are accessible along the same assembly axis."
+  ],
+
+  "user_questions": [
+    "What is the intended assembly direction for this part relative to its mating component? (Provide axis such as +Z, -X, etc.)",
+    "What is the clearance between mating features during insertion (mm)?",
+    "Does the part include self-locating features such as chamfers, tapered bosses, or alignment tabs? If yes, describe them.",
+    "Are there any points in the assembly where insertion force significantly increases or binding might occur? (yes/no)",
+    "Are fasteners, snaps, or press-fit features aligned with the main assembly direction? (yes/no)"
+  ],
+
+  "expected_answers": [
+    "Valid assembly directions include any single linear axis: ['+X','-X','+Y','-Y','+Z','-Z'].",
+    "Insertion clearance must be ≥ 0.1 mm (tight fit), 0.2–0.3 mm (standard fit), or >0.3 mm (loose fit).",
+    "Self-locating features must include at least one of: chamfer ≥ 0.5 mm, lead-in angle ≥ 10°, tapered boss with 1–2° draft.",
+    "Binding locations must be eliminated; acceptable answer: 'No binding points identified'.",
+    "Fasteners or snaps must be accessible from the assembly direction; otherwise redesign is required."
+  ],
+
+  "pass_fail_logic": {
+    "assembly_axis_check": "FAIL if assembly_direction NOT IN ['+X','-X','+Y','-Y','+Z','-Z'].",
+    "insertion_clearance_check": "FAIL if clearance < 0.1 mm.",
+    "self_locating_feature_check": "FAIL if no self_locating_features_present.",
+    "binding_check": "FAIL if binding_detected == true.",
+    "fastener_alignment_check": "FAIL if fasteners_or_snaps_not_accessible_from_assembly_direction == true."
+  },
+
+  "image_features_needed": [
+    "Identify assembly mating faces and highlight insertion axis.",
+    "Measure clearance gaps between mating surfaces and features.",
+    "Detect chamfers, tapers, alignment tabs, and bosses used for self-location.",
+    "Identify potential binding points such as misaligned walls or angled surfaces.",
+    "Detect orientation and accessibility of fasteners or snap-fit features."
+  ]
+}
+
+{
+  "guideline_id": "G011",
+  "category": "GDT",
+  "topic": "True Position Tolerance",
+
+  "evaluation_criteria": [
+    "Verify the true position tolerance (diameter zone) is appropriate for the hole/pin size and functional requirement.",
+    "Verify the datums referenced in the position callout exist and are stable, orthogonal, and fully constrained.",
+    "Verify hole center location deviation does not exceed allowed tolerance zone.",
+    "Verify hole orientation is aligned with the datum axis when required.",
+    "Verify pattern-of-holes share consistent datum reference and equalized tolerance distribution."
+  ],
+
+  "user_questions": [
+    "What is the hole diameter (mm)?",
+    "What is the specified true position tolerance (mm or mm at MMC)?",
+    "What are the referenced datums in the callout (e.g., A|B|C)?",
+    "What is the measured deviation of the hole center from nominal in X and Y (mm)?",
+    "Is this hole part of a hole pattern? If yes, how many holes and what spacing tolerance is required?"
+  ],
+
+  "expected_answers": [
+    "True position tolerance must follow typical ranges: small holes (≤5 mm): 0.05–0.15 mm; medium (5–12 mm): 0.1–0.25 mm; large (>12 mm): 0.2–0.5 mm.",
+    "Position tolerance at MMC increases allowable deviation by the bonus tolerance: tol = specified_tol + (MMC - actual_size).",
+    "Datums must include: A (primary planar surface), B (secondary orthogonal surface), C (third orthogonal surface).",
+    "Hole center deviation must satisfy: sqrt(dx² + dy²) ≤ tolerance_diameter / 2.",
+    "Hole patterns must maintain equal spacing with spacing tolerance ≤ 0.1–0.3 mm depending on functional requirement."
+  ],
+
+  "pass_fail_logic": {
+    "tolerance_range_check": "FAIL if position_tolerance < min_allowed_for_size OR > max_allowed_for_size.",
+    "datum_validity_check": "FAIL if datums_missing OR datums_non_orthogonal OR datums_unstable.",
+    "center_location_check": "FAIL if sqrt(dx*dx + dy*dy) > (tolerance_zone_diameter / 2).",
+    "orientation_check": "FAIL if required_orientation AND orientation_error > limit.",
+    "pattern_consistency_check": "FAIL if hole_spacing_error > spacing_tolerance."
+  },
+
+  "image_features_needed": [
+    "Detect hole centers using edge or centroid analysis.",
+    "Measure deviation between nominal and actual center positions.",
+    "Identify datum planes and axes visible in the drawing or model.",
+    "Measure hole diameter and verify MMC/LMC conditions.",
+    "Detect hole patterns and evaluate uniform spacing and alignment."
+  ]
+}
+
+{
+  "guideline_id": "G012",
+  "category": "GDT",
+  "topic": "Flatness",
+
+  "evaluation_criteria": [
+    "Verify the flatness tolerance is appropriate for the surface size and functional requirement.",
+    "Verify the measured surface variation (peak-to-valley) does not exceed the flatness tolerance.",
+    "Verify no warping, bowing, or twisting exceeds acceptable deformation levels.",
+    "Verify machining, molding, or casting process can realistically produce the specified flatness.",
+    "Verify the surface does not rely on external datums; flatness must be self-contained (datum-free tolerance)."
+  ],
+
+  "user_questions": [
+    "What is the flatness tolerance specified for this surface (mm)?",
+    "What is the measured peak-to-valley deviation across the surface (mm)?",
+    "What is the approximate surface size (length × width in mm)?",
+    "What is the material and manufacturing process for this part?",
+    "Does the surface show any visible warping, twisting, or bowing? (yes/no)"
+  ],
+
+  "expected_answers": [
+    "Flatness tolerance should follow typical limits: small surfaces (<50 mm): 0.02–0.05 mm; medium (50–150 mm): 0.05–0.15 mm; large (>150 mm): 0.1–0.3 mm.",
+    "Measured surface deviation must satisfy: peak_to_valley ≤ flatness_tolerance.",
+    "Larger surfaces require looser flatness: long plates >200 mm generally ≥ 0.1 mm.",
+    "Process limits: machining can achieve 0.01–0.05 mm; die casting typically 0.1–0.3 mm; molding 0.1–0.5 mm depending on geometry.",
+    "Flatness is free-state: no datums should be referenced in the flatness callout."
+  ],
+
+  "pass_fail_logic": {
+    "tolerance_feasibility_check": "FAIL if specified_flatness < minimum_process_capability.",
+    "deviation_check": "FAIL if measured_peak_to_valley > flatness_tolerance.",
+    "warping_check": "FAIL if warping_detected AND warping_amount > flatness_tolerance.",
+    "surface_size_reasonableness_check": "FAIL if surface_size > 200 mm AND flatness_tolerance < 0.05 mm (unrealistic).",
+    "datum_reference_check": "FAIL if flatness_callout_incorrectly_references_datum == true."
+  },
+
+  "image_features_needed": [
+    "Detect high and low points on the surface using shading or gradient mapping.",
+    "Measure effective surface curvature or deviation.",
+    "Identify signs of bowing or twisting from silhouette or edge contour.",
+    "Estimate size of the evaluated surface from image scale cues.",
+    "Detect datum references on drawings to ensure flatness is datum-free."
+  ]
+}
+
+{
+  "guideline_id": "G013",
+  "category": "GDT",
+  "topic": "Parallelism",
+
+  "evaluation_criteria": [
+    "Verify the referenced datum plane or axis is valid, stable, and orthogonal to other datums.",
+    "Verify the surface or axis being evaluated stays within the parallelism tolerance zone relative to the datum.",
+    "Verify parallelism tolerance is proportional to feature size and functional requirement.",
+    "Verify the manufacturing process can achieve the specified parallelism at the chosen tolerance.",
+    "Verify parallel surfaces do not show twist, taper, bow, or angular deviation exceeding tolerance."
+  ],
+
+  "user_questions": [
+    "What is the parallelism tolerance specified (mm or degrees)?",
+    "What datum (A/B/C) is referenced for the parallelism requirement?",
+    "What is the measured angular deviation between the evaluated surface and its datum (degrees)?",
+    "What is the measured peak-to-valley separation between the two surfaces (mm)?",
+    "What is the manufacturing process used (machining, grinding, molding, casting)?"
+  ],
+
+  "expected_answers": [
+    "Parallelism tolerance ranges: precision machining: 0.01–0.05 mm; standard machining: 0.05–0.1 mm; molded parts: 0.1–0.3 mm; cast parts: 0.2–0.5 mm.",
+    "A valid datum must be planar (e.g., A) or cylindrical (e.g., axis B) and must be stable and fully constrained.",
+    "Angular deviation must be ≤ 0.1° for precision fits, ≤ 0.3° for general fits, ≤ 1° for molded features.",
+    "Peak-to-valley variation must be ≤ the parallelism tolerance zone.",
+    "Process capability: grinding: 0.005 mm, machining: 0.02–0.1 mm, molding: 0.1–0.3 mm, casting: 0.2–0.5 mm."
+  ],
+
+  "pass_fail_logic": {
+    "datum_validity_check": "FAIL if datum_invalid OR datum_not_flat OR datum_not_stable.",
+    "angular_deviation_check": "FAIL if angular_deviation > allowed_angular_limit.",
+    "zone_variation_check": "FAIL if measured_PV > parallelism_tolerance.",
+    "process_capability_check": "FAIL if parallelism_tolerance < minimum_process_capability.",
+    "twist_or_bow_check": "FAIL if taper, bow, or twist detected beyond tolerance."
+  },
+
+  "image_features_needed": [
+    "Identify datum plane or axis from geometry or drawing.",
+    "Detect angular deviation between surfaces using edge direction analysis.",
+    "Measure surface separation or PV variation using contour mapping.",
+    "Identify twist or taper through silhouette comparison.",
+    "Infer process-related defects (warp, bend) from shading gradients or curvature."
+  ]
+}
+
+{
+  "guideline_id": "G014",
+  "category": "GDT",
+  "topic": "Perpendicularity",
+
+  "evaluation_criteria": [
+    "Verify the referenced datum (plane or axis) is valid, orthogonal, and stable.",
+    "Verify the evaluated surface or axis stays within the perpendicularity tolerance zone relative to the datum.",
+    "Verify the perpendicularity tolerance is appropriate for the functional requirement (press fits, bearings, alignment surfaces).",
+    "Verify measured angular deviation does not exceed allowable limits for the manufacturing process.",
+    "Verify no bow, twist, or taper causes out-of-square conditions exceeding tolerance."
+  ],
+
+  "user_questions": [
+    "What is the perpendicularity tolerance specified for this feature (mm or degrees)?",
+    "Which datum is referenced for the perpendicularity requirement (A/B/C)?",
+    "What is the measured angular deviation from 90° (degrees)?",
+    "What is the maximum measured deviation between the evaluated feature and the datum (mm)?",
+    "What is the manufacturing process for the feature (machining, grinding, molding, casting)?"
+  ],
+
+  "expected_answers": [
+    "Typical perpendicularity tolerance ranges: precision machining: 0.01–0.05 mm; standard machining: 0.05–0.1 mm; molding: 0.1–0.3 mm; casting: 0.2–0.6 mm.",
+    "Valid datums: planar A, planar B, or cylindrical axis C; must be fully constrained and orthogonal where required.",
+    "Measured angular deviation must be ≤ 0.1° for precision fits, ≤ 0.3° for standard fits, ≤ 1° for molded/cast surfaces.",
+    "Linear deviation at the measured height must be ≤ the perpendicularity tolerance zone.",
+    "Twist, bow, or out-of-square distortion must be ≤ tolerance or part fails functional alignment."
+  ],
+
+  "pass_fail_logic": {
+    "datum_validity_check": "FAIL if datum does not exist, is unstable, or is not orthogonal to required reference datums.",
+    "angular_deviation_check": "FAIL if angular_deviation > allowed_process_limit.",
+    "tolerance_zone_check": "FAIL if linear_deviation > perpendicularity_tolerance.",
+    "process_capability_check": "FAIL if tolerance < minimum_capability_for_process.",
+    "warp_or_twist_check": "FAIL if twist/bow/taper exceeds perpendicularity tolerance."
+  },
+
+  "image_features_needed": [
+    "Detect datum plane or axis from drawing or geometry.",
+    "Measure angle between evaluated surface and datum using edge-orientation extraction.",
+    "Measure max deviation across surface height for perpendicularity zone verification.",
+    "Detect twist, bow, or taper using silhouette curvature.",
+    "Identify machining or molding features that might cause angular error."
+  ]
+}
+
+{
+  "guideline_id": "G015",
+  "category": "GDT",
+  "topic": "Concentricity",
+
+  "evaluation_criteria": [
+    "Verify the datum axis is defined correctly and based on a stable cylindrical or planar feature.",
+    "Verify the derived median points of the evaluated cylinder remain within the concentricity tolerance zone.",
+    "Verify the concentricity tolerance is appropriate for the mating requirement (bearing fit, shaft fit, alignment pins).",
+    "Verify diameter deviation, ovality, and surface imperfections do not distort the derived axis.",
+    "Verify coaxial features share the same datum reference to ensure functional alignment."
+  ],
+
+  "user_questions": [
+    "What is the specified concentricity tolerance for this feature (mm)?",
+    "Which datum axis is referenced in the concentricity callout (A/B/C)?",
+    "What is the measured radial deviation of the evaluated axis relative to the datum (mm)?",
+    "What is the diameter of the cylinder being evaluated (mm)?",
+    "Is this feature intended to mate with another cylindrical component (shaft, bearing, dowel pin)? (yes/no)"
+  ],
+
+  "expected_answers": [
+    "Typical concentricity tolerances: high-precision bearing fits: 0.01–0.03 mm; standard alignment features: 0.05–0.1 mm; molded/cast cylindrical features: 0.1–0.3 mm.",
+    "Valid datum axis must come from a cylindrical feature with acceptable roundness (≤0.05 mm for precision).",
+    "Radial deviation must satisfy: deviation ≤ concentricity_tolerance / 2.",
+    "Cylinder diameter must be stable and consistent; ovality should be ≤ 0.3% of nominal diameter.",
+    "If mating, concentricity must be within the functional requirement of the paired part (e.g., shaft runout limits)."
+  ],
+
+  "pass_fail_logic": {
+    "datum_axis_validity_check": "FAIL if datum axis is unstable, oval, or derived from a distorted surface.",
+    "radial_deviation_check": "FAIL if radial_deviation > (concentricity_tolerance / 2).",
+    "ovality_check": "FAIL if ovality > (0.003 × nominal_diameter).",
+    "process_feasibility_check": "FAIL if concentricity_tolerance < minimum_process_capability.",
+    "mating_requirement_check": "FAIL if concentricity exceeds functional requirement for a mating part."
+  },
+
+  "image_features_needed": [
+    "Detect cylindrical features and estimate cylinder axis from silhouette or shading gradients.",
+    "Extract centerline deviation by sampling median points of cylinder sections.",
+    "Measure diameter consistency and detect ovality.",
+    "Identify referenced datum cylinder from drawing or geometry.",
+    "Detect mating features (holes, shafts) that impose coaxial requirements."
+  ]
+}
+
+{
+  "guideline_id": "G016",
+  "category": "GDT",
+  "topic": "Circularity",
+
+  "evaluation_criteria": [
+    "Verify the evaluated cross-sections of the cylindrical or round feature fall within the circularity tolerance band.",
+    "Verify the radial variation (max–min radius) does not exceed the specified circularity tolerance.",
+    "Verify the manufacturing process can realistically meet the circularity requirement for the selected material.",
+    "Verify circularity variation is not caused by ovality, lobing, tool chatter, or shrink-related distortion.",
+    "Verify all required cross-sections along the feature length meet the circularity requirement (not only mid-plane)."
+  ],
+
+  "user_questions": [
+    "What is the circularity tolerance specified for this feature (mm)?",
+    "What is the measured maximum radius and minimum radius across a cross-section (mm)?",
+    "What is the nominal diameter of the cylindrical feature (mm)?",
+    "What manufacturing process was used (turning, grinding, molding, casting, extrusion)?",
+    "Does the feature show signs of lobing or non-roundness (e.g., 2-lobe, 3-lobe patterns)? (yes/no)"
+  ],
+
+  "expected_answers": [
+    "Typical circularity tolerances: precision turned/grinded surfaces: 0.005–0.02 mm; standard machining: 0.02–0.05 mm; molded parts: 0.05–0.15 mm; cast parts: 0.1–0.3 mm.",
+    "Circularity band requirement: (max_radius - min_radius) ≤ circularity_tolerance.",
+    "Nominal diameter tolerance interaction: circularity must be < 25% of the size tolerance for high-precision fits.",
+    "Process capability: grinding ~0.005 mm, precision turning ~0.01 mm, molding ~0.05 mm+, casting ~0.1–0.3 mm.",
+    "Lobed patterns indicate tool vibration or mold distortion; if lobing exists, circularity is typically out of tolerance."
+  ],
+
+  "pass_fail_logic": {
+    "radius_variation_check": "FAIL if (max_radius - min_radius) > circularity_tolerance.",
+    "process_capability_check": "FAIL if specified_circularity < minimum_possible_for_process.",
+    "ovality_check": "FAIL if ovality > circularity_tolerance.",
+    "lobing_check": "FAIL if lobing_detected AND lobing_amplitude > circularity_tolerance.",
+    "section_consistency_check": "FAIL if any cross-section violates circularity tolerance."
+  },
+
+  "image_features_needed": [
+    "Detect circular cross-sections from edges or silhouette curvature.",
+    "Measure radial variation across sampled points around the circle.",
+    "Identify lobing patterns (e.g., 3-lobe, 4-lobe) common in machining or molding.",
+    "Measure diameter consistency to detect ovality vs. circularity deviation.",
+    "Infer process-related patterns (tool chatter, shrink distortion) from surface texture or geometry."
+  ]
+}
+
+{
+  "guideline_id": "G017",
+  "category": "GDT",
+  "topic": "Cylindricity",
+
+  "evaluation_criteria": [
+    "Verify all cross-sections of the cylinder maintain roundness within the cylindricity tolerance zone.",
+    "Verify the cylinder’s generatrix (surface line along its length) does not deviate beyond tolerance, ensuring no taper or barrel shape.",
+    "Verify the cylinder's axis remains straight and free from bending, bowing, or twisting deviations.",
+    "Verify surface imperfections such as ovality, lobing, or tool-chatter do not exceed the tolerance zone.",
+    "Verify the manufacturing process and material choice can realistically achieve the cylindricity requirement."
+  ],
+
+  "user_questions": [
+    "What is the cylindricity tolerance specified for this feature (mm)?",
+    "What is the maximum radial variation measured along the cylinder at any cross-section (mm)?",
+    "What is the maximum straightness deviation of the cylinder’s axis over its full length (mm)?",
+    "What is the nominal diameter and total cylinder length (mm)?",
+    "What manufacturing process was used (turning, grinding, molding, casting)?"
+  ],
+
+  "expected_answers": [
+    "Typical cylindricity ranges: precision grinding: 0.005–0.02 mm; precision turning: 0.01–0.05 mm; standard machining: 0.05–0.1 mm; molding: 0.05–0.2 mm; casting: 0.1–0.4 mm.",
+    "Radial variation in any cross-section must satisfy: (max_radius - min_radius) ≤ cylindricity_tolerance.",
+    "Axis straightness deviation must be ≤ cylindricity_tolerance (to avoid taper, bow, or barrel shapes).",
+    "Length-to-diameter ratio considerations: long thin cylinders (L/D > 10) may require looser tolerance or grinding.",
+    "Process capability: grinding ≈ 0.005 mm; high-precision turning ≈ 0.01 mm; molding/casting significantly higher."
+  ],
+
+  "pass_fail_logic": {
+    "cross_section_variation_check": "FAIL if radial_variation > cylindricity_tolerance.",
+    "axis_straightness_check": "FAIL if axis_deviation > cylindricity_tolerance.",
+    "taper_or_barrel_check": "FAIL if measured_diameter_change_along_length > cylindricity_tolerance.",
+    "process_capability_check": "FAIL if cylindricity_tolerance < minimum_process_capability.",
+    "lobing_or_ovality_check": "FAIL if lobing_amplitude > cylindricity_tolerance OR ovality > cylindricity_tolerance."
+  },
+
+  "image_features_needed": [
+    "Extract cylindrical surface using edge/curvature segmentation.",
+    "Measure diameter consistency across multiple cross-sections along the cylinder length.",
+    "Estimate cylinder axis deviation by comparing sampled points along its generatrix.",
+    "Detect taper, bow, barrel, or hourglass shapes through silhouette curvature.",
+    "Identify lobing (2-lobe, 3-lobe, 4-lobe patterns) or molded distortions using roundness profiles."
+  ]
+}
+
+{
+  "guideline_id": "G018",
+  "category": "GDT",
+  "topic": "Runout",
+
+  "evaluation_criteria": [
+    "Verify the datum axis used for runout measurement is stable, straight, and properly established.",
+    "Verify circular runout is measured by rotating the part and ensuring surface variation stays within tolerance.",
+    "Verify total runout considers full surface variation (radial + axial) along the entire length of the feature.",
+    "Verify runout tolerance is appropriate for functional requirements (rotating shafts, bearings, gears).",
+    "Verify geometry defects such as wobble, tilt, bend, or taper do not exceed the allowed tolerance zone."
+  ],
+
+  "user_questions": [
+    "Is the callout specifying circular runout or total runout?",
+    "What is the runout tolerance specified (mm)?",
+    "What datum axis is referenced for the runout measurement (A/B/C)?",
+    "What is the maximum radial deviation measured during rotation (mm)?",
+    "What is the maximum axial deviation of the feature along its length (mm)?"
+  ],
+
+  "expected_answers": [
+    "Circular runout typical ranges: precision rotating shafts: 0.005–0.02 mm; standard machined shafts: 0.02–0.05 mm; molded/cast rotating parts: 0.05–0.15 mm.",
+    "Total runout typical ranges: grinding: 0.005–0.01 mm; precision turning: 0.01–0.03 mm; standard machining: 0.03–0.08 mm.",
+    "Radial deviation must satisfy: radial_runout ≤ runout_tolerance.",
+    "Axial deviation must satisfy (for total runout): axial_runout ≤ runout_tolerance.",
+    "Datum axis must come from a stable cylindrical reference with roundness typically < 0.05 mm."
+  ],
+
+  "pass_fail_logic": {
+    "datum_axis_validity_check": "FAIL if datum axis is unstable, non-round, or misaligned.",
+    "radial_runout_check": "FAIL if radial_runout > runout_tolerance.",
+    "axial_runout_check": "FAIL if total_runout_callout AND axial_runout > runout_tolerance.",
+    "surface_profile_check": "FAIL if taper, wobble, or bow generate deviation beyond tolerance.",
+    "process_capability_check": "FAIL if runout_tolerance < minimum_process_capability."
+  },
+
+  "image_features_needed": [
+    "Identify cylindrical datum features for axis extraction.",
+    "Measure radial movement of the surface profile during simulated rotation analysis.",
+    "Measure axial deviation by comparing slices along the cylindrical height.",
+    "Detect wobble or tilt through curvature/edge deviation patterns.",
+    "Identify taper or bow shapes based on silhouette geometry."
+  ]
+}
+
+
+{
+  "guideline_id": "G019",
+  "category": "GDT",
+  "topic": "Profile Tolerance",
+
+  "evaluation_criteria": [
+    "Verify the profile tolerance zone width is appropriate for the functional requirement of the feature.",
+    "Verify the measured deviation between the actual geometry and nominal CAD profile stays within tolerance.",
+    "Verify referenced datums (if any) fully constrain location and orientation for surface profile control.",
+    "Verify both inward and outward deviation are controlled symmetrically unless unilateral profile is specified.",
+    "Verify complex surfaces (freeform, aerodynamic, ergonomic) maintain continuous curvature and no abrupt transitions beyond tolerance."
+  ],
+
+  "user_questions": [
+    "Is the profile callout specifying profile of a line or profile of a surface?",
+    "What is the specified profile tolerance zone width (mm)?",
+    "What datums (if any) are referenced in the profile callout?",
+    "What is the maximum measured deviation from the nominal CAD profile (mm)?",
+    "Is the profile unilateral or bilateral? (If unilateral, specify + or – direction.)"
+  ],
+
+  "expected_answers": [
+    "Typical profile tolerance ranges: precision machined surfaces: 0.02–0.1 mm; molded surfaces: 0.1–0.3 mm; cast surfaces: 0.3–1.0 mm; freeform aesthetic surfaces: 0.1–0.5 mm depending on class A requirements.",
+    "Profile deviation must satisfy: deviation ≤ (profile_tolerance / 2) for bilateral zones.",
+    "Datum references: A for primary plane, B for secondary orientation, C for tertiary constraint.",
+    "Deviation peaks must not exceed tolerance even in high curvature regions.",
+    "Unilateral profile must satisfy: deviation ≤ +tolerance OR ≤ –tolerance depending on direction."
+  ],
+
+  "pass_fail_logic": {
+    "profile_zone_width_check": "FAIL if profile_tolerance < minimum_feasible_for_process.",
+    "deviation_check": "FAIL if any measured_deviation > (profile_tolerance / 2) for bilateral profiles.",
+    "datum_constraint_check": "FAIL if referenced_datums_needed AND datums_missing OR unstable.",
+    "unilateral_profile_check": "FAIL if unilateral_profile AND deviation exceeds allowed side.",
+    "curvature_continuity_check": "FAIL if abrupt curvature change exceeds tolerance."
+  },
+
+  "image_features_needed": [
+    "Extract boundary curves (for line profile) or surface patches (for surface profile).",
+    "Compare the detected geometry to nominal CAD silhouette or expected ideal shape.",
+    "Measure the maximum deviation between actual and nominal geometry.",
+    "Identify curvature continuity issues, ripples, or abrupt transitions.",
+    "Detect datum references on the drawing or implied datum alignment from geometry."
+  ]
+}
+
+
+{
+  "guideline_id": "G020",
+  "category": "GDT",
+  "topic": "Datum Structure",
+
+  "evaluation_criteria": [
+    "Verify primary datum constrains 3 degrees of freedom (DOF) with a stable, planar surface.",
+    "Verify secondary datum constrains 2 DOF perpendicular to primary datum.",
+    "Verify tertiary datum constrains final DOF, fully locking rotational/translation ambiguity.",
+    "Verify datum features chosen on the drawing correspond to functionally significant surfaces or features.",
+    "Verify datum references in feature control frames match the actual manufacturing and inspection setup."
+  ],
+
+  "user_questions": [
+    "What is the primary datum feature (A)?",
+    "What is the secondary datum feature (B)?",
+    "What is the tertiary datum feature (C)?",
+    "Are the datums planar, cylindrical, or irregular functional surfaces?",
+    "Do the referenced datums correctly stabilize all 6 DOF for inspection?"
+  ],
+
+  "expected_answers": [
+    "Primary datum must be a large, stable surface that establishes orientation—commonly a major mounting face.",
+    "Secondary datum typically locks rotation and translation orthogonal to datum A.",
+    "Tertiary datum removes final rotational ambiguity—often an edge, pin, or hole.",
+    "Cylindrical datums require axis extraction; planar datums require best-fit plane alignment.",
+    "A valid datum scheme must constrain all 6 DOF: 3 translational + 3 rotational."
+  ],
+
+  "pass_fail_logic": {
+    "primary_datum_check": "FAIL if primary datum lacks stability or does not constrain 3 DOF.",
+    "secondary_datum_check": "FAIL if secondary datum does not constrain 2 DOF perpendicular to primary.",
+    "tertiary_datum_check": "FAIL if tertiary datum fails to constrain final DOF.",
+    "functional_relevance_check": "FAIL if datum surfaces are not functionally meaningful.",
+    "inspection_setup_check": "FAIL if datum references in FCF cannot be practically fixtured for inspection."
+  },
+
+  "image_features_needed": [
+    "Detect datum feature symbols (A, B, C).",
+    "Identify planar, cylindrical, or complex surfaces associated with each datum.",
+    "Extract axes, center planes, or best-fit surfaces from geometry.",
+    "Evaluate fixture orientation needed to constrain all DOF.",
+    "Verify consistency between geometry, datum tags, and FCF requirements."
+  ]
+}
+
+
+
+
+
+
+