text stringlengths 17 190 | explanation stringlengths 33 306 | context stringlengths 21 78 | reasoning_type stringclasses 20
values | potential_prompt_type stringclasses 83
values | practice_type stringclasses 2
values | guideline_type stringclasses 5
values | process_type stringclasses 7
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Use filleted internal corners in pockets; sharp corners require secondary EDM or hand work. | End mills leave a radius; designing for that radius avoids expensive secondary operations. | Internal Corners | CNC Machining | Corner | Rule-based | Geometry Fix | good | DFM | CNC_Machining | geometry | slots |
Align bend lines in the same direction where possible to minimize setups. | Reduces handling and simplifies tooling. | Bend Planning | Sheet Metal | Bend | Strategy-based | Process Planning | good | DFM | Sheet_Metal | material | general |
Over-designing parts with unnecessary curves or tight tolerances significantly increases machining cost without improving function. | Excessive detail forces smaller tools, more setups, and complex toolpaths. Recognizing which geometric details serve real performance needs prevents wasted time and cost. | Machining Efficiency | CNC Machining | Geometry / Machining | Rule-based | Informational | bad | DFM | CNC_Machining | tolerance | general |
Is access restricted during assembly? | This checklist item prompts engineers to consider manufacturability, cost efficiency, and reliability in early design. Addressing it prevents downstream issues during assembly, testing, or production. | Packaging | General Manufacturing | Assembly / Ergonomics | Checklist | Ask-Back | good | DFA | Assembly | assembly | general |
Small features may be allowed, but the diameter in any region should not be less than 0.030 in. (0.76mm). | Potential DFM concern; verify against context. | Feature Size | CNC Turning | Small Feature | Rule-based | Heuristic Suggestion | good | DFM | CNC_Machining | other | general |
Is the noise level unacceptable? | This checklist item prompts engineers to consider manufacturability, cost efficiency, and reliability in early design. Addressing it prevents downstream issues during assembly, testing, or production. | Packaging | General Manufacturing | General DFM | Checklist | Ask-Back | good | Other | Assembly | assembly | general |
Clearly differentiate between reference dimensions and toleranced dimensions using parentheses or drawing conventions. | Reference dimensions should not drive inspection or machining; clarity prevents misuse. | Reference Dims | General | Dimension | Rule-based | Drawing Hygiene | good | Other | CNC_Machining | tolerance | general |
Are there packaging materials that are considered standard that are not being used? | Using standard materials aligns with existing supplier capabilities and ensures availability and cost efficiency. It also facilitates easier replacement and compliance with company or industry standards. | Packaging | General Manufacturing | Material Selection | Checklist | Ask-Back | good | Other | General | material | general |
Bends ± 1 degree | Missing tolerance can cause rework and fit issues. | Tolerances | Sheet Metal | Bend | Rule-based | Ask-Back | good | GD&T | Sheet_Metal | tolerance | general |
“Future DFM tools will predict manufacturing yield and generate optimized designs automatically.” | Suggest integrating predictive yield estimation into the workflow. | AI-driven DFM | Smart Manufacturing | System | Conceptual | Educational Prompt | good | DFM | General | other | general |
Don’t fake dimensions or holes — always model what’s real. | Mismatched models and drawings create manufacturing errors and loss of trust. | Design Accuracy | Machining / Assembly | Geometry | Rule-based | Informational | bad | DFA | CNC_Machining | other | holes |
The most common tolerance standards ... are defined by ISO 2768 and ISO 286. | Missing tolerance can cause rework and fit issues. | Tolerances | CNC Machining | General | Fact | Ask-Back | good | GD&T | CNC_Machining | tolerance | general |
Reduce total part count by combining functions when feasible. | Each additional part increases assembly time, inventory, and potential failure points. | Assembly Simplification | Assembly / Joining | Assembly Efficiency | Strategy-based | Ask-Back | good | DFA | Assembly | assembly | general |
Can multiple parts be combined into one to reduce the number of parts in the assembly? | Combining multiple parts into one simplifies the assembly process and reduces potential failure points. It also improves structural integrity and reduces costs associated with fasteners and assembly labor. | Product Design - General | General Manufacturing | Assembly / Ergonomics | Checklist | Ask-Back | good | DFA | Assembly | assembly | fasteners |
Avoid sharp, zero-radius bends; if a sharp appearance is needed, use post-machining or chamfering. | Sharp bends concentrate stress and can crack, especially in stainless and high-strength alloys. | Sheet Metal - Sharp Bends | Sheet Metal | Bend | Material-Limit-Based | Warning | good | DFM | Sheet_Metal | material | fillets_chamfers |
Align features with main machining axes to reduce repositioning. | Axis alignment minimizes fixture setups and improves tolerance control. | Machining Orientation | CNC Machining | Orientation | Strategy-based | Ask-Back | good | DFM | CNC_Machining | tolerance | general |
Select datum features that represent real functional mating surfaces, not arbitrary model edges. | Functional datums ensure that tolerances relate directly to how the part assembles and works. | Datums | General | Datum | Principle-based | Drawing Check | good | GD&T | General | tolerance | general |
Are there any parts that can be confused with other parts of similar shape? | This checklist item prompts engineers to consider manufacturability, cost efficiency, and reliability in early design. Addressing it prevents downstream issues during assembly, testing, or production. | Product Design - General | General Manufacturing | Assembly / Ergonomics | Checklist | Ask-Back | good | DFA | Assembly | assembly | general |
Use casting for complex forms that are costly to machine. | Casting simplifies manufacturing of complex geometries in fewer steps. | Process Selection | Casting | Process | Strategy-based | Ask-Back | good | DFM | Forming_Casting | cost | general |
Integrate datum features for alignment during inspection and assembly. | Reference datums enable consistent measurement and precise mating. | Quality Control | QA / Assembly | Datum | Principle-based | Ask-Back | good | GD&T | Assembly | assembly | general |
Design with standard sheet thicknesses/gauges instead of custom values. | Standard gauges are cheaper and widely available; custom thickness increases lead time and cost. | Sheet Metal - Standard Gauges | Sheet Metal | Wall | Cost-based | Auto-Suggest | good | DFM | Sheet_Metal | cost | general |
Choose mono-material assemblies to simplify recycling and end-of-life separation. | Using similar material types eliminates complex disassembly steps and supports circular economy goals. | Sustainability | Sustainable Design | Material Lifecycle | Principle-based | Ask-Back | good | DFA | Assembly | assembly | general |
Model clearances for snap fits and joints that account for printer tolerance (e.g., 0.2–0.4 mm gaps). | Perfectly mating solids in CAD may fuse in print; designed clearance is required for moving parts. | 3D Printing - Clearance | FDM 3D Printing | Joint | Empirical | Auto-Suggest | good | DFM | 3D_Printing | tolerance | general |
Use interlocking features to avoid separate fasteners in assembly. | Interlocks improve precision and simplify assembly without screws. | Assembly Design | Assembly | Interlock | Strategy-based | Informational | good | DFA | Assembly | assembly | fasteners |
Can parts be combined for multiple uses? | Combining multiple parts into one simplifies the assembly process and reduces potential failure points. It also improves structural integrity and reduces costs associated with fasteners and assembly labor. | Packaging | General Manufacturing | Assembly / Ergonomics | Checklist | Ask-Back | good | DFA | Assembly | assembly | fasteners |
Maintain sufficient radius at the base of bosses and ribs to avoid stress hot spots. | Fillets spread out stress and improve flow into these junctions. | Injection Molding - Boss/Rib Fillets | Injection Molding | Boss/Rib | Mechanics-based | Auto-Suggest | good | DFM | Forming_Casting | geometry | ribs |
Does master carton not use the optimum retail package arrangement for pallet, blank size and cube efficiency? | Optimizing packaging structure reduces material use, labor time, and shipping costs. It also enhances product protection, ease of unpacking, and consumer experience. | Packaging | General Manufacturing | Packaging / Handling | Checklist | Ask-Back | good | Other | General | material | general |
Keep bridges relatively short; for long spans, add intermediate support or change the geometry. | Long bridges can droop, causing poor surface quality and dimensional error. | 3D Printing - Bridges | FDM 3D Printing | Bridge | Physical Limitation | Diagnostic | good | DFM | 3D_Printing | process | general |
Aerospace applications demand balancing weight optimization with manufacturability. | Ultra-light designs often push tolerance limits. Awareness of manufacturing constraints ensures feasible production. | Industry-Specific DFM | Aerospace Manufacturing | Material / Structural | Conceptual | Informational | good | DFM | General | tolerance | general |
Keep slot widths ≥ tool diameter (often at least 1–2 mm) so they can be machined with standard end mills. | Slots narrower than the tool cannot be machined and require special micro tooling. | CNC - Slot Width | CNC Machining | Slot | Manufacturing Constraint | Auto-Suggest | good | DFM | CNC_Machining | process | slots |
Ensure adequate draft and clearance on slide features if undercuts cannot be eliminated. | Slides need room to move and clear the plastic; poor design causes sticking or damage. | Injection Molding - Slides | Injection Molding | Slide | Manufacturing Constraint | Diagnostic | good | DFM | Forming_Casting | tolerance | general |
Simplify fillet count—uniform radii reduce CAM tool changes. | Uniformity allows reusing same cutter, improving process flow. | Machining Optimization | CNC Machining | Fillet | Rule-based | Informational | good | DFM | CNC_Machining | process | fillets_chamfers |
Avoid pockets deeper than 3× tool diameter to reduce chatter and tool breakage. | Deep, narrow pockets cause chatter and tool deflection, making machining slow and inaccurate. | CNC - Pocket Depth | CNC Machining | Pocket | Physical Limitation | Auto-Suggest | good | DFM | CNC_Machining | process | slots |
AI suggestions must include confidence levels and assumptions to be trusted in engineering workflows. | Engineers need transparency to evaluate manufacturability advice. | AI Explainability | General | Assistant | Principle-based | AI Trust | good | Other | General | material | general |
Datums establish a frame of reference for measurement. | Without datums, measurements are ambiguous. | Datums | GD&T | Datum | Principle-based | Educational Prompt | good | GD&T | General | other | general |
Use joints that permit welding in the flat position when possible. | Flat positions produce higher quality and productivity. | Weld Position | Welding | Joint | Heuristic | Heuristic Suggestion | good | Other | General | assembly | general |
Do not rely on very tiny engraved text; keep stroke widths and character heights comfortably above tool diameters. | Very fine text requires micro tools, which are slow and fragile. | CNC - Engraving | CNC Machining | Text | Manufacturing Constraint | Warning | good | DFM | CNC_Machining | process | general |
Are there parts design that do not allow for proper location and alignment? | This checklist item prompts engineers to consider manufacturability, cost efficiency, and reliability in early design. Addressing it prevents downstream issues during assembly, testing, or production. | Product Design - General | General Manufacturing | Assembly / Ergonomics | Checklist | Ask-Back | good | DFA | Assembly | assembly | general |
Are there concerns with the comfort and the safety of the seating compartment? | Evaluating potential safety hazards early in design prevents injury and ensures compliance with safety standards. It also reduces liability and promotes user trust. | Packaging | General Manufacturing | Assembly / Ergonomics | Checklist | Ask-Back | good | DFA | General | other | general |
Avoid extremely thin roofs over large cavities; add ribs or increase thickness. | Thin horizontal surfaces over voids may sag or show severe drooping between supports. | 3D Printing - Roof Thickness | FDM 3D Printing | Wall | Structural | Diagnostic | good | DFM | 3D_Printing | process | ribs |
Check model sanity before fabrication ‚ basic DFM rules can prevent avoidable errors. | Potential DFM concern; verify against context. | Design Verification | General DFM | Model | Checklist-based | Heuristic Suggestion | good | DFM | General | other | general |
Snap-fit joints are a very simple, economical and rapid way of joining two parts without fasteners or tools. | Potential DFM concern; verify against context. | Snap-Fits | Injection Molding | Snap-fit | Fact | Heuristic Suggestion | good | DFM | Forming_Casting | tolerance | fasteners |
List datums in feature control frames in the order of how the part is functionally located in the assembly. | Datum order should reflect physical assembly and inspection setup, not arbitrary coordinate axes. | Datum Precedence | Assembly | Datum | Principle-based | Design Intent Prompt | good | GD&T | Assembly | assembly | general |
Ask for help if you’re stuck — don’t waste hours on simple modeling issues. | Teams move faster when designers seek guidance early instead of guessing. | Collaboration | CAD | Communication | Principle-based | Ask-Back | good | Other | General | other | general |
Use LMC for features that protect minimum material conditions such as wall thickness or clearance. | LMC is useful where excess material could block flow, clearance, or access even if size is within limits. | Material Condition | Machining | Feature of Size | Principle-based | Design Check | good | DFM | CNC_Machining | tolerance | general |
Align CAD design choices with the intended process (molding, casting, forging). | Process-aware design ensures cost-effective manufacturability and quality consistency. | DFM Integration | General Manufacturing | Process Fit | Principle-based | Ask-Back | good | DFM | Forming_Casting | cost | general |
Keep thread lengths to what is structurally needed; excessive thread depth wastes machining time. | Beyond a certain engagement length, additional threads add little strength but add cost. | Threads | CNC Machining | Thread | Heuristic | Cost Optimization | bad | DFM | CNC_Machining | cost | threads |
Do any parts or assemblies require a special environment during manufacturing? (i.e. dust proofing, grounding, etc.) | This checklist item prompts engineers to consider manufacturability, cost efficiency, and reliability in early design. Addressing it prevents downstream issues during assembly, testing, or production. | Product Design - General | General Manufacturing | Assembly / Ergonomics | Checklist | Ask-Back | good | DFA | Assembly | assembly | fillets_chamfers |
“Move DFM to the front of the process and use automated tools to handle complexity.” | Verify that manufacturability checks are run before design freeze. | Early DFM Integration | PCB Manufacturing | Process | Strategy-based | Checklist | good | DFM | General | other | general |
In injection molding, keep nominal wall thickness as uniform as possible throughout the part. | Non-uniform walls cool unevenly, causing warpage, sink marks, and residual stresses. | Wall Uniformity | Injection Molding | Wall | Principle-based | Warp Analysis | good | DFM | Forming_Casting | geometry | general |
The nominal distance between fasteners is 4D. | Potential DFM concern; verify against context. | Fastener Spacing | Assembly/Fastening | Pattern | Rule-based | Heuristic Suggestion | good | DFA | Assembly | assembly | spacing |
Common design practice is to use a nominal edge distance of 2D from the fastener hole centerline. | Potential DFM concern; verify against context. | Edge Distance | Assembly/Fastening | Hole | Rule-based | Heuristic Suggestion | good | DFA | Assembly | assembly | holes |
How to model and verify a countersink in your CAD design | Non-standard angles may not match fasteners. | Countersink | Sheet Metal | Educational | Direct Check | good | DFM | Sheet_Metal | assembly | fasteners |
Are there opportunities for more cost-effective components? (i.e. speaker size, cheaper PCB, battery quantity, etc.) | Managing wire harness complexity and PCB design ensures efficient assembly and maintenance. Clear labeling and color coding minimize wiring errors and improve serviceability. | Product Design - General | General Manufacturing | Electronics / Wiring | Checklist | Ask-Back | good | Other | Assembly | assembly | general |
Include 1–2° of draft on core and cavity surfaces in molded parts. | Draft improves ejection and reduces drag marks. This rule is often taught explicitly in sophomore-level manufacturing courses. | Draft | Injection Molding | Rule-based | Teaching Prompt | good | DFM | Forming_Casting | geometry | general |
Use consistent internal fillet radii throughout the part to reduce tool changes and machining cost. | Standardizing radii lets the shop use fewer tools and shorter programs. | CNC - Standardization | CNC Machining | Fillet | Cost-based | Auto-Suggest | good | DFM | CNC_Machining | cost | fillets_chamfers |
Multiple surfaces ± 0.030 in. | Missing tolerance can cause rework and fit issues. | Tolerances | Sheet Metal | General | Rule-based | Ask-Back | good | GD&T | Sheet_Metal | tolerance | general |
The maximum depth of holes we recommend is 4 x the nominal diameter. | Deep holes risk tool deflection and poor chip evacuation. | Hole Depth | CNC Milling | Hole | Rule-based | Direct Check | good | DFM | CNC_Machining | other | holes |
Apply perpendicularity to features that must be square to a datum, such as mounting faces. | Perpendicularity creates a tolerance zone around a theoretical 90° orientation, aiding assembly fit. | Perpendicularity | Machining | Surface | Rule-based | Design Check | good | GD&T | CNC_Machining | tolerance | fillets_chamfers |
Avoid placing ejector pins on cosmetic or sealing surfaces whenever possible. | Ejector marks on visible or sealing areas can cause appearance issues and leaks. | Ejection | Injection Molding | Surface | Principle-based | DFM Warning | bad | DFM | Forming_Casting | material | general |
Use positional tolerances for hole patterns instead of tight linear dimensions. | Position controls functional fit with looser individual dims. | GD&T | Machining | Hole Pattern | Principle-based | Tolerance Optimization | good | GD&T | CNC_Machining | tolerance | holes |
Smooth coatings can prevent gasket adhesion; slight surface texture often improves bonding. | Adhesion relies on mechanical grip as well as chemistry. Over-polished surfaces reduce wetting and cause delamination. | Surface Preparation | FIP Dispensing | Surface Finish | Heuristic | Informational | good | Other | General | assembly | general |
Avoid excessive draft angles that distort part geometry. | Too much draft changes fit and can affect structural or aesthetic alignment. | Draft Optimization | Molding | Draft Angle | Heuristic | Informational | bad | DFM | Forming_Casting | tolerance | general |
Avoid aspect ratios of height to diameter > 3:1 for unsupported bosses in CNC milling. | Tall slender bosses vibrate and are easily damaged. | Bosses | CNC Machining | Boss | Heuristic | Stability Check | bad | DFM | CNC_Machining | process | bosses |
Add lead-in chamfers at tapped holes to guide screws and reduce cross-threading. | Chamfers improve assembly ergonomics and protect thread starts from damage. | Lead-In | CNC Machining | Edge | Heuristic | Assembly Aid | good | DFM | CNC_Machining | assembly | holes |
Are there parts that do not nest properly? | This checklist item prompts engineers to consider manufacturability, cost efficiency, and reliability in early design. Addressing it prevents downstream issues during assembly, testing, or production. | Product Design - General | General Manufacturing | Assembly / Ergonomics | Checklist | Ask-Back | good | DFA | Assembly | assembly | general |
Select materials with adequate machinability ratings for the chosen manufacturing process. | Poor machinability increases tool wear and cycle time. | Material Selection | CNC Machining | Material | Principle-based | Material Check | good | DFM | CNC_Machining | material | general |
Design bosses for screws with supporting ribs rather than solid thick cylinders. | Reduces sink while preserving strength around screws. | Bosses | Injection Molding | Boss | Principle-based | Feature Optimization | good | DFM | Forming_Casting | assembly | ribs |
The distance between two ribs should be 2 ‚ 3X the nominal wall thickness. | Thick ribs cause sink and warpage. | Ribs Spacing | Injection Molding | Rib | Rule-based | Direct Check | good | DFM | Forming_Casting | geometry | spacing |
Use relief cuts at the ends of complex bend intersections to reduce tearing. | Relief prevents material from stretching and cracking. | Relief Cuts | Sheet Metal | Relief | Heuristic | Detail Check | good | DFM | Sheet_Metal | material | general |
Review CAD models with manufacturing partners before final release. | Early joint reviews catch design flaws before they reach the shop floor, saving cost and lead time. | Collaboration | General | Review Process | Principle-based | Ask-Back | good | Other | General | assembly | general |
Avoid thin walls less than two extrusion widths in FDM printing. | Too-thin walls are fragile and may not slice correctly. | Wall Thickness | Additive | Wall | Fact | Feature Validation | bad | DFM | 3D_Printing | process | general |
Protolabs provides a range of internal bend radius tooling options between 0.01 in. and 1 in. | Potential DFM concern; verify against context. | Bend Radius Tooling | Sheet Metal | Bend | Capability | Heuristic Suggestion | good | DFM | Sheet_Metal | material | general |
The radius of the corner will be half the diameter of the cutting tool. | Potential DFM concern; verify against context. | Internal Corners | CNC Milling | Corner | Rule-based | Heuristic Suggestion | good | DFM | CNC_Machining | geometry | general |
Blind holes machined with a drill have a conical floor (135o angle). | Potential DFM concern; verify against context. | Drilled Holes | CNC Milling | Hole | Fact | Heuristic Suggestion | good | DFM | CNC_Machining | other | holes |
Minimize the number of separate adjustment points in a mechanism; design for fixed, repeatable alignment. | Fewer adjustments mean fewer opportunities for misalignment during assembly or service. | Adjustments | Assembly | Mechanism | Principle-based | Reliability Prompt | good | DFA | Assembly | assembly | general |
Use profile to control both size and location of non-cylindrical bosses or tabs instead of complex coordinate schemes. | Profile simplifies specification of non-standard shapes and improves inspection clarity. | Profile | Machining | Boss | Principle-based | Geometry Control | good | DFM | CNC_Machining | material | bosses |
Critical features should remain accessible to standard metrology tools to prevent custom gauge development. | Deep cavities or blind holes require specialized probes. Designing with access in mind saves time and equipment cost. | Inspection Design | General Manufacturing | QA / Accessibility | Rule-based | Ask-Back | good | Other | General | cost | holes |
Minimize secondary operations like polishing, trimming, or drilling. | Each post-process adds labor and tolerance variation. Integrating finish quality into the initial process improves yield. | Process Optimization | Multi-Process | Manufacturing Operations | Strategy-based | Informational | good | Other | Multi_Process | tolerance | holes |
Choose machining tolerances around ±0.005" unless tighter is required. | Industry-standard tolerances balance cost with precision. | Machining Standards | CNC Machining | Tolerance | Rule-based | Informational | good | DFM | CNC_Machining | tolerance | fillets_chamfers |
Use texture-friendly draft and avoid small, deep recesses that are hard to polish. | Recessed or undercut surfaces are hard to polish or texture, raising tooling cost. | Injection Molding - Surface Finish | Injection Molding | Surface | Manufacturing Constraint | Auto-Suggest | good | DFM | Forming_Casting | surface_finish | general |
“Ensure cross-functional collaboration between design, engineering, and manufacturing.” | Confirm multi-disciplinary review sign-offs before release. | Team Integration | General Manufacturing | Process | Principle-based | Ask-Back | good | Other | General | other | general |
Avoid specifying unnecessarily tight tolerances (e.g., ±0.01 mm) on non-critical dimensions. | Tighter tolerances require slower machining, inspection, and sometimes secondary operations. | CNC - Tolerancing | CNC Machining | General | Cost-based | Diagnostic | good | DFM | CNC_Machining | tolerance | general |
A +/- 1 degree tolerance on all bend angles is generally acceptable in the industry. | Potential DFM concern; verify against context. | Bend Angles | Sheet Metal | Bend | Rule-based | Heuristic Suggestion | good | DFM | Sheet_Metal | tolerance | general |
Can product components be easily detached or damaged by consumer? | This checklist item prompts engineers to consider manufacturability, cost efficiency, and reliability in early design. Addressing it prevents downstream issues during assembly, testing, or production. | Packaging | General Manufacturing | General DFM | Checklist | Ask-Back | good | Other | Assembly | assembly | general |
Avoid abrupt wall thickness transitions; use tapers or fillets to blend. | Smooth transitions reduce stress and cosmetic defects. This rule is often taught explicitly in sophomore-level manufacturing courses. | Wall Transitions | Injection Molding | Wall | Principle-based | Teaching Prompt | good | DFM | Forming_Casting | geometry | threads |
chatbots may miss nuanced design reasoning ‚ physical intuition and edge cases matter. | Preference-based; confirm desired level of automation. | Limitations | /Software | Assistant | Conceptual | Ask-Back | bad | Other | General | other | general |
Radiused corners are required, and must be larger than the cutter to be used. | Potential DFM concern; verify against context. | Internal Corners | CNC Milling | Corner | Rule-based | Heuristic Suggestion | good | DFM | CNC_Machining | geometry | general |
Use standardized components and tools wherever possible. | Off-the-shelf fasteners, bearings, or switches reduce lead time and ensure replaceability. | Standardization | Assembly / Machining | Parts / Procurement | Rule-based | Informational | good | DFA | CNC_Machining | assembly | fasteners |
Can the product be secured in a less labor intensive method? | This checklist item prompts engineers to consider manufacturability, cost efficiency, and reliability in early design. Addressing it prevents downstream issues during assembly, testing, or production. | Packaging | General Manufacturing | General DFM | Checklist | Ask-Back | good | Other | Assembly | assembly | general |
Keep minimum flange length at least 4× material thickness to allow proper contact with tooling. | Short flanges don’t engage the press brake die properly and may deform or slip. | Sheet Metal - Flange Length | Sheet Metal | Flange | Manufacturing Constraint | Auto-Suggest | good | DFM | Sheet_Metal | material | general |
Avoid designs that require many side actions or lifters; simplify to straight-pull molds where possible. | Side actions and lifters add cost, complexity, and risk of mechanical failure in the mold. | Injection Molding - Undercuts | Injection Molding | Undercut | Cost-based | Warning | good | DFM | Forming_Casting | cost | general |
Verify accessibility for cutters and inspection probes in all orientations. | Poor access increases cycle time or may make features unmachinable. | Accessibility | Machining | Reachability | Rule-based | Ask-Back | good | DFM | CNC_Machining | other | general |
Holes and slots should be at least 6X MT from each other. | Potential DFM concern; verify against context. | Feature Spacing | Sheet Metal | Hole/Slot | Rule-based | Heuristic Suggestion | good | DFM | Sheet_Metal | geometry | holes |
Reduce undercuts and overhangs that require special tooling. | Side actions and custom tools add setup and maintenance time. | Tooling Complexity | Molding / Machining | Undercut | Rule-based | Informational | bad | DFM | CNC_Machining | geometry | general |
Ensure proper dimensioning in cast parts to prevent shrinkage issues. | Poor dimension control leads to porosity or misalignment in castings. | Casting Design | Casting | Dimensioning | Rule-based | Informational | good | DFM | Forming_Casting | process | general |
Avoid chain dimensioning for critical features; dimension from common datums instead. | Chain dimensions accumulate tolerance stack-up; datum-based dimensions localize variation. | Dimensioning | General | Dimension | Rule-based | DFM Warning | bad | GD&T | General | tolerance | general |
Are there any mechanisms of the product that may not meet life-cycle requirement? | Simplifying complex mechanisms improves reliability and reduces the risk of assembly errors or part failure. It enhances manufacturability and minimizes maintenance or repair time. | Packaging | General Manufacturing | General DFM | Checklist | Ask-Back | good | Other | Assembly | assembly | general |
Can irregular parting lines be eliminated? | This checklist item prompts engineers to consider manufacturability, cost efficiency, and reliability in early design. Addressing it prevents downstream issues during assembly, testing, or production. | Product Design - General | General Manufacturing | Assembly / Ergonomics | Checklist | Ask-Back | good | DFA | Assembly | assembly | general |
Are there any missing surface finishes/textures? | This checklist item prompts engineers to consider manufacturability, cost efficiency, and reliability in early design. Addressing it prevents downstream issues during assembly, testing, or production. | Product Design - General | General Manufacturing | General DFM | Checklist | Ask-Back | good | Other | Assembly | assembly | general |
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