| import math |
| import FreeCAD as App |
| import Part |
|
|
| |
| teeth = 18 |
| module = 2.2 |
| thickness = 6.0 |
|
|
| pitch_r = module * teeth / 2.0 |
| tip_r = pitch_r + module * 0.9 |
| root_r = pitch_r - module * 1.1 |
| step = 2.0 * math.pi / teeth |
|
|
| points = [] |
| for i in range(teeth): |
| a = i * step |
| for frac, radius in ( |
| (-0.46, root_r), |
| (-0.40, root_r), |
| (-0.35, root_r + (tip_r - root_r) * 0.30), |
| (-0.28, root_r + (tip_r - root_r) * 0.82), |
| (-0.20, tip_r), |
| (0.20, tip_r), |
| (0.28, root_r + (tip_r - root_r) * 0.82), |
| (0.35, root_r + (tip_r - root_r) * 0.30), |
| (0.40, root_r), |
| (0.46, root_r), |
| ): |
| angle = a + frac * step |
| points.append( |
| App.Vector(math.cos(angle) * radius, math.sin(angle) * radius, 0) |
| ) |
| points.append(points[0]) |
|
|
| profile = Part.Face(Part.makePolygon(points, True)) |
| gear = profile.extrude(App.Vector(0, 0, thickness)) |
|
|
| |
| gear = gear.cut( |
| Part.makeCylinder(4.5, thickness + 2.0, App.Vector(0, 0, -1.0)) |
| ) |
|
|
| |
| for i in range(5): |
| angle = 2.0 * math.pi * i / 5.0 + math.pi / 10.0 |
| centre = App.Vector( |
| math.cos(angle) * pitch_r * 0.62, |
| math.sin(angle) * pitch_r * 0.62, |
| -1.0, |
| ) |
| gear = gear.cut(Part.makeCylinder(2.8, thickness + 2.0, centre)) |
|
|
| plate = Part.show(gear, "GearPlate") |
| plate.ViewObject.ShapeColor = (0.94, 0.68, 0.32) |
|
|
| hub = Part.makeCylinder(6.8, thickness + 3.0, App.Vector(0, 0, -1.5)) |
| hub = hub.cut(Part.makeCylinder(4.15, thickness + 5.0, App.Vector(0, 0, -2.5))) |
| hub_obj = Part.show(hub, "Hub") |
| hub_obj.ViewObject.ShapeColor = (0.27, 0.38, 0.35) |
|
|
