40 lines
1.6 KiB
Plaintext
40 lines
1.6 KiB
Plaintext
// Cycloidal Gear
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// A cycloidal gear is a gear with a continuous, curved tooth profile. They are used in watchmaking and high precision robotics actuation
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// Set units
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@settings(defaultLengthUnit = in)
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// Create a function for the cycloidal gear
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fn cycloidalGear(gearPitch, gearHeight, holeDiameter, helixAngle: number(deg)) {
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// Create a function to draw the gear profile as a sketch. Rotate each profile about the gear's axis by an helix angle proportional to the total gear height
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fn gearSketch(gHeight) {
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helixAngleP = helixAngle * gHeight / gearHeight
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gearProfile = startSketchOn(offsetPlane(XY, offset = gHeight))
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|> startProfile(at = [
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gearPitch * 1.55 * cos(helixAngleP) + gearPitch * sin(-helixAngleP),
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gearPitch * 1.55 * sin(helixAngleP) + gearPitch * cos(-helixAngleP)
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])
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|> arc(angleStart = 90 + helixAngleP, angleEnd = -90 + helixAngleP, radius = gearPitch)
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|> tangentialArc(radius = gearPitch * 1.67, angle = 60)
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|> tangentialArc(radius = gearPitch, angle = -180)
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|> tangentialArc(radius = gearPitch * 1.67, angle = 60)
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|> tangentialArc(radius = gearPitch, angle = -180)
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|> tangentialArc(endAbsolute = [profileStartX(%), profileStartY(%)])
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|> close(%)
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|> subtract2d(tool = circle(center = [0, 0], radius = holeDiameter / 2))
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return gearProfile
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}
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// Draw sketches of the gear profile along the gear height and loft them together
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gearLoft = loft([
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gearSketch(0),
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gearSketch(gearHeight / 2),
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gearSketch(gearHeight)
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])
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return gearLoft
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}
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// Call the cycloidal gear function
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cycloidalGear(.3, 1.5, 0.297, -80)
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