Parametric Gear Toy

thingiverse

A parametric gear toy based on the [parametric spur gear](https://www.thingiverse.com/thing:3336641). The four gear teeth counts are adjustable parameters. The default settings yields a gear ratio of approximately 3 from the outside to inside gear. Three M5 threaded thumbscrews keep the gears in place on their shafts. See the [parametric bearing gear toy](https://www.thingiverse.com/thing:3336671) for a bearing based version. This design exposes the following top-level parameters: * `TOP_GEAR1_TEETH` - tooth count of right gear (default 35) * `TOP_GEAR2_TEETH` - tooth count of top middle gear (default 16) * `TOP_GEAR3_TEETH` - tooth count of bottom middle gear (default 33) * `TOP_GEAR4_TEETH` - tooth count of left gear (default 24) * `TOP_GEAR_SHAFT_DIAMETER` - shaft diameter of all gears (default 7.5mm) * `TOP_GEAR_HEIGHT` - height of all gears (default 5mm) * `TOP_GEAR_SCALE` - tooth scaling for process margin (default 0.925) This design addresses material shrinkage and printing accuracy discrepancies in the gear teeth by scaling the gear teeth with the parameter `TOP_GEAR_SCALE`, which ranges from 0.0-1.0 and defaults to 0.925. This parameter scales the width of the gear teeth along their reference diameter, where 1.0 is the nominal width. If you do encounter binding or slop, you can adjust `TOP_GEAR_SCALE` to compensate. GitHub: https://github.com/vsergeev/3d-gear-toy/tree/master/parametric-gear-toy Design on A360: https://a360.co/2QdHual