OpenSCAD Hypocycloid gearbox generator

thingiverse

UPDATE: Successfully configured scad file (v1.31) to produce casing and other components for NEMA 17 motor. Actually put this configuration to the test and was pleased with results, despite experiencing slight irregularity in motion transfer, likely caused by inconsistencies in print quality. The gearbox had to be broken in with a small amount of autosol before operating properly, after which the autosol could be removed. Have also successfully printed casing using both PLA and ABS, applying acetone vapor to ABS-printed model for finishing. Find it difficult to determine whether PLA or ABS offers better performance; however, the PLA model proved more reliable in the end. NOTE: Printing with ABS led to considerable shrinkage, resulting in delamination of casing corners from print bed on my Replicator 2 clone. Important Notes Regarding Parameter Testing Testing has only been performed for NEMA17 motor up until now, so don't anticipate perfect results when attempting this with different parameters. Still a work in progress for a university project I'm involved with. Instructions for Completing the Model Provided The model complete as it is will necessitate: M6 threaded shaft approximately 60 to 70 mm diameter Multiple M6 nuts used to join output ring to shaft, as well as two 6mm ID bearings (19 mm OD) Two 10 mm ID, 15 mm OD bearings utilized in the sun assembly for cam fitment. Small self-tapping screws, approximate size unsure but minute, necessary for combining the sun assembly M3, 30 mm cap screws to secure gearbox to motor. Approximate number needed is four. At least four M3, 10 mm screw and nut sets necessary to hold the top part of casing together Unprinted components yet. Observed with my printer that approximately half a nozzle diameter additional material exists in every print job; a 10 mm cylinder produced will measure 10.4 mm due to this phenomenon on my printer, which has a 0.4 mm nozzle. To mitigate this issue, the 'Clearence' variable can be adjusted (in scad file) for half or more of nozzle diameter. Achieved gear ratio of pegs^2 - 1: 1 is. Should be achievable with about 70mm gearbox in 1:625 with dimensions say of, approximately 15 to 20 mm height, presently designing a housing to be able to put it through rigorous testing.