RC19 Cycloidal Reducer 19:1 for NEMA 17
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Printable 19:1 cycloidal gearbox for NEMA 17 steppers: twin balanced discs, 6 output pins, 6803 bearings.
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- Creative Commons — Attribution — Noncommercial — NoDerivatives
Printable 19:1 cycloidal gearbox for NEMA 17 steppers: twin balanced discs, 6 output pins, 6803 bearings.
19:1 reduction: 20 fixed rollers, 19-lobe cycloidal discs
Two discs at 180° so the unit is balanced and vibration-free
6 steel pins take the slow rotation out through the output flange
Estimated allowable output torque 2.66 N·m with safety factor 2 (analytical estimate, not a load test)
Housing Ø100 mm, bolts straight onto a NEMA 17
Parts to buy
Buy: 2 × 6803 bearings (17×26×5), 26 steel dowel pins Ø6×20 (ISO 8734: 20 rollers + 6 output pins), 10 × M3 brass heat-set inserts (6 for the cover, 4 on the output flange), 4 × M3 screws for the motor and 6 × M3 for the cover.
Print settings
Print 1 housing, 2 discs, 1 eccentric, 1 output, 1 cover. A1 mini, 0.20 mm: about 2 h 55 min and 82 g in total. PETG or PLA+ recommended for the discs and eccentric. No supports.
About this design
Designed in code (OpenSCAD / build123d). Checked for overhangs and bed fit, and sliced in Bambu Studio before release. Pictures are 3D renders. Makes and feedback welcome.
Español
Reductor cicloidal 19:1 imprimible para motor NEMA 17, con dos discos a 180° y seis pasadores de salida. Par admisible estimado 2,66 N·m (cálculo, no ensayo). Unas 2 h 55 min y 82 g en total.
العربية
مخفض سرعة دائري (سيكلويدي) بنسبة 19:1 قابل للطباعة لمحرك NEMA 17، بقرصين متوازنين وستة مسامير للخرج.