reittec polisher stepper mod

Update 11/2021:

Added a stronger drive gear, since the normal one failed. For this one you have to get the orientation right. In any case I recommend printing in ABS and checking the screw regularly to prevent coming loose.

Reitec Polisher silent Nema 17 stepper mod

Here is the original:  https://www.thingiverse.com/thing:4076827

Due to the low torque at low rpm, a DC-Motor needs a gearbox for this appliance. This results in the annoying high pitch screeching of cheap gearboxes. Stepper motors on the other hand can have high torque at low rpm due to their greater diameter, multi piece armature and electronic control, making a gearbox obsolete. With no brushes and no gearbox the lifespan of a stepper should be longer as well. Using modern TMC2208 drivers, operation can be very silent.

BOM:
Stepper motor:
Nema 17 (shaft diameter: 5mm and shaft length: 24mm), eg:
https://www.amazon.de/STEPPERONLINE-Schrittmotor-Stepping-4-Draht-Stepper/dp/B07KZQ77VH/
https://www.aliexpress.com/item/1005003283138556.html?spm=a2g0o.productlist.0.0.d428792a0LKWuY&algo\_pvid=eed9a302-c8de-49c5-80e8-dcb087b48f10&algo\_exp\_id=eed9a302-c8de-49c5-80e8-dcb087b48f10-28&pdp\_ext\_f=%7B%22sku\_id%22%3A%2212000025011498859%22%7D

Stepper Controller eg. MKS OSC:
https://www.aliexpress.com/item/33045482410.html
https://www.amazon.de/Motorantriebsregler-beschleunigt-Regelung-Positiv-Rotationssteuerung/dp/B08CDNXP5P/

Cheap stepper driver (not recommended):
https://www.amazon.de/gp/product/B085MYN9VD/
https://www.aliexpress.com/item/33045482410.html

Silent stepper driver BIGTREETECH TMC2208 V3.0 (highly recommended):
https://www.aliexpress.com/item/4001066141499.html?spm=a2g0o.productlist.0.0.1bb227af47AIqA&algo\_pvid=099bb197-7815-4c15-a3d9-8d66ae6ab029&algo\_exp\_id=099bb197-7815-4c15-a3d9-8d66ae6ab029-1&pdp\_ext\_f=%7B%22sku\_id%22%3A%2210000014003424053%22%7D
https://www.amazon.de/PoPprint-Schrittmotortreibermodul-K%C3%BChlk%C3%B6rper-UART-Modus-kompatibel/dp/B07RN6T4LM/?th=1

4x M3x6 Bolts
1x M3x10 Bolt
1x M3 Nut

The stepper controller MKS OSC must be set to frequency mode and middle frequency range (jumpers see picture). For stepper driver increase the current via the potentiometer from low to high until there is enough torque.

I highly recommend the 608 bearing upgrade from Leviathan3D: https://www.thingiverse.com/thing:4100518

Print Settings

Rafts:

No

Supports: 

No

Resolution:

0.2

Filament: material4print ABS How I Designed This

I imported the step file in freecad. The freecad model is attached, in case you need to adjust some stuff. You can get freecad for free here: https://www.freecadweb.org/

I used the drive gear mod from Gunslinger59 to use regular a m3x10 bolt and reduced the diameter for the shaft.

Category: 3D Printing

Modification of the polishing machine from reittec to drive with a stepper motor.