Thingiverse
Poor Man's 4th Axis cnc
by ZenziWerken
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In order to give tires of my model cars a final touch I was thinking of using a 4th axis for rotary engraving. For the vague idea, the intense investment and due to harsh software requirement it did not get a professional 4th axis set. It came in handy that I had a stepper motor (I changed from my y-axis) and a small chuck laying around. So I designed the *pm4a*.
This build was done on a desktop cnc-machine by [Stepcraft](https://www.zenziwerken.de/my-cnc) from 6.5 mm birch plywood for the body and some 5 mm Pertinax for the gears using a 1.2 mm spiral toothed flute. Furthermore I used
* 2 Ballbearings Type 6000ZZ (10 x 26 x 8 mm)
* 1 Ballbearing Type 608ZZ (8 x 22 x 7 mm)
* small chuck (10 mm 3/8'' x 24 UNF) with SDS-Plus-adapter
* NEMA17 stepper
* a sharpened M8 machine screw and a selflocking nut (for the tailstock)
* some M3 machine screws
The two gears have an pretty uncommon cycloidal (round) teeth, which helped me to create smaller teeth, because they don't have any
This build was done on a desktop cnc-machine by [Stepcraft](https://www.zenziwerken.de/my-cnc) from 6.5 mm birch plywood for the body and some 5 mm Pertinax for the gears using a 1.2 mm spiral toothed flute. Furthermore I used
* 2 Ballbearings Type 6000ZZ (10 x 26 x 8 mm)
* 1 Ballbearing Type 608ZZ (8 x 22 x 7 mm)
* small chuck (10 mm 3/8'' x 24 UNF) with SDS-Plus-adapter
* NEMA17 stepper
* a sharpened M8 machine screw and a selflocking nut (for the tailstock)
* some M3 machine screws
The two gears have an pretty uncommon cycloidal (round) teeth, which helped me to create smaller teeth, because they don't have any
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