Pneumatic stepper motor: T-8

With a size of 8 x 8 x 5.5 mm and a 0.2 mm step size this motor is the smallest 3-D printable pneumatic stepper motor. The cylinder cross-section is only 2.5 mm square. Print a few spare pistons, if you drop one on the floor then you may not be able to find it back.

Video: https://youtu.be/BBG-8ZSOmdY?t=95

It is essential to print it in the highest possible resolution in order to make the triangular teeth as sharp as possible. If you get sine-wave shaped teeth instead then it may not work.

Print instructions

Print on a high-resolution 3D printer, e.g. Stratasys Objet260 Connex3 in HQ mode.

Laser-cut seals from 0.5 mm silicone rubber. The cylinder cross-section measures 2.5 mm x 2.5 mm so the seals should be approx 2.6 mm x 2.6 mm. Experiment with cutting dimensions for the optimal tradeoff between good airtightness and low friction.

For advanced users only. If you are new to pneumatic stepper motors then start with a bigger one such as the T-84.

Please let me know when you print this thing. Enjoy the miniature stepper motor!