Close

First 'motorized' test / demo

A project log for 3D Printed Ballscrew Linear Actuator

Developing a cheap DIY alternative to expensive machined ballscrew actuators (with a little less precision). For humanoid robots.

AnthroboticsAnthrobotics 05/22/2020 at 03:260 Comments

Here is the first test/demo of the actuator using a power drill. While we await new ESCs for driving brushless motors, this will suffice for now!

The stroke of the actuator is a bit wobbly, partly attributed to an uneven print surface. This was due to the print being performed horizontally, using support on one of the sides. The Wanhao i3 had a bit of trouble with layer separation the higher a print goes, so we will be leaving the printing of tall parts to our new delta printer.

Smooth Side

Coarse Side

Also, the nut containing the ball bearings was not completely full, which may have resulted in some added backlash. This can be fixed by filling the nut completely with BBs.

The improved motor coupler allows for secure attachment to the thread of the ballscrew, as well as easy fixation via set screw to the motor shaft. The coupler can be easily swapped based on the desired motor shaft size.

Motor Coupler

Overall, not too bad for a first prototype! We are looking forward to an improved second print, with some added features including endstop switches, and proper motorization.

Discussions