As per previous discussion here I started designing a 3D printed robot arm. I’ve been delaying posting a little as I want to do a proper write up with better pictures (and video!) but I decided to post a short preview for now to let people see it.
So far I’ve got a single axis constructed. This will let me test the basic principles before going further. I hope to make this a four axis arm with provisions for a two axis wrist to be added. The arm will be similar dimensions to a human arm and my goal is to use it for manufacturing.
This axis uses a Turnigy SK3 63-74 149kv motor. The gears net a 62.5:1 reduction. Basic torque calculations show that with this reduction you could theoretically lift 10kg at 1 meter. Naturally the arm won’t be that strong (it would break) but this shows that we will be limited by other factors. My design goal is 2kg lift at human arm length.
Edit and fork the design for free on OnShape:
Check it out!