Arm with counterweight

Lynxmotion Robot Arms
1

Hello,

I want to build a couple of SES arms. I’ve seen this post: “Sneak Peek of 6 DOF arm w/gripper and weight counterbalance!” and I think this is a great design. The image is this one:

A few questions about it:

  • How is the counterweight connected to the arm? I think it’s a ball bearing hup, an interconnect bracket and a plastic piece that isn’t sold by lynxmotion, correct?
  • How is the ball link at the top connected to the arm? I think it’s via 2 L brackets, but I’m not sure
  • I would like to mount the arm directly on an aluminum channel. What would be the best way to do that given the long C bracket at the base of the arm (the black one)? I don’t want to get rid of it as I think it’s important in order to not have all the weight of the arm on the servo axis. Maybe I could use a low profile axis?
2

The plastic part on the end of the forearm is just a flat piece that connects to the two servo mounting holes. The arrangement works well, but we never made much progress beyond the proof of concept.

3

Thank you for the precisions. Can you explain how the ball link is secured at the elbow level (on top)? Is it 2 L brackets?

What’s the reason for stopping at the proof of concept for this one? It feels more reliable and easier to tweak than the springs.

Vincent

4

Again the plastic part on the end of the forearm is a flat piece of plastic connected to the servo mounting screws. It’s not made with 2 L brackets, but there’s no reason it couldn’t be made that way.

As for not developing this into a full kit. Limitations of time and space, mostly space. But there’s nothing stopping you from building it from the SES parts, and a little good old prototyping. :wink: