Prismatic joints don't seem to be very popular on walking robots so wanted to try them out and find out why. This is a companion discussion topic for the original entry at https://community.robotshop.com/robots/show/prismatic-sliding-joint-robot-leg-test

Hi there @demej00 , Thanks for sharing your project! I saw your initial post which had only the leg. I have to say it’s quite satisfying to see it added on a robot! Haft-Quadruped is a good name for it! :robot::+1:

Thanks Mariane. It is satisfying to see it lift its feet off the floor. It was funny to see the legs walk up onto the carpet but the wheels needed a little assist. I have another leg built and one more to go. Looking forward to have a full quadruped. Programming a walk shouldn’t …

Oh wow! That’s an amazing concept here. The mechanism created by the servo to achieve linear motion is really inspiring.

Thank you pj! I couldn’t afford a linear servo which I thought I could find pretty cheap on taibao.com but no luck. I now have the quadruped working with 4 legs and am playing with gaits. Will post a video when I get something interesting. It looks like a robot using 4 crutches.

Thanks again Mariane. I wish someone with real mechanical skills and equipment would evolve it further. I probably will just tinker with the code a bit and then move on.

Decided to place update here as I don’t like my project to jump to the head of the line when I update it. Have discovered that SG90 servos are really inadequate for operating as the hip joint on my robot - they are floppy and sloppy and the gears loosen up quickly which makes th…

This is so great! do you have any tips?

Thanks! Well I haven’t done much with it lately as I got sidetracked on another project. But I found out that you shouldn’t use the SG90 servos for the hips as the plastic linkage is too floppy - need at least SG92Rs or MG90s. I think someone with some real mechanical skills co…

Is it possible to 3-d print parts? (If you like hat idea, you might want to check out my post) thanks!

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Prismatic (Sliding Joint) Robot Leg Test

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Mariane May 31, 2019, 1:51pm 6

Even more satisfying now! Lovely idea.
Your robot is a good example of how a project can evolve and become greater than it was, even though it was amazing at first.