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Thread: what do you use for universal joints?

  1. Re: what do you use for universal joints?

    tician -

    For delta robots like (http://bit.ly/ZCeFUu) I don't have to worry about the 3rd degree so I'm looking seriously at some magnetic ball joints (http://bit.ly/19DK6li). Don't know what kind of wear they'll go through. I'm looking for the best possible price - in my simplest robot I use 12 units, in the next model up I use 16.

    For Stewart Platforms I'm looking for smooth-bore with set-screw. M4 might do. Thingiverse has http://www.thingiverse.com/thing:3140. I found these (http://bit.ly/19DKrEG). I haven't tried either yet. I'm looking for a better price as I'd rather buy off the shelf than manufacture. Until I can afford to manufacture I'm forced to stick with using ready-made parts.

    I'm also comparing note to see what anyone else found.

  2. #12

    Re: what do you use for universal joints?

    Those look like a great option!

  3. #13

    Re: what do you use for universal joints?

    Quote Originally Posted by jwatte View Post
    Btw: Those igus joints are what I would call "ball joints" -- they look like they have three degrees of freedom. A "universal joint" is a joint with two degrees of freedom (see illustration.) And if someone has a good bead on a supply of those other than scavenging from RC car axle linkages, I'd be interested in hearing about it :-)
    Yes, you are totally right. I guess it was a bit too early in the morning when I wrote that reply.

    Quote Originally Posted by aggrav8d View Post
    tician -

    For Stewart Platforms I'm looking for smooth-bore with set-screw. M4 might do. Thingiverse has http://www.thingiverse.com/thing:3140. I found these (http://bit.ly/19DKrEG). I haven't tried either yet. I'm looking for a better price as I'd rather buy off the shelf than manufacture. Until I can afford to manufacture I'm forced to stick with using ready-made parts.
    Myself, I usually get these kind of things at RC hobby (web) stores. As like your second link. They usually do have quite some margin for themselves, so if you want to go bulk better find a supplier for the more professional crowd.

    You can also try here: https://sdp-si.com/eStore/CoverPg/UJoints.htm

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