I want to mount a printed part to a standard 2mm motor axis which doesn’t have any dents or profile. Its just round. If I print at exactly 2mm, it fits for the first few times until it gets too lose and the spinning part sometimes falls off.

  • wildbus8979English
    4·
    3 months ago

    2mm is obviously too small for a grub screw. You’re going to need a brass adapter or glue. Either way, it’s probably not coming off (easily) when it’s on there.

  • papalonian@lemmy.worldEnglish
    2·
    3 months ago

    Instead of making the hole the exact size, make a small gap so you can use a screw and nut to clamp it down on the peg

    • Linsensuppe@feddit.orgOPEnglish
      2·
      3 months ago

      But doesn’t that create an offset weight? My part will probably spin at several thousand RPM.

      • EmilieEvans@lemmy.mlEnglish
        3·
        3 months ago

        What is the plastic of your choice?

        PLA, PETG, … behave like a very slowly flowing liquid as such the print will deform/expand (creep).

          • EmilieEvans@lemmy.mlEnglish
            1·
            3 months ago

            For production parts look at other materials. Nylon might still be within the range of your 3D-printer.

            For attaching: If you can’t clamp then look at gluing it in place. If you need it detachable maybe drill a hole in the shaft and use a R-clip.

            You can also tap and die the shaft on top. Make sure to use a left or right-handed thread depending on the rotation/load (thread is so that the rotation/force isn’t unscrewing it).

  • IMALlama@lemmy.worldEnglish
    2·
    3 months ago

    That you’re looking for is called a flange mount. If you search your favorite search engine with “2mm flange mount” you’ll find some results. I do wonder how much torque you’ll be able to transfer, but given the shaft size I suspect you’re not looking at big loads.

  • zinge@lemmy.worldEnglish
    2·
    3 months ago

    Sand a flat to create a D profile and then use a shaft collar and set screw