Page 2 of 2 FirstFirst 12
  1. #11
    Quote Originally Posted by m_c View Post
    I think Komatias meant frame size, not torque ;-)
    I would expect a choice between Nema23, 34, and 60/80 servo sizes would cover most bases.

    Until Komatias posted, I was thinking of making some of these, but I won't step on his toes.
    M_C

    You carry on mate, personal circumstances have changed a bit so will probably be a while before I can take this project on now.
    If you need design input or parts sourcing I can help of course.
    https://emvioeng.com
    Machine tools and 3D printing supplies. Expanding constantly.

  2. #12
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 2 Hours Ago Has been a member for 9-10 years. Has a total post count of 2,121. Received thanks 233 times, giving thanks to others 5 times.
    OK, so just ran the figures based on Jonathan's design, and by the time you add up all the parts, you'd be looking a finished cost of over 200 per assembly to make them worthwhile making.
    That would include the main assembly (Alu shaft, 30t pulley, sealed 7207 bearings), motor pulley, and belt.

    However, that's not how I'd personally mount ballnuts , as that's not how they're meant to be mounted.
    The precision surface is the external cylinder of the main nut, which should be contained within a hole, but to mount them that way involves scaling things up a bit, however with a bit of a re-design, it could mean they wouldn't need dismantled to swap belts.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  3. #13
    m_c, Are you suggesting something like the housing shown in this design: http://www.mycncuk.com/threads/3340-...5724#post85724 but with the nut rotated so it sits inside the housing similar to this deisign: https://www.youtube.com/watch?v=4unEngqU09A
    There also a GrabCad link to the design in the Youtube description...

  4. #14
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 2 Hours Ago Has been a member for 9-10 years. Has a total post count of 2,121. Received thanks 233 times, giving thanks to others 5 times.
    Quote Originally Posted by Krammer002 View Post
    m_c, Are you suggesting something like the housing shown in this design: http://www.mycncuk.com/threads/3340-...5724#post85724 but with the nut rotated so it sits inside the housing similar to this deisign: https://www.youtube.com/watch?v=4unEngqU09A
    There also a GrabCad link to the design in the Youtube description...
    Yes.

    That youtube video is interesting, although they must be using an Rxx (cylindrical screw in) type nut, as the 3D file has a locking collar on the rear, which I can only guess is for locking the nut into the shaft.
    Also, they must be relying on the pulley/pulley bolts to preload the bearings, which means you'd have to be very precise with measurements, or rely on shims for adjusting the bearings.

    I need to go and sketch a couple ideas.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

Page 2 of 2 FirstFirst 12

Similar Threads

  1. Rotating Ballnut - design ideas
    By Jonathan in forum Open Source Designs & Plans
    Replies: 174
    Last Post: 15-02-2018, 08:48 AM
  2. Rotating Ball nut
    By drumsticksplinter in forum Lead Screws, Nuts & Supports
    Replies: 27
    Last Post: 28-08-2016, 04:46 PM
  3. Noob Wondering About Rotating Mchinery
    By magicniner in forum General Discussion
    Replies: 11
    Last Post: 26-03-2016, 03:23 PM
  4. Rotating ball nut
    By D-man in forum Projects, Jobs & Requests
    Replies: 0
    Last Post: 21-03-2015, 07:39 AM
  5. Rotating Ballnut Design MK3
    By Jonathan in forum Linear & Rotary Assemblies
    Replies: 0
    Last Post: 15-12-2013, 12:35 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •