Page 2 of 2 FirstFirst 12
  1. #11
    Quote Originally Posted by Ross77 View Post

    ....turn down a threaded bar with bearings on each end and the last section tuned to 6.35mm so you can use a flexi coupler to the motor.
    The problem with a bearing on both ends of the threaded rod is one of access...I need to get my hands in/out a lot (to wind the copper wire on to the main bobbin etc)...this is why if you look at my last photo (of my 'loosely lashed together up' design), I supported the threaded rod a few centimetres in from the end of the rod with a small bearing ....that keeps everything nice & clear/open for ease of access (& it's also easier to thread the copper wire under an open ended bit of threaded rod)
    Last edited by HankMcSpank; 17-04-2013 at 12:29 PM.

  2. #12
    The problem with a bearing on both ends of the threaded rod is one of access...
    The bearings don't have to be at the very ends. You just need the shaft constrained by two bearings to keep it concentric, then the flexible coupling can do it's job and take out any minor alignment problems. keep the arrangement you have but add another support plate and bearing after the coupling, as you have it at the moment the threaded bar will pivot about the middle bearing and exaggerate any alignment issues.

    Have you thought about using a hex bolt and cutting the head off? that way the shank could act as a shaft for the bearings and having a solid round end would be better for forcing on a under sized flex mount.
    Last edited by Ross77; 17-04-2013 at 06:36 PM. Reason: schpellin

Page 2 of 2 FirstFirst 12

Similar Threads

  1. Replies: 4
    Last Post: 02-01-2015, 07:32 AM
  2. pulley fit on motor shaft - force it on?
    By dsc in forum Belt Drive, Pulleys & Timing
    Replies: 2
    Last Post: 09-08-2013, 05:11 AM
  3. dc motor - spindle / shaft drive
    By dsc in forum Spindles & Drive Motors
    Replies: 21
    Last Post: 01-06-2013, 09:42 AM
  4. Threaded bar, steper motor and a plasma cutter.. your thoughts?
    By gr8fun in forum Gantry/Router Machines & Building
    Replies: 8
    Last Post: 27-11-2012, 04:14 PM
  5. Simple Solution- Drive 1" Ball Screw Shaft with NEMA-23-Size Stepper Motor Shaft
    By LoveLearn in forum Gantry/Router Machines & Building
    Replies: 5
    Last Post: 08-02-2012, 12:52 AM


Posting Permissions

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