1. #1
    Hi, I've seen a nice design for an z axis using a R&P instead of a ballscrew. I suppose i've been looking at an R&P because its potentially cheaper. I'm mostly cutting foam and light density board and hoping for a fairly deep z axis.

    Has anyone got a good example of R&P used for an z axis and is there any reason why not to use this system over others.

    Thanks

  2. #2
    R&P is not really a good candicate for a Z axis due to the low resolution and low efficiency compared to a ballscrew.

    For it to work and have anywhere near decent resolution then it will need gearing, obviously this ratio depends on the pinion diameter but from experience expect at least 6:1 to be even close to a ballscrew resolution.
    By the time you have bought rack, pinion, 2 x pulleys, 1 x belt and then messed around with bearings and plates etc to make work then it's no longer cheap.
    Then you have the CRAP factor.? . . . Z axis gets showerd with all the shit from the cutter and this gets into the Rack and can Jam and cause sticking and missed steps Etc.

    A ballscrew from China complete with bearing blocks will workout about the same and bolt straight on with no messing and honestly R&P doesn't compare in performance and smoothness terms. R&P is notchy and clunky in comparison and on Z axis this is the last thing you want.

    Stay clear is my Advise.!!

Similar Threads

  1. Rack & Pinion Gearbox/Gearing
    By andrewbond in forum Rack & Pinion Systems
    Replies: 21
    Last Post: 12-09-2015, 09:10 AM
  2. 6m X axis Rack and pinion or belt drive?
    By charlieuk in forum Rack & Pinion Systems
    Replies: 4
    Last Post: 07-11-2013, 03:59 PM
  3. Rack and Pinion MOD 1 & MOD 2 diffrence
    By D-man in forum Rack & Pinion Systems
    Replies: 2
    Last Post: 07-11-2012, 03:29 PM
  4. Rack and Pinion
    By pmcb1011 in forum Rack & Pinion Systems
    Replies: 3
    Last Post: 31-05-2011, 11:55 AM
  5. Headsup for the Hemsworthlad! Rack and Pinion
    By Smiler in forum Rack & Pinion Systems
    Replies: 4
    Last Post: 14-06-2009, 11:36 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
  •