Results 1 to 2 of 2

Thread: PRT Y-Rails

  1. #1
    Join Date
    Sep 2014
    Location
    Poughkeepsie, NY
    Posts
    28

    Default PRT Y-Rails

    Looking for help adjusting my y-rails. Ordered new rails with from Shopbot with the hardenend v-rails already installed. My problem is- rail ends not parallel, shimmed both ends, good to go. All four v-wheels sit perfect. As I roll the carriage across the y, the two closest wheels (x0,y0) ride across perfect. On the far side, I get one wheel that rides up on the rail. I tried shimming the wheels, track, ect. All it does is move what wheel rides up the rail. I'm thinking there is a small bend in the new rails? Any suggestions?

  2. #2
    Join Date
    Apr 2007
    Location
    Marquette, MI
    Posts
    3,388

    Default

    Assuming the Y rails are in fact perfectly parallel, a wheel "riding up" is a result of the 2 Y rails not being orthogonal, i.e., not in the same plane. Which can result from the X rails being in the same condition, which twists the X car. With the Y car removed, this is usually visible to the trained eye.

    When setup properly, you cant believe how smooth one of these old machines runs on the hardened rails.
    Gary Campbell
    GCnC Control
    GCnC411(at)gmail(dot)com
    Servo Controller Upgrades
    http://www.youtube.com/user/Islaww1


    "We can not solve our problems with the same level of thinking that created them"
    Albert Einstein


Similar Threads

  1. X rails
    By sawkerf in forum ShopBotter Message Board
    Replies: 0
    Last Post: 07-15-2014, 11:56 PM
  2. New rails
    By sawkerf in forum ShopBotter Message Board
    Replies: 5
    Last Post: 10-14-2010, 11:56 AM
  3. BWC rails
    By ljdm in forum Archives2008
    Replies: 4
    Last Post: 10-06-2008, 09:14 AM
  4. How far are the rails apart?
    By knight_toolworks in forum Archives2007
    Replies: 4
    Last Post: 04-04-2007, 10:59 PM
  5. X rails
    By Dan B. (Unregistered Guest) in forum Archives2004
    Replies: 6
    Last Post: 03-29-2004, 01:54 PM

Posting Permissions

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