512,558 active members
3,724 visitors online
Register for free
Login
Results 1 to 3 of 3
  1. #1
    Registered
    Join Date
    Sep 2009
    Posts
    22

    Straightening Acme lead screw?

    Hi all,
    I have just about finished my first CNC machine and received the Acme screws from the USA today. Both screws (36") have bends in them of about 1/4"- 1/2" over their span. What is the best method i should use to straighten them evenly, and will their accuracy be affected? Or am i just worrying too much?

    Thanks kindly in advance,
    Julian.
    Ps. I will post some photos soon of my machine

  2. #2
    Community Moderator ger21's Avatar
    Join Date
    Mar 2003
    Posts
    34659
    If they don't whip, then you don't need to worry about it.
    Mine were whipping, so I layed them on a flat surface, and rolled them back and forth to find the bends. Then I carefully bent them by hand. They ended up having more smaller bends, but getting rid of the major bends reduced the whipping considerably.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  3. #3
    Registered
    Join Date
    May 2008
    Posts
    1167
    I had to straighten mine and I had good luck putting them on the mill with two v blocks and an indicator in a drill chuck with the 3/8 shaft going through the indicator mount so I could use it as a press.

    I used the quill and the shaft to bend the rod straight after I found the high spots.

    I set the v blocks about 6" apart and turned the rod to find the highest spot and then pressed it a bit with the 3/8 shaft in the drill chuck.

    I was able to get a 1/2" bend down to about .010

    A drill press would also work for this.

    They bend easy so be careful.

Similar Threads

  1. Acme lead screw 1.5 meter up
    By osix in forum Want To Buy...Need help!
    Replies: 0
    Last Post: 04-16-2008, 04:57 PM
  2. Acme Lead Screw Questions
    By Eurisko in forum DIY CNC Router Table Machines
    Replies: 4
    Last Post: 03-26-2007, 11:19 PM
  3. acme lead screw
    By swarfmacdaddy in forum Linear and Rotary Motion
    Replies: 4
    Last Post: 12-11-2005, 02:09 PM
  4. Acme Lead Screw Decision
    By js15 in forum DIY CNC Router Table Machines
    Replies: 0
    Last Post: 07-20-2005, 08:44 PM
  5. acme lead screw article
    By sdwilson in forum DIY CNC Router Table Machines
    Replies: 1
    Last Post: 12-14-2003, 07:33 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
  •