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  1. #1
    Join Date
    Sep 2009

    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,
    Ps. I will post some photos soon of my machine

  2. #2
    Community Moderator ger21's Avatar
    Join Date
    Mar 2003
    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.

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  3. #3
    Join Date
    May 2008
    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.

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