View Full Version : Bent ballscrews - is repair possible?

07-12-2013, 12:20 AM
Hi all,

I have two ballscrews on my machine that aren't straight - is it common practice to have that 'repaired' or do people normally buy replacements? I just learned that it's actually possible to straighten them with the right equipment (youtube told me), but is there any place a DIY cnc-er can turn to for such a service? Mine are the 2510 type and quite long so it would cost a lot to replace.


07-12-2013, 08:15 PM
Maybe this type of thing ? the rollers on one side are usually fixed in a straight line while the opposite 3 are adjustable.
Roller straightener - RAVNI Technologies (http://www.ravni.com/Roller-straightener.html)

Something on a smaller scale but demonstrates the idea
Fret Bender ( Home made ) Fret Wire Bender all Radius Adjustable - YouTube (http://www.youtube.com/watch?v=g2ZmxZXKedg)

07-12-2013, 09:58 PM
Thanks. The video that I saw on youtube for straightening ball screws is this one Eitel RP-16 straightening press - ballscrew demo - YouTube (http://www.youtube.com/watch?v=Vg7KHaHd9I4&hd=1) and I was wondering if that sort of service has been used by anyone on this forum. Whether there is such a service, even.

Perhaps I'm only imagining that the wobble in my x-axis ball screws are affecting my work, but something is (affecting my work, that is) and I feel like doing something about it. When my machine was installed we had a terrible time getting it through the door and the ball screws were grabbed ... I know, but it was that or dropping the whole thing. Besides, at the time none of us knew what a ball screw was anyway :-(

That was two years ago and things aren't bad, just not really great.

10-12-2013, 07:38 PM
Just found this, maybe you could get a quote ?

Ballscrew Services - Ballscrew repair and supply of new ballscrews and spindles (http://www.ballscrewservices.co.uk/)

10-12-2013, 08:41 PM
I sent them an email. Taking my machine apart, I found out that one of the ballnuts is all but stuck; it looks corroded on the inside, or at least not nice and shiny. I'm surprised the stepper gets it to move at all. So I have to replace some parts in any case.