Bended ballscrews. What i can do?

[Jonathan]

Personally I'd have a go at straightening them. Whilst the machine will probably 'work' with bent screws, the life of the system (particularly the ballnut) will clearly be lower. How much lower is hard to say, but why take that chance? It's a similar reason for why you shouldn't exceed the critical speed of the screw - whilst sometimes it can look OK as the nut guides the screw, it's still putting larger than normal radial forces on the nut which the nut isn't designed to tolerate.

I straightened a RM1204 ballscrew a while ago. It wasn't challenging.

often this can be done in a standard vice with pair of V blocks. It doesn't take much effort to straighten screws just a little patience.!

Just remember not to use steel V-blocks as you could damage the threads on the screw.