Broken ball screw

[anemachinebc]

We had a ball screw snap off at the coupler between the servo motor and the screw itself. Has anyone had this happen to them before? This machine wasnt crashed, it just broke while it was running a program.

I just love HAAS machines.







Thanks
Adam

If HAAS made a plane would you fly in it?

[Geof]

Do you have pictures of the broken ends? My guess is that this would be a fatigue fracture and I am interested to see what the initiation point was for the crack.

[samhyto]

Wow, like geof siad, would love to see pictures of the crack? Sounds like it was just a defective ball screw?

But.....there could be some other underlying issues.

Which axis, since the Z is always doing alot of changes of inertia, and there is alot of mass in the head?

Is it a SS machine, these have faster pitch screws?

Has the operator noticed higher than usual loads on the effected axis recently?

How old is the machine as well?

Sam

[asuratman]

It happened to me also, it's broken inside the coupling. I made beveled cut on ballscrew and bar. Re-welded and machined. It works OK. But I do not know how strong. Maybe you just try, better than you throw it. If it broken in the screw, just cut and machine. The, use it for another purpose. Thanks.