BALL SCREW REPAIR
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Question:
We had a bad collision on one of our turning centers, a long boring bar indexed into the chuck. The turret was damaged and knocked out of alignment and a jaw was broken off the chuck. We repaired these parts but now we have over 0.100" backlash in the 'x' axis ballscrew. How could the backlash be so much yet the ballscrew still function?

Answer:
Unfortunately for turning center owners this is not an unusual occurrence. It is possible for one of these machines, especially the more powerful models, to almost destroy themselves when they take a bad hit. Because of this, all parts that absorb the force of a collision are likely to be damaged to some extent. Because you have so much backlash it is unlikely for all to be in the ball screw itself. Most of the backlash you are experiencing is probably in the locknuts securing the thrust bearings. When the force of the collision is toward the centerline of the machine it stresses these locknuts, partially stripping the threads. If this is the cause of your problem it is still recommended that you have the ball screw checked by a professional.

Express Ball Screw Repair

112 Price Cir.
Ringgold, GA. 30736

Phone: (423) 559-2153
Fax: (423) 559-1044
E-mail:  expressballscrew@aol.com


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