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:


Question:
Sometimes when we zero the machine axis' at the start of the shift, the 'z' axis mis-positions by what appears to be 0.250". If we repeat the process several times it will finally position correctly. Is this caused by the ballscrew or the servo drive?
Answer:


Question:
We removed the table ball screw from one of our machines but didn't take note of how the bearings were assembled in the housing. There are four bearings and some spacers at one end and two bearings on the other end. We know which bearings belong to which end but we can't seem to assemble them so the machine works like it used to. They are all ball bearings but we are told they are a special type that must be assembled correctly. Can you help us out?
Answer:


Question:
When the slide moves on one axis of our boring mill it vibrates and jumps a little as it moves. Is this a ball screw problem?
Answer:


Question:
While disassembling one of our machines we accidentally wound the ball nut off the ball screw about two or three turns. We managed to get it back on but when we run it the thing locked up. We have tried to free it off but the ball nut just gets tighter. The ballscrew was OK before this happened so it doesn't need to be rebuilt, it just needs freeing off. How can we do this?
Answer:


Question:
We have designed and built a special purpose machine for our manufacturing plant and have used ballscrews on all the slides but we failed to incorporate a means to automatically lubricate the ballscrews. Will it be necessary to add an automatic lube system or can we get away with manually oiling the screws each week?
Answer:

Express Ball Screw Repair

369 Virgil Rymer Road NE.
Cleveland TN 37323

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


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