Thanks for all the info! First of all, you can see in the pic how I was measuring backlash using a digital caliper. With the assembly in place, I moved the screw in one direction, extended the caliper, and then turned in the opposite direction, watching both the caliper display and the graduated collar on the screw itself.
The screw has bearings only on the handle end and appear to be just two thrust type bearings, the inboard one bearing against a thick washer which, in turn, press against the screw itself.
Can someone explain what type of bearing would be ideal for this operation, etc.?
i agree that I should start first by making sure that any backlash problem stemming from the screw bearing should be eliminated.
Thanks!
Bob |