Current bars are 3/4"-10 standard threaded rod and round nuts welded into a steel tube. Ends are just some 1"x"1 steel 6" long welded to the threaded rod. One hole in the middle of the tube for a bar to slip in to turn it.
They work ok but at times when tightening or loosening the pads on the ends start to rotate with the tube. Work is both steel and aluminum so knurling the ends of the pads for grip is out of the question. They need to be smooth as to not mark up the parts.
Thinking if I go to a steel acme threaded rod and a brass or bronze nut press fit into the steel tube ends will help but would like to know if there are more things I can do.
Spreading pressure isn't too much with these, 1-40 ft/lbs on average. Quick calculations put all of the smaller cheaper thrust bearings past the load ratings.
Think swapping from standard to acme threads and the softer nut material will make much of a difference? Prefer dry threads because I grind and weld with them in place on the parts and cleaning the threads gets old fast.
They work ok but at times when tightening or loosening the pads on the ends start to rotate with the tube. Work is both steel and aluminum so knurling the ends of the pads for grip is out of the question. They need to be smooth as to not mark up the parts.
Thinking if I go to a steel acme threaded rod and a brass or bronze nut press fit into the steel tube ends will help but would like to know if there are more things I can do.
Spreading pressure isn't too much with these, 1-40 ft/lbs on average. Quick calculations put all of the smaller cheaper thrust bearings past the load ratings.
Think swapping from standard to acme threads and the softer nut material will make much of a difference? Prefer dry threads because I grind and weld with them in place on the parts and cleaning the threads gets old fast.