Protection split bushing

Often in precision assembly (especially in gauging) we need to secure metrology equipment or precision components (which often disassembled) by means of a set screw direct clamping. This kind of clamping (tightening directly with a screw) causes surface deformation, burs and craters. The problem is that precision component will not operate properly under deformation and may need to be reused in a different gauge configuration. Imagine the clamping surface of a component after several times reassembling. Disaster, the expensive component is useless.
The solution is to use a protection split bushing which is inserted between the component clamping surface and the corresponding hole. Instead of damaging the surface of high cost equipment, we use this economic and easy to make protection split bushing.

The material of the ring depends on application; we can use an aluminum alloy, carbon steel or a stainless steel. The bushing length must be equal or larger than precision component mating hole. The tolerance of the ring’s hole depends on mating surface’s tolerance. A small clearance (transition fit) is permitted in order to have a strong clamping. The outside diameter of the ring should have a clearance fit (rolling fit).