I have a "X" axis table that moves through 3 linkages to follow a big cam. There's a 7/8" dia. hard pin on the last linkage that actually moves the table by pushing and pulling it back and forth. I have a steel block 3" long x 1-1/2" wide x 1-1/2" thick that has a 7/8" bore on one end that fits on the pin and a cam follower on the other end that pushes the table. The block has two 3/8" set screws that locks it to the pin. If the table jams due to a operator mistake or such, the hard pin will slip on the set screws in the block. This prevents damage elsewhere. Irresistible force + immovable object = $$$$. This happens a couple of time a month. I'm worried that the set screws are going to tear-up the hard pin or the set screws will be too tight or not tight enough.
Ideally, there exists something like a bearing or clutch that would be locked-up until some force of say 100 ft-lbs. is applied then it would slip. Anything like that on the shelf?