It's a CAT40 1985 Cincinnati with 6000rpm maximum speed, and the service manual says to tighten the pull stud on the end of the tool holders to 25ft/lbs. Doesn't mention any thread locking compound.
So I tried it for two cycles, and it worked great. Much much better finish and less runout than before at 65ft/lbs.
But, is 25ft/lbs reliable? Torque should be transferred through those squares on the spindle face if the chuck rotates at all in the spindle, but will 25ft/lbs vibrate loose after a few roughing cycles in aluminum? It just seems like 25 is far too weak.
So I tried it for two cycles, and it worked great. Much much better finish and less runout than before at 65ft/lbs.
But, is 25ft/lbs reliable? Torque should be transferred through those squares on the spindle face if the chuck rotates at all in the spindle, but will 25ft/lbs vibrate loose after a few roughing cycles in aluminum? It just seems like 25 is far too weak.