We are trying to decide what the best (retention knob) pull stud pressure would be on a CAT-50 holder for a 30hp CNC Machine.
The current machine spindle recommends 4500lbs. but we are contemplating designing new spindles with rates as high as 8-10,000 lbs. to solve some taper wear issues?
I have a 1"-8 thread with a 110 ft.lbs. max. torque spec. This seems quite sufficient if the threads were always dry. However, between the the application is contantly contaminated by oil, in takes about 150 ft.lbs. to get the same results, a formula or lab test backed data sheet would be nice...
I have CAT-50 tool holders that have a 1"-8 thread pull stud with a 110 ft.lbs. max. torque spec. This seems quite sufficient if the threads were always dry. However, between the spindle oil and the oil in the coolant, in takes about 150 ft.lbs. to get the same results, a formula or lab test...
We have some 50-taper machines (SNK-machines with in-spec 3500lbs. of pull pressure) that have habitually collected pitting and wear on the holder taper.
It has resulted in regular spindle taper regrinding.
We have been recently evaluating the run-out condition of our holders with a proper...
We are finding that PM is harder (but more brittle) which makes it last longer.
Need to know some specifics on comparing the actual structure and manufacturing of each.
Average Hardness / Tensile comparison?
THere seems to be a shortage of PM?
