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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Burke-Millrite (Powermatic) Vertical Mill Spindle Bearing Question
Looking for anyone that has replaced their Timken spindle bearings on a
Burke-Millrite or Powermatic vertical mill. One of the guys in my metalworking club bought this machine, the bearings were noisy, he replaced them and had to press both of them off. He pressed them back on, there is a preload nut just above them which is useless if you have to press the bearings on! Now the bearings have failed again (spindle gets very hot very fast as there is no allowable movement). The spindle looks fine, our suspicion is that the bearings that were on the machine when he got it, might have been incorrect, he merely matched the numbers on them when he replaced them. My guess is that the bearings should be a slip fit to allow for preload. Is our hunch correct? Thanks guys, Marty |
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Have him join the BurkeMills group on yahoo. The Millrite manual in pdf
form is there and it has a section on adjusting the preload. The exploded diagram of the head gives the Timken numbers. Plus, there's a bunch of pretty good guys with Burkes. I changed the group over to a moderated membership a couple of weeks ago to cut down on the spam. -Mike On Tue, 21 Dec 2004 01:47:01 +0000, Marty Escarcega wrote: Looking for anyone that has replaced their Timken spindle bearings on a Burke-Millrite or Powermatic vertical mill. One of the guys in my metalworking club bought this machine, the bearings were noisy, he replaced them and had to press both of them off. He pressed them back on, there is a preload nut just above them which is useless if you have to press the bearings on! Now the bearings have failed again (spindle gets very hot very fast as there is no allowable movement). The spindle looks fine, our suspicion is that the bearings that were on the machine when he got it, might have been incorrect, he merely matched the numbers on them when he replaced them. My guess is that the bearings should be a slip fit to allow for preload. Is our hunch correct? Thanks guys, Marty |
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