Hi -
I had PC look at an 89x router motor that generates so much heat it's hard to handle the bit afterward. He didn't know what the problem was (and hadn't seen the problem before). He called today and said he had another in with a different problem but being curious ran it on the bench like he did with mine and saw the same excessive heat generated in the mainshaft. He suspects an armature clearance problem. My motor and this one are about 30,000 units apart so it seems this heating problem isn't new. I've had a 690 for years that never even warmed the bit in the least.
So I have two questions for the group, assuming there must be others here with this motor and that I'm not the only with this 'problem':
- Does ANYONE with this motor NOT see excessive heat?
- How do those with the heat change bits when they're really too hot to handle?
I'm a design engineer and I find it incomprehensible that PC would knowingly design a motor generating so much heat the collet/bit can't be handled without gloves but more importantly the metal fatigue of parts rotating at 23k RPM with this kind of sustained heat seems just plain dangerous (not to mention the danger of wood dust/high heat).
I'm just trying to understand how come the couple times I've posted no one has said they do or do not see this kind of heat in this particular motor? Although I think this motor is only a year old, PC routers are too popular for me to be the only one in the group with one.
Mike