Does anyone know if there are any better upgrade bearings I can put in the spindle head and motor so that I can use the 6000rpm capability of the belt drive without the head getting that hot?
I thought about taking out the bearings, cleaning, and repacking them, but they appear to be sealed bearings. Something else that I noticed is that after the belt conversion the motor doesn't seem to draw in as much air as it used to, which I think is the main contributor to the heat issue. When I put the smaller of the two pulleys that I made on the motor it runs cooler, most likely because there is more room around the pulley for air to be pulled into the motor. It got me to wondering if it would be possible to make another pulley with a series of holes drilled through it, that would help draw air and force it into the motor.
Chris
> Jeff, an old "Bull of the Woods" machinist pointed this out to me years
> back. He would walk through the shop and lightly touch each motor on
> machines in use. If he could leave his hand on the motor then it was not
> working hard and neither was the machinist! Motors are (were) rated to
> run at 30 degrees above ambient. In a 68 degree shop that's a warm 98
> degrees and in a 90 degree shop (like I recall!) that's 120 and quite
> warm to the touch!
> So if you are working your little motor hard then it should be warm to
> the touch. A non contacting thermometer (~$20 at HF) will tell you
> exactly how hot your motor is and also where the heat/cool is going in
> your house too!
> With luck there is a nameplate on your motor that will give the power
> rating in watts and the temperature rise above ambient! Bill
>
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