Trying to figure out why the spindle on my 1013 is running hot. Background information is that I purchased a used machine that had a damaged spindle. Got a new motor spindle assemble from Oliver and identical bearing. I have yet to run a carving, but figure it would be inviting a meltdown to ignore the hot spindle issue. My understanding is that the bearing stabilizes the spindle against lateral force. the spindle slips into the bearing and the motor is then secured to the z-axis assemble. the mounting holes on the motor are a little over sized to allow the motor to move around a small amount to align the spindle in the bearing. Once the best alignment is found(least heat and noise) would mean the best position. I lightly clamped down the motor screws and ran the machine and made small repositioning in the motor to minimize noise and vibration, yet the spindle still got warm after a min or two . My concern is real world use would be really hot. Wondering if it would be better to apply loctite to the inner bearing and spindle to prevent slippage here. Ideas? what do you all note about your spindle temp?
What rpm are you operating at? What is the temp that you believe is too hot? The alignment of the motor to the spindle is important, the method you mentioned to use to align them would not seem to produce any accurate results, is there a better way to do this? Misalignment will produce heat. If you can answer some of these questions I would be happy to try and help to find a solution, you are right in be concerened about spindle bearing heat, a tell tale sign that something is wrong.
Not really surprising, the spindle motor is set up for single speed running and what you are trying to improve by going slow is the quality of the cut. So changing the x axis speed is what gives the bit more time to cut cleanly, not changing the speed of the bit.