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Marcus,
I need this machine to be reliable so i am probably going to buy the Auto Tech router type 3 phase water cooled spindle to have on hand in case the current motor fails. If i can get them to sell me the smaller motor with the kit i will definitely get it just for insurance.

I like the original motor especially its quietness. I think it failed because the wiring was marginal and i overloaded it for too long. I had just increased the feed rates incrementally and did not notice any bogging down so i thought it was all fine. Wood is a bitch, i really prefer machining metal. Wood varies from one piece to the next in grain and density. What probably happened is that the cutter wore a little and i was running it for too long not noticing that the motor was overheating a little. When it gets hot, it loses power so it slows down, the cutting suffers and the load increases even more and then the weak point breaks. The brush wires had melted. I think that with new wires soldered to the brush holders and with care to not let it overheat, it might be fine.

Is there any point in putting aluminum heat sinks on the motor with heat conductive epoxy? The stepper motors (that never overheat) have clamped on heat sinks. Wter cooling would be more work but i can do that when i get back to my real shop.

Does anyone know if spare parts are available for the Baumuller motor. I would like to get new brush holders and the original brushes. Also one cap broke and is currently epoxied together.

I can not find my tachometer (but will look a little more) so i have no idea what is going on other than by the noise it makes. I am using a very nice little KBIC solid state DC motor speed control. It has IR compensation that keeps the speed constant with varying load. I do not know the details as to how this works. When the load increases it does not slow down so it might be giving me a false sense that all is well when it is jacking the mean voltage up to keep it going and causing the motor to overheat?

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Hi Spencer

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Is your spindle rpm correct for the size of cutter, number of flutes, depth of cut, feed rate and you are using a sharp cutter??

If you can answer yes to all of the above and the motor overheats it is probably doing too much work.

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I am not into woodworking so don't know power required for your application.

You could try reducing the feed rate to give the motor less work.

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Perhaps you can partly enclose the motor casing/end plate and use a fan to force cooling air over the motor body.

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Rgds, Marcus

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Best regards, Spencer Chase
67550-Bell Springs Rd.
Garberville, CA 95542 Postal service only.
Laytonville, CA 95454 UPS only.
Spencer@...

(425) 791-0309