You got me curious. I have the Craftsman (Bosch made) version of the 1617 EVSPK, which I've had for almost 2 years, but has had limited use. I ran it full throttle for 1 minute (without bit), and afterward I could barely detect any difference in temperature on the shaft, collet and bearing cover. I don't have a temperature sensor, but I would say it wasn't more than a couple degrees warmer then the housing, which wasn't even warm. I would suggest taking it to a Bosch service center and get their opinion.
Tom
Tom

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