Frankly, the stock motor is very poor and the controller so fragile that the spindle and bearings are capable of much higher levels of performance than they meet even with a belt conversion.
I have replaced mine with a 1kW Servo motor and can run the spindle at 8,000rpm without significant heating.
Terry
--- In GrizHFMinimill@yahoogroups.com, gerry waclawiak <gerrywac@...> wrote:
> The bearings should not be getting so hot and I suspect that the pre-load is far too high.
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