Re: [CAD_CAM_EDM_DRO] How hot is too hot?

If you can keep your hand on it without discomfort, it's probably below
135° F. Most big stepper motors have insulation that allows 50° C. rise
ABOVE 40° C. anbient. That's a sizzlin' 194° F. After 2 1/2 hrs hard
running, the temp has most likely stabilized, so, I'd say you're more than
safe where you're at. Have you got your controls working yet?

RayHex

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> From: washcomp <jeff@...>
>
> I've increased the voltage on the power supply feeding my NEMA 42
> steppers to about 67 volts DC which is well under the 25 X voltage
> limit. I've been warned that at too high a voltage the motors get
> hot enough to fry eggs (a quantitative measurement, but one thats
> hard for me to test without a pan.
>
> After about 2 1/2 hours of locked rotor testing the motor is pretty
> warm towards hot, but I can keep my hand on it without discomfort.