RE: How hot is too hot?

I've read on this list, that some run theirs hot enough to hold, but you
wouldn't want to hold it there. I think that would be a good limit to stay.


So hot that you can't touch would be a bad thing.

After about 1 hour, 15 minute cycles. My motors are very warm, warm enough
to not want to keep my hand there, but not enough to burn me. They are Nema
34's at 42 volts 2.5 amps.

Cheers.



-----Original Message-----
From: washcomp <jeff@...> [mailto:jeff@...]
Sent: February 24, 2003 11:59 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: How hot is too hot?

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.

Should I be satisfied or concerned?

Regards,
Jeff


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