Re: How hot is too hot?

I think my steppers are rated for 85 deg C as max or possibly
operating temperature.

that is about 180 deg F not enough to boil a drop of water, but
much hotter than your hand would be happy to be near.

Dave



--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Lloyd Leung" <lloyd@l...>
wrote:

> 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@w...> [mailto:jeff@w...]
> 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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