Re: [CAD_CAM_EDM_DRO] Re: servo vs stepper

jeffdavis516 wrote:

> Thanks Tim,
>
> I kind of knew you would have the answer. Another question for you.
> How do you know where your running a motor?

You have to have specs from the manufacturer.

> I could be running the
> servo at the continuous place, or I could be somewhere in between the
> continuous and peak? I know that when I run my jobs on the mill the
> motors remain cool to the touch.

Then, you aren't even getting close to the continuous rating point.

> I have not ever felt them even
> warm. This has always baffled me, every motor that I have used
> before (AC only) has gotten warm to the touch after use.

If you run it hard enough, it WILL get warm. But, you might have to
have it running one foot back and forth as fast as it can, over and over,
to see this. It is the acceleration peaks that get the current up.
Otherwise, the motors draw practically no current, therefore, no
heat. (I have LED bar graphs on my servo amps, X and Y idle
at no current, and the Z just has tiny blips as it is always playing
with the quill's weight.

Jon