Re: CNC Servo motor gear ratio: overheating...perplexing

Hmmm,

I have been following this thread with great interest. I originally
posted on the overheating servo motors. After reading thru the
thread, It makes me think I maybe need to adjust gain and be sure
there is no dithering with an oscope. Also, maybe if I limit the
output current with the limit adjust.

I did let the X axis sit with no movement, and it did not get hot,
so I dont think its dithering a lot. It does occassionally chirp
and oscillate a bit back and forth.

My mill is MUCH smaller than the one shown on the website, although
my motors are smaller too. BUT, not that much smaller. I thought
the motors would actually be oversized.

One other item is that my motors are about 3500 rpm motors, and the
ones shown on the mill/drill photo are rated at about 900rpm
(i believe). That probably makes a big difference. Maybe I should
get some of the 900rpm motors. I think I saw them at CandHSales.com
Thx
Eric


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "deanc500"
<deancouillard@s...> wrote:

> Have you taken any heavy/long/slow cuts to make sure they won't

overheat

> ?
>
>
> Yes, I have let the machine run for several hours at a time, and

made

> a point of periodically checking the motor temperature. They do get

a

> few degrees above ambient but nothing serious at all.
> Dean