Re: [CAD_CAM_EDM_DRO] Re: CNC Servo motor gear ratio: overheating...perplexing

Hi etauch;

etauch wrote:

>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.
>

A scope can be very useful when dealling with servo electronics, it is
not manadatory though. Usually a storage scope is the best buy for
such work. The user manuals for your drives may have more information
on their usefullness for a specific drive.

>
>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.
>

That chirp or osscilation will be a big concern. Best to resolve what
is causing that before moving on.

>
>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
>

You need more informaiton on the motor than just that.

>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
>>
>>
>
>
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