RE: [CAD_CAM_EDM_DRO] Encoder/Servo question

Hi Bill

I can give a practical example...
My ballscrew lead and encoder combination gives 0.0001"
per encoder pulse. When I do a series of 0.0001" moves
it usually takes two or three before there is actual movement,
and the reported position error is about the same...0.0003" or so.
I can get even closer by adding more integral gain, but stability
would suffer for high speed high acceleration motion.

So that is about 1/700 turn of the ballscrew.

Les

Leslie M.Watts
L M Watts Furniture
Tiger Georgia

Main page:
http://www.lmwatts.com
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-----Original Message-----
From: Bill Vance [mailto:ccq@...]
Sent: Friday, July 16, 2004 5:35 AM
To: 2cc@...
Subject: [CAD_CAM_EDM_DRO] Encoder/Servo question


Howdy;

I've noted various references to 1000 and 2000 line encoders, but are there
any
servos that will actually turn one or two thousandths of a turn per
step/line?

Bill