RE: [CAD_CAM_EDM_DRO] How do you compare steppers to servos

>Your micron accuracy is moot,

>thermal expansion/contraction will eat that.

Amen. And don't forget to also factor in tool wear, tool deflection, etc,
etc



Jeff Birt

Soigeneris.com



From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Steve Blackmore
Sent: Friday, February 25, 2011 3:08 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] How do you compare steppers to servos

On Fri, 25 Feb 2011 20:23:16 +0100, you wrote:

>More like 10.000 counts to 300.000 counts.
>They position more accurately, thus they are more accurate.
>Even very basic servos position to well better than 1/1000 of a
>revolution, upto very much better depending on how much you spend, I
>suppose.
>
>Using a servo on a lathe will absolutely deliver more accuracy, to
>about 1 micron levels.
>Whether one can use or need that, depends.
>For me, with lathes, absolutely yes.

I do a lot of CNC turning, steppers have served me well enough.

Your micron accuracy is moot, thermal expansion/contraction will eat
that.

Parts I make are in the +/- 0.005mm tolerance range which is more than
acceptable to my customers

Steve Blackmore
--





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