RE: [CAD_CAM_EDM_DRO] Threading on a lathe with EMC

I don't understand what you mean by "servoed in position".

Ethan


-----Original Message-----
From: ccs@... [SMTP:ccs@...]
Sent: Monday, October 29, 2001 1:05 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Threading on a lathe with EMC

> Is the problem that the hobby machines do not have a proper spindle encoder?

No, as hobbyists we should all be capable of fitting one. The problem
is that the architecture of EMC will need some adaptation to be able
to coordinate other axis moves to an encoder on a spindle that cannot
be servoed in position. So your choices are servo the spindle with a
positioning-class drive or modify the innermost workings of EMC.

To some extent, the problem may be that those doing development don't
have lathes with spindle encoders. Most of the development work has
been mill-oriented.

> Has anyone done a feed per revolution for EMC?

Not of the sort that is needed for threading on a lathe. There exist
CNC codes to turn such a mode on and off, but there is no program code
to slave an axis to the spindle revolution.

Chris


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