Re: [CAD_CAM_EDM_DRO]next phase on HELP

Chris, Dave

You and Dave are heading in different directions. You are using
steppers and a G201 and Dave is going with servos and a G320
or G340. In his case he will hook up the encoders to the drives and
in your case you need an encoder interface card which plugs into an
open ISA slot on your computer. That can be had from Dan Mauch at
Camtronics or you can roll your own. The schematic is on the web
somewhere, and the chips can be ordered from USDigital. I would
recomend getting EMC running without the encoders first, then,
when and if you decide you are happy with EMC, you can add the
encoders later. You may decide you really don't need them since you
are running a stepper system. Dave on the other hand has no choice,
since he is using servos.

Dave, forgot to mention, Since you are running a plasma table you
may wish to be very careful when shielding the encoder wires as the
plasma torch may generate lots of noise (don't really know if they do,
but it seems like they would) Also did you read the info on the Plasma
Cam website about arc initiation and noise?

Bill

> Dave,
> I am interested in using encoders also - using a Gecko G201 and
> ballscrews that have 3 turn/in and a pinion gear that is 1/2 rotation
> per inch...
> How can I interface this with EMC and my computer system?
> -Chris
>
> Dave,
> I used the E3, the E2 is for shaft sizes up to .394" and
> I have .5" shaft. You may need the -H option which is a
> hole in the cover for the shaft to stick through if it is too
> long. I missed that and had to drill my own hole in the cover.
> If you are using a Gecko, don't be tempted to get too high
> of a resolution as it will require too many steps per second
> from the computer. Depends what your leadscrew lead is.
> I used 500 cpr which works out to 2000 ppr after quadratue.
> multiply that times 5 revs per inch of the screws and you
> can see the numbers climb really high. Get them too high
> and either EMC will choke or it will affect your top speed.
> If youy have one of those gigahertz computers this may
> not be a problem. I am using an AMD 450 with 64 meg
>
> Bill
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> Post messages: CAD_CAM_EDM_DRO@yahoogroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
> Moderator: jmelson@... timg@... [Moderator]
> URL to this page: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> bill,
> List Manager
>
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>
>
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> Post messages: CAD_CAM_EDM_DRO@yahoogroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
> Moderator: jmelson@... timg@... [Moderator]
> URL to this page: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> bill,
> List Manager
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>