Re: [CAD_CAM_EDM_DRO] Re: 3 axis home and limit switches

One note on switches. In CNCpro, and I would assume for Mach1 at some point,
you can put the limit switches in parallel for each axis.

The program knows which direction that it is going. By doing this it will
know which limit switch it has been hit.

Bob Campbell

----- Original Message -----
From: "caudlet" <tom@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, December 03, 2002 2:21 PM
Subject: [CAD_CAM_EDM_DRO] Re: 3 axis home and limit switches


> --- In CAD_CAM_EDM_DRO@y..., "res0clvs" <rob.will@v...> wrote:
> > Caudlet:
> > There are five input pins... how do you connect nine switches to
> these five
>
> Some packages (MACH1) will allow you to define a second parallel port
> (cheap add-in card) as well.
>
> You need to have X+ X-; Y+ Y-; Z+ Z- and optionally seperate home
> switches on each axis. You can use the limits as Home to save pin
> counts or you may want to just have home on the X & Y. Using
> individual switches the software should allow you to run to a limit
> then job away from the limit rather than just shutting down the
> machine. Of course you can always make the case that if you are
> running a program and it runs to a limit it might as well stop
> everything since something is wrong! I find that being able to jog
> to a limit then do an offset has some advantages.
>
> In the "If-You-Feel-Lucky" category: Use -limits (closest to 0,0,0)
> only and define them as "home". Uses three pins and you have two
> left for other inputs. One more idea. Do the three -limits and tie
> the + limits in series over to a pin defined as e-stop. Sort of a
> compromise.
>
> I have been running my small engraving table with no limits but it
> doesn't move that quickly and I watch every cut. The big 5' X 5'
> table currently under construction that will have 160 to 200 IPM
> rapids is another story and WILL have limits everywhere!
>
>
> 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 group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>