Re: G92-program zero

["Darrell" <dgehlsen-at-earthlink.net>]

Dave,
Are you dialing in a start position and then in the program using a G92 to set
part zero with out any X/Y/Z moves? Or are you dialing in a known position,
setting that as "Machine Zero" then in the program moving to X/Y/Z position and
then doing G92?
If you are doing it the first way, you have no reference to a known zero so when
you end the program you loose your zero because the machine goes to your unknown
zero point.
Use known points such as a home position and a corner of the fixture or vise and
you will not loose your zero.
Darrell

Subject: Re: G92-program zero


>
> Hi Dave,
> I may have to try xemc, I've been using Tkemc.  It never occurred to me to
> try a different GUI.  What I've found though is that if I set G92 in MDI
> mode and stay in MDI mode I can abort any commanded move without affecting
> the G92 setting.  If I abort a running program the coordinate displays are
> still correct but zero isn't zero any more - I can go to MDI and enter G1X0
> and it will move and it will stop but not at zero - the x coordinate display
> will be non zero.
>    If I let the program end, as soon as it hits the M30 it looses the G92
> setting and the coordinate displays shift - I can go to MDI and type G1X0
> and it will go to zero and display zero but it's not the zero I set with
> G92.
>   Sometimes I want to run two different programs on the same part without
> disturbing the setup or program zero and I can't do it.
>   I didn't think anything should change a G92 setting except another G92 -
> G92.1 - G92.2.
>
> Joel
>
> ----- Original Message -----
> From: "dave engvall" <dengvall-at-elltel.net>
> To: "Multiple recipients of list" <emc-at-nist.gov>
> Sent: Monday, June 04, 2001 1:08 AM
> Subject: Re: G92-program zero
>
>
> >
> > Hi Joel,
> > I've  done all sorts of things to shut down a program under xemc. Switch
> modes
> > i.e. F3 or F5 will halt the program.  Abort. etc. I use M2 to end and
> being a
> > non-expert it never occured to me to use M30.
> > In fact, I'm not aware of ever doing anything that shifts what is set by
> G92.
> > Maybe I just don't do anything fancy.
> > Hope this works for you.
> >
> > Dave
> >
> > Joel Jacobs wrote:
> >
> > > Could someone please explain to me how to stop a running program or even
> > > re-run a program without trashing program zero?  I set program zero with
> g92
> > > before running the program.  If I abort the program or if the program
> > > exicutes M30 (program end and rewind) my program zero gets trashed.
> This is
> > > really frustrating as I have to tear everything down and start over with
> the
> > > test indicator etc to find zero again.  Please help...
> > >
> > > Thanks
> > > Joel
> >
> >
>
>
>