Re: G92-program zero

["Joel Jacobs" <jj-at-netexp.net>]

Neither,  I am not doing any G92 commands in the program itself.  I am
manually jogging the machine to my program zero position - the corner of the
fixture or the vice or whatever - then I go to MDI mode and type G92X0Y0Z0
and the coordinates displayed all change to zero.  Then I run the program.
When the program finishes it destroys my carefully acquired zero point.

Joel

----- Original Message -----
From: "Darrell" <dgehlsen-at-earthlink.net>
To: "Multiple recipients of list" <emc-at-nist.gov>
Sent: Monday, June 04, 2001 11:59 AM
Subject: Re: G92-program zero


>
> 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
> > >
> > >
> >
> >
> >
>
>