Re: Z axis Offsets

["William Scalione" <wscalione-at-nc.rr.com>]

Joel,

replies within text

>
> Hi Bill,
>
> ----- Original Message -----
> From: "William Scalione" <wscalione-at-nc.rr.com>
> To: "Multiple recipients of list" <emc-at-nist.gov>
> >
> > I think there is a problem with the BDI and ray's tarball
> > concerning axis offsets. I am running freqmod, commanded,
> > relative and world.
>
> There is.
>
> > First thing I do is Home all Axis' and make sure offsets = 0
> > Before running the program I will move Z to -2" and do a
> > right click on the Z axis and set Z = 0
>
> > At program end, the axis offset for Z goes to zero and
> > rerunning the program will send the Z axis to the true zero
> > point, with cutting taking place at true -.2
>
> This is because EMC is canceling the origin offsets when it ends with M2
or
> M30 - this is documented.  It writes the offsets to the .var file like
> g92.2.  So after the program ends you have to go to MDI mode and enter
G92.3
> to restore the offsets.

Thanks, I'll try that next time


>
> > The EMC still has those offsets in there somewhere
> > because if after the program runs, I do a Z-2 in MDI
> > mode, the offset still reads 0. Then right click on the
> > Z axis and set it at 0 the offset jumps to -4
>
> This is the stange behavior I'm getting if I ABORT a running program and I
> haven't found a way to recover short of a complete restart and loose
> position.



Well if you can remember what you had in there, I have been
going to manual mode, re homing that axis, setting that axis
to zero 2 or 3 times, and then do a MDI command to the desired
offset, and setting that axis to zero (or whatever the offset was before)
again. That works for me, but you need to zero that axis at least
twice after homing.



>
> > Also when starting TkEmc the actual radio button
> > is checked even though Commanded is the default
> > in the INI file.
>
> The variables for the default display mode are in the .ini file but TkEmc
> does not read them - it is hard coded.  I think it's around line 530 in
> TcEmc - just open the file with your handy dandy text editor and change
> "actual" to "commanded".  It's not too hard to find.

Ok, Thanks, that worked. Also got rid of the .0001" increment value since I
never use it when jogging in manual. Now it cycles from .001" to 1" when I
hit the "I" key.



>
> Good luck...Joel
>
>
>
>