Re: Z axis Offsets

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

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.

> 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.

> 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.

Good luck...Joel