2013/9/3 Bob Weiss <bweiss0...@gmail.com>

>
> After homeing the machine and switching to World mode it made X and Y 0.0
> but changed Z to -278.00 ? Not sure where it got that value from for Z?
>

Are those machine or relative coordinates?

Currently it seems that Andy is right - you see relative (workpiece)
coordinates so simply do "touch off" for Z axis. Ideally for testing
purposes you might want to set workpiece and machine coordinates to be the
same. You can switch Axis GUI to show either machine or relative
coordinates with Shift+3 combination to see, what is the difference between
them.
In MDI you can also command a movement in machine coordinate system by
adding G53 before G0 word. This is one more thing you can use for testing.
It looks to me that there are few things for you to learn about all these
various coordinate system things, so here is a link for a start:
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?CoordinateSystems

-- 
Viesturs
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