Overloaded,

The machine is moving to the coordinates on the dro's which are about 4.5 inches from where they should be.

Not sure what that would mean unless you just have  a shortcut on your desktop?

Hood
Need to leave for about 20 minutes.  How do I attach the file on the desktop to the reply.  See you in 20 minutes?

Use the additional options button on the reply page and browse to the xml and choose.
Hood

Hood,
Tried that several times with no luck.

Looking at the positional data the MC converted correctly when the G21 loaded , BUT the user Coord X0 Y0 did not reset back to X0 Y0 (;-) SO now if you push start the machine will go somewhere it should not go.   ?  AND it still does not explain how the machine ended up 4.5 inches off the original coord base

QUOTE:
Operation:
When I center spindle over shaft:  MC x=17.9441, y=6.6080.   Zero user coordinates, x=0 y=0
Load code:  MC x=455.7804, y=167.8425  User coordinates x=437.8363, y=161.2346.  This change occurred without running the code.
If Mach 3 is shut down and restarted the shaft zero is again x=17.9441 and y=6.6080.

Just a thought, (;-) TP

What are the values in the G54 fixture offset?

Graham

Hood,
Finally !!

Ok from first looks it would seem you have your steps per unit set as mm, is that correct? ie if you command a move of 1 does it move one mm or one inch?
Hood

Grham,

G54 offsets x=4.5 y=1.39
I zeroed g54 and started the program without tooling, it looks close to being right

Hood,

The spindle moves 1 mm