Originally Posted by
Superman
You are missing pic of the work offset page...
But...
Going by your pics, the values that go into G54 would be negative... as that is transferring the datum from machine position to be on the workpiece.
Now.... depending on how you are referencing the G54 Z position ( most use a reference tool, others use the spindle face ) the G43 says to "add" the length offset value to that reference point to move it to the tooltip.
What I don't understand is how you have 18" of tool length when the part Z is only 13.6" from your reference tool point
The value in tool length offset is the distance fron your reference position to the tool tip
Ie. if you use spindle nose as reference, 4" of holder body plus 1.5" of tool stick out should be offset value of 5.5"
If you use the spindle nose as your ref point, I think your offset values should be positive
Remember G43 adds the values, so -13.6 plus -18.25 wants to move -31.85"
That is why your Z wants to go up, up and away
it wants to bring the tooltip at -31.25 to the Z0.55 plane