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There are machines, such as bridge mills, that have a W-axis that allows the bridge section of the machine to move from the extreme top of the machine and advance the bridge and tool closer to the part while not extending the Z-axis/Quill. The machine supplied in the Samples directory, head_changer_connect.vcproject, is one such machine. If you do not shift the original work coordinate after moving the W-axis the tool will not be in the correct location. If your machine moves the W-axis as a machine reference type motion this can be added to your "W" definition to compensate the work coordinate. The programming of our machine would be "W0.0" to return the bridge to the top of the machine and "W-##.####" to move the bridge closer to the table.
Sample G-code command....
G0 W-25.0
Settings used in my Control file G-Code Processing Word/Address Register "W"
W *
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[-] * *
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WAxisMachineMotion
WorkCoordZValue
Value=$*-1
AbsoluteShift
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