Smithy CNC Mills - Manual (Page 74)

8.3 Fixture Offsets (G54-G59.3 )
Work or fixture offset are used to make a part home that is different from the
absolute, machine coordinate system. This allows the part programmer to set up
home positions for multiple parts. A typical operation that uses fixture offsets
would be to mill multiple copies of parts on "islands" in a piece, similar to figure
8-1.
The values for offsets are stored in the VAR file that is requested by the INI file
during the startup of an EMC. In our example below we'll use G55. The values
for each axis for G55 are stored as variable numbers.
5241 0.000000
5242 0.000000
5243 0.000000
5244 0.000000
5245 0.000000
5246 0.000000
In the VAR file scheme, the first variable number stores the X offset, the second
SmithyCNC Programmer’s Reference Manual: Coordinate System 8-3
Figure 8-1 Offsets