ACU-RITE MILLPWRG2 - Manual (Page 43)

ACU-RITE MILLPWR G2 25
2.1 Con
v
entions
Absolute and incremental work piece positions
Absolute work piece positions
Absolute coordinates are position coordinates that are referenced to
the datum of the coordinate system (origin). Each position on the work
piece is uniquely defined by its absolute coordinates.
Example 1: Holes dimensioned in absolute coordinates
Incremental work piece positions
Incremental coordinates are referenced to a previous step within the
program, which serves as the relative (imaginary) datum. When you
write a part program in incremental coordinates, you thus program the
tool to move by the distance between the previous and the
subsequent nominal positions. Incremental coordinates are therefore
also referred to as chain dimensions.
Example 2: Holes dimensioned in incremental coordinates
Absolute coordinates of hole 4
X = 10 mm
Y = 10 mm
Hole 1 Hole 2 Hole 3
X = 10 mm X = 30 mm X = 50 mm
Y = 10 mm Y = 20 mm Y = 30 mm
Hole 5, with respect to 4 Hole 6, with respect to 5
X = 20 mm X = 20 mm
Y = 10 mm Y = 10 mm