Acu-Rite CNC 3500i Absolute and incremental work piece positions, Absolute work piece positions

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

Hole 1	Hole 2	Hole 3
X = 10 mm	X = 30 mm	X = 50 mm
Y = 10 mm	Y = 20 mm	Y = 30 mm

Incremental work piece positions

Incremental coordinates are referenced to the last programmed nominal position of the tool, 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 5, with respect to 4	Hole 6, with respect to 5
X = 20 mm	X = 20 mm
Y = 10 mm	Y = 10 mm

2.1 Fundamentals of Positioning

ACU-RITE 3500i 31