HEIDENHAIN ND 710 v.3 - Manual (Page 6)

6
Absolute workpiece positions
Each position on the workpiece is uniquely defined by its absolute
coordinates.
Example
Absolute coordinates of position 1:
X = 10 mm
Y = 5 mm
Z = 0 mm
If you are working according to a workpiece drawing with absolute
dimensions, then you are moving the tool to the coordinates.
Y
X
Z
10
5
1
Fundamentals
1
Y
X
Z
10
5
10
10
1
2
Relative workpiece positions
A position can also be defined relative to the previous nominal
position. The datum for the dimension is then located at the
previous nominal position. Such coordinates are termed relative
coordinates or chain dimensions. Incremental coordinates are
indicated by a preceding I.
Example
Relative coordinate of position 2 referenced to
position 1 :
IX = 10 mm
IY = 10 mm
If you are working according to a workpiece drawing with
incremental dimensions, then you are moving the tool by the
dimensions.
Sign for incremental dimensioning
A relative dimension has a positive sign when the axis is moved
in the positive direction, and a negative sign when it is moved
in the negative direction.
Bateil1.pm6 07.11.2001, 09:38 6