200S 3
I - 1 Fundamentals of Positioning
Absolute Workpiece Positions
Each position on the workpiece is uniquely identified by its
absolute coordinates.
Example: Absolute coordinates of position 1:
X = 20 mm
Y = 10 mm
Z = 15 mm
If you are drilling, or milling a workpiece according to a workpiece
drawing with absolute coordinates, the tool is moving to the value of
the coordinates.
Incremental workpiece positions
A position can also be referenced to the preceding nominal position.
In this case the relative datum is always the last nominal position.
Such coordinates are referred to as incremental coordinates
(increment = increase). They are also called incremental, or chain
dimensions, since the positions are defined as a chain of dimensions.
Incremental coordinates are designated with the prefix I.
Example: Incremental coordinates of position 3 referenced
to position 2.
Absolute coordinates of position 2:
X = 10 mm
Y = 5 mm
Z = 20 mm
Incremental coordinates of position 3:
IX = 10 mm
IY = 5 mm
IZ = 20 mm
If you are drilling, or milling a workpiece according to a drawing with
incremental coordinates, you are moving the tool by the value of
the coordinates.
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