Heidenhain ND 522 User Manual download pdf (Page 13)

ND 522/523 13

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

When drilling, or milling a workpiece according to a workpiece drawing

with absolute coordinates, the tool is moving 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 = 10 mm

IZ = –15 mm

When drilling, or milling a workpiece according to a drawing with

incremental coordinates, the tool is moving by the value of the

coordinates.

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Heidenhain ND 522 User Manual Page 13