Reference Points On The Machine And Workpiece - Siemens SINUMERIK 840D sl Programming Manual

1.4

Reference points on the machine and workpiece

General information
Depending on the measuring task, measured values may be required in the machine
coordinate system or in the workpiece coordinate system.
e.g.: It may be easier to ascertain the tool length in the machine coordinate system.
Workpiece dimensions are measured in the workpiece coordinate system.
Where:
● M = Machine zero
● W = Workpiece zero
● F = Tool reference point
Reference points
The position of tool reference point F in the machine coordinate system is displayed with
machine zero M as the machine actual value.
The position of the tool tip (active tool) in the workpiece coordinate system is displayed with
workpiece zero W as the workpiece actual value. If a workpiece probe is active, the position
usually refers to the center point of the probe ball.
The zero offset (ZO) characterizes the position of the workpiece on the machine.
The ZO is the position of workpiece zero W in the machine coordinate system.
In addition to the pure offset, a ZO might also include rotation, mirroring, and a dimension
factor. Together these are termed a frame.
Measuring cycles
Programming Manual, 03/2009 Edition, 6FC5398-4BP10-2BA0
1.4 Reference points on the machine and workpiece
Z
Z1
W
Y1
M
General
F
Y
X
X1
L1
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