2
Setting Up the Machine 08/2005
2.6 Measurin
the work
iece zero-
oint
2
♥ Siemens AG, 2005. All rights reserved
2-70 SINUMERIK 840D sl Operation/Programming ShopTurn (BAT) – 08/2005 Edition
2.6 Measuring the workpiece zero-point
The reference point for programming a workpiece is always the
workpiece zero. To determine this zero-point, measure the length of
the workpiece and save the position of the cylinder in the direction Z in
a zero-point offset. This means that the position is stored in the coarse
offset and existing values in the fine offset are deleted.
The prerequisite for measuring the workpiece is that a tool with known
lengths is in the machining position (see Sec. "Select Tool and
Spindle").
Jog
Select the "Meas. workp." softkey in "Machine Manual" mode.
Select the desired offset in which the position of the cylinder front
surface is to be saved.
-or-
Work
offset
Press the "Work offset” softkey.
-and-
Position the cursor on the desired zero-point offset.
-and-
Back to
manual
Press the "Back to manual" softkey.
Traverse the tool in the direction Z and scratch it (see Sec.
"Traversing the Axes").
Enter the desired position of the workpiece edge Z0.
Set work
offset
Press the "Set work offset” softkey.
The workpiece zero-point and the accompanying zero-point offset are
calculated. The tool length is automatically included in the calculation.
Example: Workpiece edge desired position Z0 = 0
Tool length offset Z = 37.6 mm
⇒ Z = -37.6
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