Siemens SINUMERIK 840D Operating Manual page 84

Setting up the machine
2.6 Measuring the workpiece zero
Measuring 3 holes
The workpiece with the three holes to be measured is clamped to the work table in any
position. 4 points are automatically measured in the three holes and the hole centers are
calculated from them. A circle is placed through the three center points. The center point and
the diameter are determined from this circle. This center point represents the new workpiece
zero to be determined. When an angular offset is selected, the base angle of rotation α can
also be determined.
Measuring 4 holes
The workpiece with the four holes to be measured is clamped to the work table in any
position. 4 points are automatically measured in the four holes and the hole centers are
calculated from them. Two hole center points are diagonally connected in each case. The
point of intersection is determined from the two lines that are obtained. This point of
intersection represents the new workpiece zero to be determined. When an angular offset is
selected, the base angle of rotation α can also be determined.
Note
"Measuring only" for automatic measuring
If "Measuring only" is selected as offset target, then instead of the "Set WO" softkey, the
"Calculate" softkey is displayed.
The measuring versions "Rectangular pocket" and "1 hole" are an exception. For these
single-point measurements, for "Measuring only" neither the "Set WO" softkey nor the
"Calculate" softkey is listed.
Note
You can only measure 2, 3, and 4 holes automatically.
Precondition
You can insert any tool in the spindle for scratching when measuring the workpiece zero
manually.
- OR -
An electronic workpiece probe is inserted in the spindle and activated when measuring the
workpiece zero automatically.
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Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
Milling