# Measuring A Pocket And Hole - Siemens SINUMERIK 840D SL Operating Manual

Setting up the machine
2.6 Measuring the workpiece zero
2.6.8

## Measuring a pocket and hole

You can measure rectangular pockets and one or more holes and then align the workpiece.
Measuring a rectangular pocket
The rectangular pocket must be aligned at right-angles to the coordinate system. By
automatically measuring four points inside the pocket, its length, width and center point can
be determined.
Measuring one hole
The workpiece with the hole to be measured is clamped to the work table in any position. In
the hole, four points are automatically measured, and from this measurement, the diameter
and center point of the hole are determined.
Measuring two holes
The workpiece with the two holes to be measured is clamped to the work table in any
position. Four points are automatically measured in both holes and the hole centers are
calculated from them. Angle α is calculated from the connecting line between both center
points and the reference axis, and the new zero point that corresponds to the center point of
the 1st hole is determined.
Measuring three holes
The workpiece with the three holes to be measured is clamped to the work table in any
position. Four 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 four holes
The workpiece with the four holes to be measured is clamped to the work table in any
position. Four 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 ZO" 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 ZO" softkey nor the
"Calculate" softkey is listed.
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Operating Manual, 02/2012, 6FC5398-7CP40-3BA0
Milling