Siemens SINUMERIK 840D sl Operating Manual page 102

Setting up the machine
2.6 Measuring the workpiece zero
Measuring two circular spigots
The workpiece is located anywhere on the work table and has 2 spigots. Four points are
automatically measured at the two spigots and the spigot centers are calculated from them.
The 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 first spigot
is determined.
Measuring three circular spigots
The workpiece is located anywhere on the work table and has three spigots. Four points are
automatically measured at the three spigots and the spigot centers are calculated from them.
A circle is placed through the three center points and the circle center and circle diameter
are determined.
When an angular offset is selected, the base angle of rotation α can also be determined.
Measuring four circular spigots
The workpiece is located anywhere on the work table and has four spigots. four points are
automatically measured at the four spigots and the spigot centers are calculated from them.
Two spigot center points are each connected diagonally and the intersection point of the two
lines is then 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 spigot" and "1 circular spigot" are an exception. For
these single-point measurements, for "Measuring only" neither the "Set ZO" softkey nor the
"Calculate" softkey is listed.
Note
You can only measure 2, 3, and 4 circular spigots automatically.
Requirement
You can insert any tool in the spindle for scratching when measuring the workpiece zero
manually.
An electronic workpiece probe is inserted in the spindle and activated when measuring the
workpiece zero automatically.
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Operating Manual, 03/2013, 6FC5398-7CP40-3BA1
Milling