Siemens SINUMERIK 840D Operation/Programming Manual page 64

2
Operation
2.6 Measuring workpiece zero
Sequence of operations
Prepositioning
Examples
2-64
To measure the workpiece zero, the tool must always be
perpendicular to the machining plane (e.g. with "Align plane"). In
some measuring methods, the workpiece must first be aligned parallel
to the coordinate system (set edge, distance 2 edges, rectangular
pocket, rectangular spigot).
To do this, it may be necessary to perform the measurement in
several stages.
1. "Align plane" (to align the tool perpendicular to the plane)
2. "Align edge" (to align the workpiece parallel with the coordinate
system)
3. "Set edge", "Distance 2 edges", "Rectangular pocket", or
"Rectangular spigot" (to determine the zero point)
Or
1. "Align plane" (to align the tool perpendicular to the plane)
2. "Corner", "Holes", or "Spigots" (to align the tool parallel with the
coordinate system and define the zero point)
If you want to preposition a rotary axis before measuring with "Align
edge", move the rotary axis so that your workpiece is already
approximately parallel to the coordinate system. Set the relevant
rotary axis angle to zero with "Set WO" Measurement with "Align
edge" will then correct the value for rotary axis offset or include it in
the coordinate rotation and align the workpiece edge precisely.
If you want to preposition your workpiece with "Align edge" prior to
measurement, you can set the angle values under "Manual swivel".
With "Set zero plane" you transfer the resulting rotations into the
active work offset. The measurement with "Align edge" will then
correct the value for the coordinate rotations and align the workpiece
precisely.
If the function "Swivel" is set up on your machine, we recommend
effecting a swivel motion to zero before starting measurement. In that
way, you will ensure that the rotary axis positions comply with the
current coordinate system.
Two typical examples are given below that demonstrate the
interaction between and the use of "Measure workpiece" and "Manual
swivel" when measuring and aligning workpieces:
SINUMERIK 840D/840Di/810D Operation/Programming ShopMill (BAS) – 10.04 Edition
2
10.04
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