Measuring The Workpiece Zero; Overview - Siemens SINUMERIK 840D Operating Manual

2.6

Measuring the workpiece zero

2.6.1

Overview

The reference point for programming a workpiece is always the workpiece zero. You can
determine the workpiece zero on the following workpiece elements:
● Edges, (Page 78)
● Corner (Page 80)
● Pocket and hole (Page 83)
● Spigot (Page 90)
Measuring methods
You can measure the workpiece zero either manually or automatically.
Manual measurement
To measure the zero point manually, you need to traverse your tool manually up to the
workpiece. You can use edge probes, sensing probes, or dial gauges with known radii and
lengths. You can also use any other tool of which you know the radius and length.
The tools used for measuring must not be electronic probes.
Automatic measurement
For automatic measurements, only use the electronic workpiece probe, tool type 710. You
must first calibrate the electronic workpiece probe.
In the case of automatic measuring, first position the workpiece probe manually. After
starting using the <CYCLE START> key, the workpiece probe is automatically extended to
the workpiece with the measuring feedrate. Retraction motion from the measuring point is
realized as a function of the setting data with the rapid traverse velocity or a user-specific
positioning velocity.
Adapting the user interface to the measurement functions
Activate the following selection options using setting data:
● Calibration plane, measurement plane
● Work offset as basis for the measuring process
● Number of the probe calibration data set
● Offset target, adjustable work offset
● Offset target, basis reference
● Offset target, global basis work offset
● Offset target, channel-specific basis work offset
Milling
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
Setting up the machine
2.6 Measuring the workpiece zero
69