Calibrating The Workpiece Probe - Siemens SINUMERIK 840D sl Programming Manual

4.2.2

Calibrating the workpiece probe

4.2.2.1 General information
Prerequisite
The workpiece probe is the active tool in the spindle with activated tool offsets. The
approximate length and the radius of the measuring probe sphere must be entered in the
tool data.
An SPOS-capable spindle is required to calibrate the radius of the measuring probe sphere.
Calibration process
On milling machines and machining centers, the workpiece probe is inserted in the spindle.
This can lead to measuring errors caused by the clamping tolerances of the probe in the
spindle. The switching points (trigger points) of the measuring probe with reference to the
spindle center must therefore be determined for each new probe inserted.
This is achieved with calibration by which the probe is calibrated in a hole or on a surface.
Note
The feedrate override should have the same value during calibration and measurement to
reduce measurement inaccuracies.
Operation
After you have pressed the "probe calibration" softkey, a display image is shown, containing
the following options:
• "Length" (calibrating the length of the probe at the surface)
• "Radius" (calibrating the radius of the measuring probe sphere in the hole)
The reference dimension for the diameter of the calibration hole and the height of the
calibration surface to be specified can be pre-assigned using the following GUD parameters:
• E_MESS_CAL_D → diameter, calibration hole (calibration ring)
• E_MESS_CAL_L → calibration height in the feed axis (refer to WCS)
Measuring cycles
Programming Manual, Release 04/2006, 6FC5398-4BP10-0BA0
Measuring in JOG
4.2 Workpiece measurement
4-9