Calibrating The Effective Radius And Compensating Center Misalignment - HEIDENHAIN TNC 620 User Manual

Setup | Calibrating 3-D touch probes (option 17)
Calibrating the effective radius and compensating center
misalignment
HEIDENHAIN only gives warranty for the function of the
probing cycles if HEIDENHAIN touch probes are used.
When calibrating the ball-tip radius, the control executes an
automatic probing routine. In the first run the control finds the
midpoint of the calibration ring or stud (approximate measurement)
and positions the touch probe in the center. Then, in the actual
calibration process (fine measurement), the radius of the ball tip
is ascertained. If the touch probe allows probing from opposite
orientations, the center offset is determined during another cycle.
The property of whether or how your touch probe can be oriented is
predefined for HEIDENHAIN touch probes. Other touch probes are
configured by the machine tool builder.
After the touch probe is inserted, it normally needs to be aligned
exactly with the spindle axis. The calibration function can determine
the offset between touch probe axis and spindle axis by probing
from opposite orientations (rotation by 180°) and can calculate and
implement the necessary compensation.
The center offset can be determined only with a suitable
touch probe.
If you want to calibrate using the outside of an object, you
need to preposition the touch probe above the center of
the calibration sphere or calibration pin. Ensure that the
touch points can be approached without collision.
The calibration routine varies depending on how your touch probe
can be oriented:
No orientation possible, or orientation in only one direction: The
control executes one approximate and one fine measurement,
and then ascertains the effective ball tip radius (column R in
tool.t).
Orientation possible in two directions (e.g. HEIDENHAIN touch
probes with cable): The control executes one approximate and
one fine measurement, rotates the touch probe by 180°, and then
executes another probing routine. The center offset (CAL_OF in
tchprobe.tp) is determined in addition to the radius by probing
from opposite orientations.
Any orientation possible (e.g. HEIDENHAIN touch probes with
infrared transmission): The control executes one approximate
and one fine measurement, rotates the touch probe by 180°, and
then executes another probing routine. The center offset (CAL_OF
in tchprobe.tp) is determined in addition to the radius by probing
from opposite orientations.
HEIDENHAIN | TNC 620 | User's Manual for Setup, Testing and Running NC Programs | 01/2022
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