HEIDENHAIN TNC 620 User Manual page 515

Calibrating the effective radius and compensating
center misalignment
HEIDENHAIN only warrants the function of the touch
probe cycles if HEIDENHAIN touch probes are used.
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.
When calibrating the ball tip radius, the TNC executes an automatic
probing routine. During the first cycle, the TNC determines
the center of the calibration ring or stud (rough measurement)
and positions the touch probe in the center. Then the ball tip
radius is determined during the actual calibration process (fine
measurement). If the touch probe allows probing from opposite
orientations, the center offset is determined during another cycle.
The characteristic of whether and how your touch probe can be
oriented is predefined in HEIDENHAIN touch probes. Other touch
probes are configured by the machine manufacturer.
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 calibration routine varies depending on how your touch probe
can be oriented:
No orientation possible or orientation possible in only
one direction: The TNC executes one rough and one fine
measurement and determines the effective ball tip radius
(column R in tool.t)
Orientation possible in two directions (e.g.HEIDENHAIN
wired touch probes): The TNC executes one rough and one
fine measurement, rotates the touch probe by 180° and
then completes one more probing routine. The center offset
(CAL_OF in tchprobe.tp) is determined in addition to the radius
by probing from opposite orientations
Orientation possible in any direction (e.g. HEIDENHAIN
infrared systems): The TNC executes one rough and one
fine measurement, rotates the touch probe by 180° and
then completes one more 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 | Conversational Programming User's Manual | 10/2015
Calibrating a 3-D touch trigger probe
14
14.8
515