Please Note While Programming - HEIDENHAIN TNC 620 User Manual

17
Touch Probe Cycles: Automatic Kinematics Measurement | PRESET COMPENSATION (Cycle 452, DIN/

Please note while programming:

Before starting the cycle make sure that M128 or
FUNCTION TCPM is deactivated.
Cycle 453, as with 451 and 452, is exited with an active
3-D ROT in automatic mode that matches the position of
the rotary axes.
In order to be able to perform a preset compensation,
the kinematics must be specially prepared. The machine
manual provides further information.
Note that all functions for tilting in the working plane are
reset.
Position the calibration sphere on the machine table so
that there can be no collisions during the measuring
process.
Before defining the cycle you must set the preset in the
center of the calibration sphere and activate it.
For rotary axes without separate position encoders,
select the measuring points in such a way that you have
to traverse a distance of 1° to the limit switch. The TNC
needs this distance for internal backlash compensation.
For the positioning feed rate when moving to the
probing height in the touch probe axis, the TNC uses the
value from cycle parameter Q253 or the
whichever is smaller. The TNC always moves the rotary
axes at positioning feed rate Q253, while the probe
monitoring is inactive.
If you interrupt the cycle during the measurement,
the kinematic data might no longer be in the original
condition. Save the active kinematic configuration before
an optimization with Cycle 450, so that in case of a
failure the most recently active kinematic configuration
can be restored.
If the kinematic data are greater than the permissible
limit (maxModification), the TNC shows a warning.
Then you have to confirm acceptance of the attained
value by pressing NC start.
Note that a change in the kinematics always changes
the preset as well. After an optimization, reset the
preset.
In every probing process the TNC first measures
the radius of the calibration sphere. If the measured
sphere radius differs from the entered sphere radius
by more than you have defined in machine parameter
maxDevCalBall (No. 204802) the TNC shows an error
message and ends the measurement.
Programming in inches: The TNC always records the log
data and results of measurement in millimeters.
512
FMAX value,
HEIDENHAIN | TNC 620 | User's manual for cycle programming | 10/2017
ISO: G452, option)