Please Note While Programming - HEIDENHAIN TNC 620 User Manual

17
Touch Probe Cycles: Automatic Kinematics Measurement
17.5 PRESET COMPENSATION (Cycle 452, DIN/ISO: G452, option)

Please note while programming:

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. M128 and FUNCTION TCPM are
deactivated.
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 datum 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
value, whichever is smaller. The TNC always moves
the rotary axes at positioning feed rate Q253, while
the probe monitoring is inactive.
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
and ends the measurement.
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.
Programming in inches: The TNC always records the
log data and results of measurement in millimeters.
466
the TNC shows an error message
HEIDENHAIN | TNC 620 | User's manual for cycle programming | 9/2015
FMAX