Drift Compensation - HEIDENHAIN TNC 620 User Manual

PRESET COMPENSATION (Cycle 452, DIN/ISO: G452, option)

Drift compensation

During machining various machine components are subject to drift
due to varying ambient conditions. If the drift remains sufficiently
constant over the range of traverse, and if the calibration sphere
can be left on the machine table during machining, the drift can be
measured and compensated with Cycle 452.
Clamp the calibration sphere
Insert the touch probe
Measure the complete kinematics with Cycle 451 before starting
the machining process
Set the preset (using Q432 = 2 or 3 in Cycle 451) after measuring
the kinematics.
Then set the presets on your workpieces and start the machining
process
HEIDENHAIN | TNC 620 | User's manual for cycle programming | 9/2015
Reference measurement for drift
compensation
1 TOOL CALL "TCH PROBE" Z
2 CYCL DEF 247 DATUM SETTING
Q339=1 ;DATUM NUMBER
3 TCH PROBE 451 MEASURE
KINEMATICS
Q406=1 ;MODE
Q407=12.5 ;SPHERE RADIUS
Q320=0 ;SET-UP CLEARANCE
Q408=0 ;RETR. HEIGHT
Q253=750 ;F PRE-POSITIONING
Q380=+45 ;REFERENCE ANGLE
Q411=+90 ;START ANGLE A AXIS
Q412=+270;END ANGLE A AXIS
Q413=45 ;INCID. ANGLE A AXIS
Q414=4 ;MEAS. POINTS A AXIS
Q415=-90 ;START ANGLE B AXIS
Q416=+90 ;END ANGLE B AXIS
Q417=0 ;INCID. ANGLE B AXIS
Q418=2 ;MEAS. POINTS B AXIS
Q419=+90 ;START ANGLE C AXIS
Q420=+270;END ANGLE C AXIS
Q421=0 ;INCID. ANGLE C AXIS
Q422=3 ;MEAS. POINTS C AXIS
Q423=4 ;NO. OF PROBE POINTS
Q431=3 ;PRESET
Q432=0 ;BACKLASH, ANG.
RANGE
17
17.5
471