Axis Error Compensation; Backlash Compensation; Cause Outside Of The Control Loop - HEIDENHAIN TNC 426 PB/M Technical Manual

6.4 Axis Error Compensation

6.4.1 Backlash Compensation

Cause outside of
the control loop
6 – 36
The TNC can compensate the following mechanical axis errors:
n
Backlash
n
Linear axis errors
n
Nonlinear axis errors
n
Thermal expansion
n
Reversal spikes during circular movements
n
Stiction
Per axis you can activate either the linear or the nonlinear axis error
compensation. All other types of compensation are nonexclusive.
During a reversal in axis direction, there is often a little play between the rotary
encoder and table. This play is referred to as backlash.
Positive backlash: The rotary encoder reading is ahead of the table. The table
traverse is too short.
Negative backlash: The rotary encoder reading is behind the table. The table
traverse is too long.
Compensation:
7 7 7 7
In MP710, enter the value that the TNC should add to or subtract from the
encoder signal after a reversal in direction.
MP710.1-8 Backlash compensation for axes 1 to 9
Input: -1.0000 to +1.0000 [mm] or [°]
HEIDENHAIN Technical Manual TNC 426, TNC 430