
B–63522EN/02
15. ACCURACY COMPENSATION
FUNCTION
NC FUNCTION
227
This function is used to compensate lost motions proper to the machine
system. Offset amounts come in a range of 0 to ±9999 pulses per axis,
and is set as parameters in detection unit.
Since different backlash compensation values can be used for cutting feed
and rapid traverse, the machining precision is improved.
The following table shows backlash amounts according to the feedrate
and movement direction. In the table, the backlash compensation amount
for cutting feed is A, and that for rapid traverse is B. A and B are set in
parameters.
Cutting
feed
↓
Cutting
feed
Rapid
traverse
↓
Rapid
traverse
Rapid
traverse
↓
Cutting
feed
Cutting
feed
↓
Rapid
traverse
Movement in same direction 0 0 ±α ±(–α)
Movement in opposite directions ±A ±B ±(B+α) ±(B+α)
*1) α=(A–B) / 2
*2) Sings (+ and –) indicate directions.
α
α
Stop in cutting feed
A
Cutting feed
Stop in rapid traverse
B
α : Excess of machine movement
Rapid traverse
15.7
BACKLASH
COMPENSATION
15.8
BACKLASH
COMPENSATION
SPECIFIC TO RAPID
TRAVERSE AND
CUTTING FEED