
B–63833EN–1/02
1. AXIS CONTROL
36
Function for compensating for lost motion on the machine. Set a
compensation value in parameter No. 1851, in detection units from 0 to
"9999 pulses for each axis.
More precise machining can be performed by changing the backlash
compensating value depending on the feedrate, the rapid traverse or the
cutting feed.
Let the measured backlash at cutting feed be A and the measured backlash
at rapid traverse be B. The backlash compensating value is shown below
depending on the change of feedrate (cutting feed or rapid traverse) and
the change of the direction of movement.
Cutting feed to
cutting feed
0 "α
" (*α)
"A "B "(B+α)
" (B+α)
Change of feedrate
Change of direction
of movement
Rapid traverse
to rapid traverse
Rapid traverse
to cutting feed
Cutting feed to
rapid traverse
Same direction
Opposite direction
0
@ a = (A–B)/2
@ The positive or negative direction for compensating values is the
direction of movement.
⇒⇒
αα
AB
Stopped during cutting feed Stopped during rapid traverse
a : Overrun
@ Assign the measured backlash at cutting feed (A) in parameter No.
1851 and that at rapid traverse (B) in parameter No. 1852.
1.3.2
Backlash
Compensation
General
D Backlash compensation
D Backlash compensation
for each rapid traverse
and cutting feed