
B–63090EN/02
4. DESCRIPTION OF PARAMETERS
97
1852 Backlash compensating value used for rapid traverse for each axis
[Data type] Word axis
[Unit of data] Detection unit
[Valid data range] –9999 to +9999
Set the backlash compensating value used in rapid traverse for each axis.
This parameter is valid when RBK, #4 of parameter 1800, is set to 1.
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.
Table 4.17 Backlash Compensating Value
Change of feedrate
Change of direction of movement
Cutting feed to
cutting feed
Rapid traverse
to rapid traverse
Rapid traverse to
cutting feed
Cutting feed to
rapid traverse
Same direction 0 0 ±α ± (–α)
Opposite direction ±A ±B ±B (B+α) ±B (B+α)
α = (A–B)/2
The positive or negative direction for compensating
values is the direction of movement.
a
a
A
B
Stopped during cutting feed Stopped during rapid traverse
Assign the measured backlash at cutting feed (A) in parameter No.1851 and that at rapid traverse (B) in param-
eter No.1852.
NOTE
1 Jog feed is regarded as cutting feed.
2 The backlash compensation depending on a rapid traverse and a cutting feed is not performed
until the first reference position return is completed after the power is turned on. The normal
backlash compensation is performed according to the value specified in parameter No.1851
irrespective of a rapid traverse and a cutting feed.
3 The backlash compensation depending on a rapid traverse and a cutting feed is performed only
when RBK, #4 of parameter No.1800, is set to 1. When RBK is set to 0, the normal backlash
is performed.
1870 Number of the program for storing servo trace data
[Data type] Word axis
[Valid data range] 0 to 9999
Set the number of the program for storing servo trace data.