
4.DESCRIPTION OF PARAMETERS B-64120EN/01
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1851 Backlash compensating value for each axis
[Data type] Word axis
[Unit of data] Detection unit
[Valid data range] -9999 to +9999
Set the backlash compensating value for each axis.
When the machine moves in a direction opposite to the reference
position return direction after the power is turned on, the first backlash
compensation is performed.
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 4.18 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
B
Stopped during cutting feed Stopped during rapid traverse
ssign the measured backlash at cutting feed (A) in parameter No.1851 and that at rapid traverse (B) in parameter No.1852.