
B-63950EN/02 4.DESCRIPTION OF PARAMETERS
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1852 Backlash compensating value used for rapid traverse for each axis
[Input type] Parameter input
[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 cutting
feed or the rapid traverse positioning. 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.
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+α) ±(B+α)
NOTE
1 α=(A-B)/2
2 The positive or negative direction for compensating
values is the direction of movement.
1874 Numerator of the flexible feed gear for the built-in position detector
1875 Denominator of the flexible feed gear for the built-in position detector
NOTE
When this parameter is set, the power must be
turned off before operation is continued.
[Input type] Parameter input
[Data type] Word axis
[Valid data range] 1 to 32767
When using temporary absolute coordinate setting, set the flexible
feed gear for the built-in position detector on each axis. The settings
are as follows:
No.1874
No.1875
=
Number of position feedback pulses per motor revolution
1,000,000