
1.AXIS CONTROL B-63783EN-1/01
- 88 -
- Second-stage backlash compensation output
The output of second-stage backlash compensation begins at distance
L
1
from a point where the direction of axis movement is reversed and
ends at distance L
2
from that point. The total amount (B
2
) of backlash
compensation performed before the second-stage backlash
compensation output ends is the same as the backlash compensation
amount specified using parameter No. 1851. Distances L
1
and L
2
are
specified using parameter Nos. 1846 and 1847, respectively.
If cutting-/rapid traverse-specific compensation is enabled (parameter
RBK (bit 6 of parameter No. 1804) = 1) is enabled, the total amount
(B
2
) of backlash compensation performed before the second-stage
backlash compensation output ends becomes equal to the backlash
compensation amount determined according to parameter No. 1849,
parameter No. 1851, the direction of axis movement after reversed, and
cutting/rapid traverse mode. However, the rate at which the second-
stage backlash compensation output increases remains to be the same
as that during cutting. (Expression 1)
12
1
1851.Parameter
increasesoutput on compensatibacklash stage-second heat which t Ratio
LL
BNo
−
−
=
(1)
Shown below is an example where the direction of axis movement is
reversed by switching from cutting feed to rapid traverse. (Fig.
1.3.11(g))
Axis movement
direction
(Direction reversed)
Total amount of backlash compensation
after the direction is reversed
Amount of movement
after the direction is
reversed
0
B2 (parameter 1851)
B1 (parameter 1848)
L1
(Parameter
1846)
L2
(Parameter
1847)
Fig. 1.3.11(g) Switching from Cutting Feed to Rapid Traverse
Parameters
#7 #6 #5 #4 #3 #2 #1 #0
2603 SBL
[Input type] Parameter input
[Unit of data] Bit axis
# 0 SBL Specifies whether to enable smooth backlash compensation as follows:
0: Disable.
1: Enable.