
B-63943EN-1/02 1.AXIS CONTROL
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・First stage backlash compensation output
At the location where the direction of axis moving reverses, the first
stage backlash compensation output is performed. Set the first stage
backlash compensation B
1
, using parameter No. No.1848.
・Second stage backlash compensation output
At the point the tool moves by the distance L1 from the location
where the direction of axis moving reverses, the second stage backlash
compensation output is started. And, at the point the tool moves by
the distance L2 from the location where the direction of axis moving
reverses, the second stage backlash compensation output is terminated.
The total amount of backlash at the stage where the second stage
backlash compensation output is terminated, or B2, is the same as the
backlash compensation set using parameter No. No.1851. Set the
distances L1 and L2, using parameters Nos. 1846 and 1847,
respectively.
If backlash compensation for each rapid traverse and cutting feed is
enabled (RBK, bit 4 of parameter No. 1800 = 1), the total amount of
backlash compensation at the stage where the second stage backlash
compensation output is terminated, or B2, is the backlash
compensation as determined by parameters Nos. 1852 and 1851, the
reversed direction, and the rapid traverse/cutting feed mode. The
rate of increase of the second stage backlash compensation output
remains the same as that during cutting. (Expression 1)
1
L
2
L
1
B1851No.
sec
−
−
=
Parameter
ionoutputhcompensatondbacklaseaseofRateofincr
(1)
The following shows an example in which the tool is changed from
cutting feed to rapid traverse feed and the direction reverses.
(Fig. 1.3.3 (c))
Direction of
axis moving
(Direction reverse)
Total amount of backlash
compensation after direction reverse
Distance of travel after
direction reverse
0
(Parameter No.
1851)
B1 (parameter No. 1848)
L1
(parameter No.
1846)
L2
(parameter No.
1847)
Cutting feed
Rapid traverse
B2
where B2 = (parameter No. 1851 + parameter No. 1852) / 2
Fig. 1.3.3 (c) In the case of a change from cutting feed to rapid traverse