
B-63943EN-1/02 1.AXIS CONTROL
- 63 -
- Example
Imagine a table whose Y-axis ball screw is placed on its X-axis ball
screw. If the X-axis ball screw is inclined at a certain angle because of,
for example, bending, the machining precision related to the Y-axis
becomes low because its ball screw is affected by the gradient of the
X-axis ball screw. (Left figure shown below)
Specifying the X-axis and Y-axis, respectively, as a moving axis and a
compensation axis by means of straightness compensation causes the
Y-axis (compensation axis) position to be compensated according to
the X-axis (moving axis) position, thus increasing the machining
precision. (Right figure shown below)
Y-a xis
P1
P2
P3 P4
X-
axis
Path of the B section
Path of point A
B
P1, P2, P3, P4 : Points on the moving axis
The path of the B section, which is a joint between the X-axis
and Y-axis, is affected by the gradient of the X-axis because
of the structure of the table. If a command specifies
movement from P1 to P4 only along the X-axis withou
applying straightness compensation, the path of point A along
the Y-axis is affected by the gradient of the X-axis.
P1, P2, P3, P4 : Points on the moving axis
1,
2,
3,
4 : Compensation amount for each compensation
point along the compensation axis
If a command specifies movement from P1 to P4 only along
the X-axis (moving axis), when the B section moves in the
sequence P1 → P2 → P3 → P4, straightness compensation
gives compensation amounts ε1 to ε4 to the Y-axi
(compensation axis). This Y-axis compensation keeps the path
of point A along the Y-axis from being affected by the gradien
of the X-axis even when the B section, which is a joint between
the X-axis and Y-axis, is affected by the gradient of the X-axis.
Y-axis
P1
P2
P3 P4
X-
axis
Path of the B section
Path of point
B
1
2
ε3
4
1
2
ε3
4
Parameter
5711 Straightness compensation : Axis number of moving axis 1
5712 Straightness compensation : Axis number of moving axis 2
5713 Straightness compensation : Axis number of moving axis 3
5714 Straightness compensation : Axis number of moving axis 4
5715 Straightness compensation : Axis number of moving axis 5
5716 Straightness compensation : Axis number of moving axis 6
NOTE
When this parameter is set, the power must be
turned off before operation is continued.
[Input type] Parameter input