
B-63783EN-1/01 10.TOOL FUNCTION
- 1087 -
Shifting the control point
Conventionally, the center of a rotation axis was used as the control
point. The control point can now be shifted as shown in the figure
below.
Then, when the rotation axis is at the 0-degree position also in tool
length compensation along the tool axis (G43.1), the control point can
be set to the same position as that for ordinary tool length compensation
(G43).
The control point here is indicated with machine coordinates.
When linear interpolation is specified, for example, this control point
moves linearly.
Shift
vector
Ordinary tool length
compensation (G43)
Tool length compensation along
tool axis (G43.1) :
When tool is not tilted
Control
oint
Control
point before
shift
Control
oint
Tool length compensation along
tool axis (G43.1) :
When tool is tilted
Machine coordinate ori
in
Work
iece coordinate ori
in
Tool length
compensation
vector
Fig. 10.4.11 (c) Shift of the Control Point
The method of shifting the control point can be selected using the
following parameters:
Table 10.4.11 (b) Methods of Shifting the Control Point
Bit 5 (SVC) of
parameter No. 7540
Bit 4 (SBP) of
parameter No. 7540
Shift of control point
0 - As in the conventional case, the control point is not shifted.
1 0 The control point is shifted, and the shift vector is calculated
automatically as follows:
- (rotation center compensation vector (parameter No. 7519))
+ spindle center compensation vector (parameter No. 7520))
+ tool holder offset along tool axis (parameter No. 7548)))
1 1 The control point is shifted, and the shift vector is the vector set in
parameter No. 7745.