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14 The Tool Compensation
109
Fig. 14.5.8-4
If parameter ANGLAL is set to 0, the control will not return an error message, but will automatically
attempt to correct the contour in order to avoid overcutting. The procedure of compensation is as
follows.
Each of blocks A, B and C are in offset mode. The computed vectors between blocks A and B are
LP
1
, LP
2
, LP
3
, LP
4
; the compensation vectors between blocks B and C are LP
5
, LP
6
, LP
7
, LP
8
.
- LP
4
and LP
5
will be ignored if there is an interference between them.
- LP
3
and LP
6
will be ignored if there is an interference between them.
- LP
2
and LP
7
will be ignored if there is an interference between them.
- LP
1
and LP
8
cannot be omitted in the case of an interference, so an error message is
returned.
It is evident from the foregoing that the compensation vectors are paired at the start and end points
of interpolation B, and will be ignored in pairs. If the number of compensation vectors on one side is
1 (or is reduced to 1), only the vectors on the other side will be omitted. The procedure of omitting
will be carried on as long as the interference persists. The first compensation vector at the start point
of interpolation B and the last one at the respective end point cannot beignored. If, as a result of
omissions, the interference is eliminated, no error message will be returned, but error message 3048
INTERFERENCE ALARM will be returned otherwise. The remaining compensation vectors after
each omission will always be interconnected by straight lines - even if interpolation B has been a
circular one.
It is evident from the above example that the execution of interpolation A will not be commenced
unless interpolation B has been checked for an interference. To do so, however, block C also had
to be entered in the buffer, and the compensation vectors had to be calculated for transition B - C.
A few typical instances of interference will be described below.
Milling a step smaller than the tool radius.
The control returns error message 3048
INTERFERENCE ALARM or else it
would cut in the workpiece.