12. Tool Compensation Functions
12.4 Tool Radius Compensation
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12.4.8 Interference Check
Function and purpose
(1) Outline
A tool, whose radius has been compensated with the tool radius compensation function by the
usual 2-block pre-read, may sometimes cut into the workpiece. This is known as interference,
and interference check is the function which prevents this from occurring.
There are three types of interference check, as indicated below, and each can be selected for
use by parameter.
Function Parameter
Operation
Interference check
alarm function
#8102 : OFF
#8103 : OFF
A program error results before the execution of the
block in which the cut arises, and operation stops.
Interference check
avoidance function
#8102 : ON
#8103 : OFF
The tool path is changed so that workpiece is not
cut into.
Interference check
invalid function
#8103 : ON
Cutting proceeds unchanged even when it occurs.
Use this for microscopic segment programs.
(Note)
#8102 COLL. ALM OFF (interference check avoidance)
#8103 COLL. CHK OFF (interference check invalid)
Detailed description
(Example)
Avoidance path
Outer diameter
of tool
N1
N3
N2
(G41)
N1 G90 G1 X50. Y-100.;
N2 X70. Y-100.;
N3 X120. Y0;
Cutting with N2
Cutting with N2
(1) With alarm function
The alarm occurs before N1 is executed and so, using the edit function, N1 can be changed as
below and machining can be continued :
N1 G90 G1 X20. Y
−
40. ;
(2) With avoidance function
The intersection point of N1 and N3 is calculated and the interference avoidance vectors are
created.