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14 The Tool Compensation
107
Fig. 14.5.7-15
Fig. 14.5.8-1
Two or more compensation vectors may be produced
when going around sharp corners. When their end
points lie close to each other, there will be hardly any
motion between the two points.
When the distance between the two vectors is smaller
than the value of parameter DELTV in each axis, the
vector shown in the Figure will be omitted, and the
path of the tool will be modified accordingly.
L Note: When parameter DELTV is too high (in
causeless way) the sharp corners with acute
angles may be overcut.
14.5.8 Interferences in Cutter Compensation
It may frequently occur in offset mode that the path of the tool is the opposite of the programmed
one. Under such conditions, the tool may cut into the workpiece contrary to the programmer's
intentions. This phenomenon is referred to as the interference in cutter compensation.
In the case shown in the Figure, after the intersection points
have been computed, a tool path opposite to the
programmed one will be obtained in the execution of
interpolation N2. The hachure area indicates that the tool
cuts in the workpiece.
To avoid this, the control performs an interference check when parameter INTERFER is set to 1.
Now the control will check that the condition -90°#n#+90° is fulfilled for angle n between the
programmed displacement and the one compensated with the radius.