Fanuc Series 15i/150i-MA (Programming) Operators Manual

B-63324EN/03 PROGRAMMING 14.COMPENSATION FUNCTION
- 437 -
Interference avoidance function
- Overview
Upon the issue of a command that satisfies a condition under which an
interference alarm (PS272) is displayed by the interference check
alarm function, selecting the interference avoidance function
suppresses the interference alarm. Instead, it calculates a new
compensation vector to enable machining to continue. On a tool path
where interference is avoided, however, the cutting will become
insufficient. In addition, a tool path for interference avoidance cannot
be produced for some specified figures or may be judged as being
dangerous. In these cases, an alarm is displayed, and tool movement is
stopped. Because of this, interference avoidance is not necessarily
available for all commands.
- Interference avoidance method
Let us examine the interference that occurs between the compensation
vector between blocks 1 and 2 and the compensation vector between
blocks N-1 and N. A direction vector from the end point of block 1 to
that of block N-1 is called a gap vector. For interference avoidance, a
post-compensation intersection vector between blocks 1 and gap vector
is produced. A post-compensation intersection vector between the gap
vector and block N is also produced. Then, a path connecting these
vectors is generated.
Movement specified
in block 7
Post-compensation
intersection vector between
block 1 and gap vector
Post-compensation intersection
vector between gap vector and
block 8
Post-compensation
path
Block
1
Block
8
Block 2
Block
7
Block 3
Block
6
Block
4
Block
5
In this case, the post-compensation end point for blocks 2 to 6 coincides with
that of block 1. So, blocks 2 to 6 do not involve movement after
compensation.

Leave a Reply

Your email address will not be published. Required fields are marked *