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X+
Z+
The axis movements above are possible by the special processing for the tool nose radius
compensation function. Let's consider the operation in this program in the light of section 1-7.
"Path of Tool Nose "R" Center in Tool Nose Radius Compensation Mode."
a.
The center of the tool nose R (N2') at point N2 is obtained as follows:
•
The line parallel to the straight line N1 - N2 is obtained, with an upward offset (G42) by
the tool nose radius amount effective at N1.
•
The line parallel to the straight line N2 - N3 is obtained, with an upward offset (G41) by
the tool nose radius amount effective at N2.
•
The center of the tool nose R is obtained as the point of intersection of the two straight
lines obtained in steps in 1) and 2). However, since those two lines are parallel to each
other, no point of intersection is obtained in this case. For such case, the control has a
special processing feature in which the positioning is carried out so that the tool nose
R comes into contact with point N2. Therefore, the path of the tool nose R center,
when the cutting tool advances from point N1 to point N2, is obtained as N1' - N2'.
b.
The center of the tool nose R (N3') at point N3 is obtained in the same manner as in 1).
In this way, the program on the previous page can return the cutting tool along the same
straight line with the tool nose radius compensation function active.
If any of these three points is not precisely located on the same straight line, the tool path
will be shifted considerably from the expected path.
•
Two lines making an acute angle
In the figure below, although positioning from N1 to N2 is intended, the cutting tool cannot reach
point N2. This is because it can move only up to the point where the tool nose R comes into
contact with line N2 - N3.
X+
Z+
N2
This example illustrates a case where programmers are apt to be confused. Another example
is provided below.
N2'
N3'
N2
N3
SECTION 6 OFFSET FUNCTION
N1'
N1
N3
N1
5238-E P-68
LE33013R0300800100002
LE33013R0300800100003
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