Okuma OSP-P200L Programming Manual page 83

necessary for the tool tip circle to fit in. In addition, because X words are expressed as
diameters, the X word data has to be doubled. That is, the numerical value in such an X word
must be larger than four times the tool nose R.
If a value smaller than the required amount is used, it might cause the cutting tool to move in
the opposite direction toward point N21 and cut into the N1 - N2 surface.
Example of improved program 2 (using G40):
N1 G42 G01 X100
N2
N3 G40 G00 X300
X+
The G40 command in N3 cancels the tool nose radius function. At point N2, the cutting tool
moves so that the tool nose R contacts the line N1 - N2 and the vector I10 extending from point
N2.
•
Two lines making an obtuse angle
Consider the case where the cutting tool is fed along the path N0 - N1 - N2 - N3 - N4 in the
figure below.
Angle N2N3N4 is an acute angle and the cutting tool moves along the line outside of that angle.
Therefore, the cutting tool is moved to a point some distance from the workpiece at point N3.
When preparing a program in which cutting similar to this contour is required, it is necessary to
check the safety of tool motion and ensure that the tool does not strike against obstacles when
moving to such a distant point.
N 4
N 2
N 1
Z100 F0.2 S1000
Z50
Z300 I10 M05
I 10
Z+
SECTION 6 OFFSET FUNCTION
T010101 M03
N 3
N 2
N 3
X +
N 0
5238-E P-70
N 1
LE33013R0300800100006
Z +
LE33013R0300800100007