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

B-63324EN/03 PROGRAMMING 4.INTERPOLATION FUNCTIONS
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4.20 INCH THREADING (G33)
When a number of thread ridges per inch is specified with address E, an
inch thread can be produced with high precision.
Format
Example
Fig.4.20 (a) Inch threading
G33 IP_ E_ Q_;
E_ : Number of thread ridges per inch
Q_ : Number of thread ridges per inch at threading start angle
δ
2
X-axis
δ
1
70mm
Z-axis
Lead : Three ridges per inch ( = 8.4666……)
δ
1
= 3mm
δ
2
= 1.5mm
Depth of cut : 1 mm (Two cuts are made.)
The program is specified with the conditions above.
(Data is input in millimeters and the diameter is specified.)
G91 G33 Z-74.5 E3.0 ; (Three ridges per inch)
G00 X-10.0 ;
Z74.5 ;
X-11.0 ; (A cut of another 1mm is made during
the second pass.)
G33 Z-74.5 E3.0;
G00 X-10.0 ;
Z74.5 ;

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