Specifications

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CONCISE GUIDE FANUC 80
Example of external tapered thread cut 1” NPT (pitch 14 threads / inch) :
N17 T101 (Taper thread cut)
N18 G54
N19 G97 S800 M3
N20 G0 X33 Z6 M8
N21 G76 P010060 Q100 R0.02
N22 G76 X29.588 Z-17.343 P1161 Q250 F1.814 R-0..729
N23 G0 X150 Z100
To machine the tapered thread cut it is important to remember:
- Pitch F = 25.4 (comparison between mm and inches) / 14 (n° threads / inch) = 1.814 mm
- P is calculated by multiplying the pitch by 640 (1.814 x 640 = 1161)
- End of thread X refers to the final diameter 31.91 – [(0.64 x 1.814) x2] = 29.588
- The starting diameter to calculate R is that relating to the starting Z (in the example Z6); in this case
making the calculation with the aid of trigonometry, the result is X29.367,
- Therefore R Will be (30.451-31.91):2=-0.729