Basic thread cutting instruction FANUC-0T CNC lathe programming (Figure)

Figure 1 cylindrical thread cutting

The basic thread cutting method is shown in Figure 1.
Programming format G32 X(U)~ Z(W)~ F~

In the formula:

X(U), Z(W) - the end point coordinate value of thread cutting; when X is omitted, it is cylindrical thread cutting, when Z is omitted, it is end face thread cutting; when X and Z are not omitted, it is taper thread cutting; (X coordinate value is based on "Mechanical Design Manual" table check)
F - Thread lead.

For thread cutting, it should be noted that sufficient speed-increasing infeed section δ1 and deceleration retracting section δ2 are set at both ends.

Example: Try to write the machining program for the thread shown in Figure 3.42. (Thread lead 4mm, speed-increasing infeed section δ1=3mm, speed-retracting section δ2=1.5mm, thread depth 2.165 mm).
......
G00 U-62
G32 W-74.5 F4
G00 U62
W74.5
U-64

G32 W-74.5
G00 U64
W74.5
......

Figure 2 Taper thread cutting

Example: Try to write the machining program for the tapered thread shown in Figure 2. (Thread lead 3.5mm, speed-increasing infeed section δ1=2mm, speed-retracting section δ2=1mm, thread depth 1.0825 mm).

G00 X12
G32 X41 W-43 F3.5
G00 X50
W43
X10
G32 X39 W-43
G00 X50
W43

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