HUST CNC H6D-T - Page 96

HUST CNC H6D-T Manual
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Program Example 2: (Tapered thread cutting)
Cutting specifications: Pitch F = 2 mm,
Lead for start-of-cutting S1 = 2 mm,
Lead for end-of-cutting S2 = 2 mm,
Cutting depth = 1.4 mm (diameter), in 2 cutting
sessions
Fig.3-22 Tapered thread cutting
Tapered threads, for angle between taper plane and Z-axis less than 45°, pitch shall be
set along Z-axis, for angle between taper plane and Z-axis more than 45°, pitch shall be
set along X-axis.
N10 GO X60.0 Z100.0
N20 M03 S2000
N30 G0 X23.000 Z72.000 (First cutting 1.0/2mm)
N40 G34 X32.000 Z28.000 F2.00 K0.5
N50 G0 X40.000
N60 Z72.000
N70 G0 X22.600 (Second cutting 0.4/2mm)
N80 G34 X31.600 Z28.000 F2.00 K0.5
N90 G0 X40.000
N100 Z72.000
N110 M05
N120 M02
Multi-stage thread cutting with variable-pitches
As shown in Fig.3-21, the first 2 stages are variable-pitch threads with F=1.0mm,
X
Z
40
33
2
2
24
30 40