·128·
Operating manual
CNC 8055
CNC 8055i
3.
WORKING WITH OPERATIONS OR CYCLES
·TC· OPTION
SOFT: V02.2X
Threading cycle
Fine pitch Whitworth thread: B.S.F
The threads must be defined in mm or inches. For example, to define a Whitworth thread with a 3/16
pitch, enter 4.7625 mm or 0.1875 inches.
The CNC calculates the pitch and the depth with the formulae:
Pitch in mm = 25.4 / number of edges
Pitch in inches = 1 / number of edges
Depth in internal threads = 0.6403 x Pitch
Depth in external threads = 0.6403 x Pitch
Thread Step Depth (mm)
(mm) (inches) Edges (mm) (inches) Internal External
3/16 4.7625 0.1875 32 0.7937 0.0312 0.5082 0.5082
7/32 5.5562 0.2187 28 0.9071 0.0357 0.5808 0.5808
1/4 6.3500 0.2500 26 0.9769 0.0385 0.6255 0.6255
9/32 7.1437 0.2812 26 0.9769 0.0385 0.6255 0.6255
5/16 7.9375 0.3125 22 1.1545 0.0455 0.7392 0.7392
3/8 9.5250 0.3750 20 1.2700 0.0500 0.8132 0.8132
7/16 11.1125 0.4375 18 1.4111 0.0556 0.9035 0.9035
1/2 12.7000 0.5000 16 1.5875 0.0625 1.0165 1.0165
9/16 14.2875 0.5625 16 1.5875 0.0625 1.0165 1.0165
5/8 15.8750 0.6250 14 1.8143 0.0714 1.1617 1.1617
11/16 17.4625 0.6875 14 1.8143 0.0714 1.1617 1.1617
3/4 19.0500 0.7500 12 2.1167 0.0833 1.3553 1.3553
13/16 20.6375 0.8125 12 2.1167 0.0833 1.3553 1.3553
7/8 22.2250 0.8750 11 2.3091 0.0909 1.4785 1.4785
1 25.4000 1.0000 10 2.5400 0.1000 1.6264 1.6264
1 1/8 28.5750 1.1250 9 2.8222 0.1111 1.8071 1.8071
1 1/4 31.7500 1.2500 9 2.8222 0.1111 1.8071 1.8071
1 3/8 34.9250 1.3750 8 3.1750 0.1250 2.0330 2.0330
1 1/2 38.1000 1.5000 8 3.1750 0.1250 2.0330 2.0330
1 5/8 41.2750 1.6250 8 3.1750 0.1250 2.0330 2.0330
1 3/4 44.4500 1.7500 7 3.6286 0.1429 2.3234 2.3234
2 50.8000 2.0000 7 3.6286 0.1429 2.3234 2.3234
2 1/4 57.1500 2.2500 6 4.2333 0.1667 2.7106 2.7106
2 1/2 63.5000 2.5000 6 4.2333 0.1667 2.7106 2.7106
2 3/4 69.8500 2.7500 6 4.2333 0.1667 2.7106 2.7106
3 76.2000 3.0000 5 5.0800 0.2000 3.2527 3.2527
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