Page 119 - Threading_Handbook

Example
Pitch - 1.25 mm
Total depth of cut: ap=0.78 mm
Number of passes: na = 6

• Calculation depth of cut for 1 pass: THREAD TURNING
st
st
For 1 pass: C=0.3
∆ap(1) = 0.78 × √0.3 = 0.19
√6-1
st
Depth of cut for 1 pass: 0.19 mm
• Calculation depth of cut for 2 pass:
nd
nd
For 2 pass: C=1

∆ap(2) = 0.78 × √1 = 0.35
√6-1
nd
Depth of cut for 2 pass: 0.35-0.19=0.16 mm
• Calculation depth of cut for 3 pass:
rd
For 3 pass: C=3-1=2
rd
∆ap(3) = 0.78 × √2 = 0.49
√6-1
rd
Depth of cut for 3 pass: 0.49-0.35=0.14 mm
th
• Calculation depth of cut for 4 pass:
For 4 pass: C=4-1=3
th
∆ap(4) = 0.78 × √3 = 0.6
√6-1
Depth of cut for 4 pass: 0.6-0.49=0.11 mm
th
• Calculation depth of cut for 5 pass:
th
For 5 pass: C=5-1=4
th
∆ap(5) = 0.78 × √4 = 0.7
√6-1
th
Depth of cut for 5 pass: 0.7-0.6=0.1 mm
th
• Calculation depth of cut for 6 pass:
th
For 6 pass: C=6-1=5
∆ap(6) = 0.78 × √5 = 0.78
√6-1
Depth of cut for 6 pass: 0.78-0.7=0.08 mm
th

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