THREADING DEPTH
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Features |
| Advantages |
Disadvantages |
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- Easy to use. (Standard programme for threading.)
- Superior resistance to vibration. (Constant cutting force.)
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- Long chips generated during the final pass.
- Complex calculation of cutting depth when changing the number of passes.
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- Reduced load on nose radius during the first half of the passes.
- Easy chip control.
(Optional setting of chip thickness)
- Easy to calculate cutting depth when changing the number of passes.
- Good chip control.
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- Subject to vibration in the later stages of cutting. (Increased cutting force)
- In some cases, changing the NC programme is necessary.
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- *
- It is recommended to set the depth of cut of the final pass to 0.05mm ─ 0.025mm.
Large cutting depths can cause vibration, leading to a poor surface finish.
FORMULAE
Formulae to calculate infeed for each pass in a reduced series.
NC PROGRAMME FOR MODIFIED FLANK INFEED
Example) M12×1.0 5 passes modified 5°
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