MITSUBISHI MATERIALS CORPORATION
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THREADING METHOD

THREADING DEPTH
  Features
  Advantages Disadvantages
Fixed cut area
Fixed cut area
  • Easy to use. (Standard programme for threading.)
  • Superior resistance to vibration. (Constant cutting force.)
  • Long chips generated during the final pass.
  • Complex calculation of cutting depth when changing the number of passes.
Fixed cutting depth
Fixed cutting depth
  • Reduced load on corner 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.
  • Subject to vibration in the later stages of cutting. (Increased cutting force)
  • In some cases, changing the NC programme is necessary.

FORMULAE
Formulae to calculate infeed for each pass in a reduced series.
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NC PROGRAMME FOR MODIFIED FLANK INFEED
Example) M12×1.0 5 passes modified 5°
External Threading Internal Threading
G00 Z = 5.0
        X = 14.0
G92 U─4.34 Z─13.0 F1.0
G00 W─0.07
G92 U─4.64 Z─13.0 F1.0
G00 W─0.06
G92 U─4.88 Z─13.0 F1.0
G00 W─0.05
G92 U─5.08 Z─13.0 F1.0
G00 W─0.03
G92 U─5.20 Z─13.0 F1.0
G00
G00 Z = 5.0
        X = 10.0
G92 U4.34 Z─13.0 F1.0
G00 W─0.07
G92 U4.64 Z─13.0 F1.0
G00 W─0.05
G92 U4.84 Z─13.0 F1.0
G00 W─0.04
G92 U5.02 Z─13.0 F1.0
G00 W─0.03
G92 U5.14 Z─13.0 F1.0
G00
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