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Standard Cutting Conditions and Infeed Methods

Threading guidelines

Determine the infeed per pass and number of threads whilst referring to the table and description below.

Pitch0.50.7511.251.51.7522.533.544.55 ~
TPI48322420161412108765.55 ~
No. of passes4 ~ 64 ~ 74 ~ 85 ~ 96 ~ 107 ~ 127 ~ 128 ~ 1410 ~ 1611 ~ 1811 ~ 1811 ~ 1912 ~ 24

Note:

  • When using the full-profile insert, set the total infeed amount by
  • The partial-profile insert or inside diameter insert has small nose

taking the finish stock of 0.1mm into account. R. Reduce the infeed per pass and increase the no. of passes.

  • Set the first infeed to 150 ~ 200% of nose R and do not allow it to
  • Regarding standard infeed per passes and no. of passes, please

exceed 0.5 mm. refer to our catalogue.

  • The infeed amount during the final pass must be a minimum of 0.05 mm. No zero cuts should be made. (Extra small infeed or zero cutting of work hardened surfaces will reduce tool life.)

Infeed methods for threading tools

Infeed method Features

  • Most simple and usual method

Suitable for relatively small pitch threads of easily machinable material.

  • Chip contact length on right and left is longer, causing chattering, with increased load on the nose end.
  • When the half included angle is not symmetrical to the right and left, infeeding in the direction of 1/2 of the included angle will ensure equal machining with right and left cutting edges.

Straight infeed (radial infeed)

  • Suitable for large pitch threads or easy to tear materials. Eff ectively prevents chattering.
  • Chips are discharged in one direction only. Satisfactory chip control.
  • Edge on the right (with zero infeed) tends to be worn heavily.

Single edge infeed (fl ank infeed)

  • Suitable for large pitch threads or easy to tear materials. Eff ectively prevents chattering.
  • Chips are discharged in one direction only. Satisfactory chip control.
  • Edge on the right performs some cutting, therefore

wear of this edge can thus be suppressed. Modifi ed single-edge infeed (fl ank infeed)

  • Suitable for large pitch threads or easy to tear material. Eff ectively prevents chattering.
  • Chips are discharged alternately in right and left directions, resulting possibly in entanglement.
  • Right and left edges are used alternately, ensuring uniform wear and extending tool life.

Alternating fl ank infeed