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JIS PRML

Z-PRO

Premium Thread Mills

Specification

Coating <2D

Product Features

  • The same PRML can process right and left hand internal threads by using the helical interpolating process.
  • Because it cuts at the first thread, it won't make the internal threads taper and the internal threads become highly accurate.
  • When cutting, the load on the tool is small and the tool life is long.
  • Cutting resistance is reduced by turning the tool counterclockwise and machining it from the top to the bottom with 1 pass cutting.

Cutting Data

Processing Conditions［9.0P1.75-M12 M12×1.75］ Pitch diameter change graph

Workpiece MaterialSCM440（30HRC）
Cutting Speed100m/min
Feed per Tooth0.06mm/t
Cutting Length24mm
Bored Hole Sizeφ10.3
Number of Passes1Time
Machinery TypeTapping center (BT 30)
Cutting FluidWater soluble cutting fluid, 20 to 1 dilution

10.94 10.92 10.9 10.88

10.82 10.8

Use the internal coolant supply for blind hole applications. Internal Coolant External Coolant Supply Supply

PRML

Conventional product * Dimensions Longer Tool Life

(Number of holes processed)

Instructions Processing Conditions:

Workpiece MaterialCutting Speed （m/min）Feed per Tooth fz （mm/t）
Thermal refined steel 35～ 45HRC40 ～1000.02 ～0.05
Thermal refined steel 25～ 35HRC40 ～1000.03 ～0.06
Cast Iron FC40 ～1000.02 ～0.05
Ductile Cast Iron FCD40 ～1000.02 ～0.05
Alloy Steel SCM40 ～1000.04 ～0.06
High Carbon Steel S45C～40 ～1000.04 ～0.06
Medium Carbon Steel S25C～ S45C60 ～1000.03 ～0.05
Low Carbon Steel ～ S20C ／SS40060 ～1000.03 ～0.05

The program can be created from our web site.

② ③ ④ ⑤

Z Axis Back ◇ Tool feed speed calculation formula

to Z Axis Feed speed (mm/min) = fz x No. of flutes x Revolution speed x

center (Nominal dia. of internal thread - Cutter dia. (Dc)) / Nominal dia. of internal thread