Общий каталог Widia 2017

It is essential to select the correct shim to ensure thread quality and maximum tool life. These parameters are needed:

NOTE: When considering method of thread cutting, the part’s shape and stability and the ﬂ ow of chips are determining factors in your decision.

pitch (mm)

RH thread/RH tooling LH thread/LH tooling

10 — 9 — 8 — 7 —

6 — 5 — 4 — 3 — 2 — 1 — 0 — 1 — 2 — 3 — 4 — 5 — 6 — 7 — 8 — 9 — 10 —

		RH thread/LH tooling LH thread/RH tooling
	pitch (mm)
NOTE: For multi-start threads, use the lead value instead of the pitch.
Diagram of Thread Lead Angles
To calculate the lead angle of a given thread, use this formula:		All toolholders are designed with an inclination
		angle = 1.5°. When turning standard threads with
		a lead angle of 1–2°, this guarantees adequate
	ß = thread lead angle	clearance at the fl anks of the insert’s thread
		tooth. The thread lead angle and the required
	De = effective pitch diameter of thread wear	inclination angle of the insert are given by ß.

P•S ß = Arctan P = 1/TPI / De Cutting edge height is constant at every shim TPI = threads per inch and insert combination. All toolholders are

supplied with 1-1/2° lead angle. S = number of starts single-start, lead = pitch multiple-start, lead = pitch (x) number of starts

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