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Technical Information

Laydown Threading

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Laydown Threading Shim Selection Guidelines

It is essential to select the correct shim to ensure thread quality and

maximum tool life. These parameters are needed:

• Pitch

• Pitch diameter

• Number of starts

• Feed direction

NOTE: When considering method of thread cutting, the part’s shape and stability

and the ow of chips are determining factors in your decision.

Laydown Selection Chart

pitch (mm)

RH thread/RH tooling

10 —

9—

8—

7—

6—

5—

4—

3—

2—

1—

0—

1—

2—

3—

4—

5—

6—

7—

8—

9—

10 —

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:

= thread lead angle

P•S De = effective pitch diameter of thread wear

= Arctan

P = 1/TPI

/ De TPI = threads per inch

S = number of starts

single-start, lead = pitch

multiple-start, lead = pitch (x) number of starts

LH thread/LH tooling

RH thread/LH tooling

All toolholders are designed with an inclination

angle = 1.5°. When turning standard threads with

a lead angle of 1–2°, this guarantees adequate

clearance at the flanks of the insert’s thread

tooth. The thread lead angle and the required

inclination angle of the insert are given by .

Cutting edge height is constant at every shim

and insert combination. All toolholders are

supplied with 1-1/2° lead angle.

F100

zakaz@widiahanita.ru

WIDIA - Полный каталог инструмента - 2017