Thread Turning Overview

The full profile for Fine Pitches will form a complete thread. The topping of the outer diameter is generated by the second tooth.

Applications:
•For fine pitches (smaller than 0.5 mm)
Advantages:
•Very small crest radius – Achieved with 2nd tooth
Disadvantages:
•Blind hole limitation – Last pitch not complete

The full profile insert will form a complete thread profile including the crest. For every thread pitch and standard, a separate insert is required.
Advantages:
•Precision- Profile precisely according to standard
•Quality - Smooth and perfect thread (no burrs)
Disadvantages:
•Specific Solution - Each pitch & standard require different inserts

The full profile for Fine Pitches will form a complete thread. The topping of the outer diameter is generated by the second tooth.
Applications:
•For fine pitches (smaller than 0.5 mm)
Advantages:
•Very small crest radius – Achieved with 2nd tooth
Disadvantages:
•Blind hole limitation – Last pitch not complete

The Semi full profile insert will form a complete thread including crest radius but without topping the outer diameter. Mainly used for trapezoidal profiles.
Applications:
•For large Trapez profiles
Advantages:
•No Chatter - Reduced load, shoulders relief
•Quality - Smooth and perfect thread (no burrs)
Disadvantages:
•Additional Operations – Additional turning necessary for finishing thread crest

Recommended For IC 3/8”

Flank infeed is recommended in the following cases:
• When the thread pitch is greater than 16 TPI, using the radial method, the effective cutting edge length is too large, resulting in chatter.
• For TRAPEZ and ACME. The radial method result in three cutting edges, making chip flow very difficult.

Recommended For IC 1/2”

Radial infeed is the simplest and quickest method.
The feed is perpendicular to the turning axis, and both flanks of the insert perform the cutting operation.
Radial infeed is recommended in 3 cases:
• When the pitch is smaller than 16 TPI
• For material with short chips
• For work with hardened material

Use of the alternate flank method is recommended especially in large pitches and for materials with long chips. This method divides the load equally on both flanks, resulting in equal wear along the cutting edges. Alternate flank infeed requires more complicated programming, and is not available on all lathes.