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Different thread in-feed methods are used when thread turning, with the most common method being the radial in-feed. This is the simplest and quickest method to produce the required thread.

The feed is perpendicular to the turning axis and both flanks of the insert produce a cutting action, in effect plunging onto the material.

When a thread pitch becomes finer (more than 16 threads per inch) a modified thread in-feed is required to avoid chatter, this is known as flank in-feed. This is used because the cutting edge would be too large using the radial method plunging in cutting with two edges. Flank in-feed cuts with only one edge.

On a lathe you can rotate the chuck both clockwise and anti-clockwise therefore left hand and right hand holders may be employed to produce left and right hand threads, both externally and internally. However, depending upon the thread form to be produced, an “Anvil” may need to be used to create clearance angles to prevent the insert cutting edge rubbing the workpiece.


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