CNC | G34 Code | Variable Lead Threading (Quick Guide)

In this article, we describe how to use G34 code for variable lead threading in CNC lathe machines with all details and examples.

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Overview

Specifying an increment or a decrement value for a lead per screw revolution enables variable lead threading to be performed.

G34 Code Format

G34 IP_ F_ K_ Q_ ;

Parameters

IP_ : End point
F_ : Lead in longitudinal axis direction at the start point
K_ : Increment and decrement of lead per spindle revolution
Q_ : Shift amount of starting angle of thread cutting

Address other than K are the same as in straight/taper thread cutting with G32.

G34 Code Example

Lead at the start point: 8.0 mm
Lead increment: 0.3 mm/rev
G34 Z-72.0 F8.0 K0.3 ;


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