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_ ;|
|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 ;