Mitsubishi CNC Milling | G33 Code | Constant Lead Thread Cutting

In this article, we describe how to use G33 code for constant lead thread cutting in Mitsubishi CNC controlled milling (machine centre) machines with all details and examples.

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G33 Code Introduction

The G33 code exercises feed control over the tool which is synchronized with the spindle rotation and so this makes it possible to conduct constant-lead straight thread-cutting, and tapered thread-cutting. Multiple thread screws, etc., can also be machined by designating the thread cutting angle.

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G33 Code Format

Normal Lead Thread Cutting

G33 Z__(X__ Y__ α__) F__ Q__ ;

Parameters

Z (X Y α) : End point of thread cutting
F : Lead of long axis (axis which moves most) direction
Q : Thread cutting start shift angle (0.001 – 360.000°)

Precision Lead Thread Cutting

G33 Z__(X__ Y__ α__) E__ Q__ ;

Parameters

Z (X Y α) : End point of thread cutting
E : Lead of long axis (axis which moves most) direction
Q : Thread cutting start shift angle (0.001 – 360.000°)

G33 Code Example


N110 G90 G00 X-200. Y-200. S50 M3 ; The spindle center is positioned to the workpiece center, and the spindle rotates in the forward direction.
N111 Z110 ; 
N112 G33; Z40 F6.0; The first thread cutting is executed. Thread lead = 6.0mm
N113 M19 ; Spindle orientation is executed with the M19 command.
N114 G00 X-210.; The tool is evaded in the X axis direction.
N115 Z110. M0 ; The tool rises to the top of the workpiece, and the program stops with
M00. Adjust the tool if required.
N116 X-200. M3 ; Preparation for second thread cutting is done.
N117 G04 X5.0 ; Command dwell to stabilize the spindle rotation if necessary.
N118 G33 Z40.; The second thread cutting is executed.


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