CNC Lathe | G32 Code | Constant Lead Threading

In this article, we describe how to use G32 cycle for threading in CNC lathe machines with all details and examples.

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Constant Lead Threading Cycle Introduction

Tapered screws and scroll threads in addition to equal lead straight threads can be cut by using a G32 command.

The spindle speed is read from the position coder on the spindle in real time and converted to a cutting feedrate for feed-per minute mode, which is used to move the tool.

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CNC Thread Types

G32 Code Format

 

G32 IP_ F_;

Parameters

IP_: End point
F _: Lead of the long axis
(always radius programming)

G32 Cycle Examples

Example – 1 – Straight Threading Example

CNC Lathe Straight Threading Example

The following values are used in programming :
Thread lead :4mm
δ1=3mm
δ2=1.5mm
Depth of cut :1mm (cut twice)
(Metric input, diameter programming)

G00 U-62.0 ;
G32 W-74.5 F4.0 ;
G00 U62.0 ;
W74.5 ;
U-64.0 ;
(For the second cut, cut 1mm more)
G32 W-74.5 ;
G00 U64.0 ;
W74.5 ;

Example – 2 – Tapered Threading Example

CNC Lathe Tapered Threading Example

The following values are used in programming :
Thread lead : 3.5mm in the direction of the Z axis
δ1=2mm
δ2=1mm
Cutting depth in the X axis direction is 1mm (cut twice)
(Metric input, diameter programming)

G00 X 12.0 Z72.0 ;
G32 X 41.0 Z29.0 F3.5 ;
G00 X 50.0 ;
Z 72.0 ;
X 10.0 ;
(Cut 1mm more for the second cut)
G32 X 39.0 Z29.0 ;
G00 X 50.0 ;
Z 72.0 ;


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