HUST CNC H6D-T - Page 97

3 G/M Codes
3 - 35
K=0.5mm; the transition from first stage to second stage is a smooth connection;
threads of the third stage have an equal pitch F=3.0mm, the transition from second stage
to third stage is a smooth connection.
Fig.3-23 Multi-stage thread cutting with variable pitches
Program Example 3
T03
M03 S1000
M08
G00 X0.0 Z0.0 ; Quick positioning to start point
G34 Z-30.0 F1.0 K0.5 ; Thread of first stage with variable pitch
G34 Z-50.0 F1.0 K0.5 ; Thread of second stage with variable pitch
G32 Z-60.0 F2.0 ; Thread of third stage with equal pitch
M09
M05
M30
If set as above, the thread cutting process will have no stop in Z-axis during thread
cutting, therefore the cut threads are smooth and continuous.
The transition from 1
ST
stage to 2
n
d
stage is a smooth connection.
The transition from 2
n
d
stage to 3
r
d
stage is a smooth connection.