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-16- G4002/3 Gear Head Lathes
Figure 14. Selector positioned for threads.
Figure 15. Thread pitch chart.
Inch thread selection:
To cut threads with inch pitches, a selection must
be made for feed direction, pitch and lead screw.
Select the desired direction of cut as described in
the section titled Feed Direction.
Rotate the Feed/Lead Screw selection lever to
the position shown in Figure 14. If the lever does
not readily engage, rotate the lead screw or the
chuck by hand while maintaining gentle pressure
on the lever.
While other thread pitches may be achieved, the
G4002/3 comes with a chart that requires no gear
changes for cutting inch threads.
To achieve a desired thread pitch in inches, it is
necessary to determine the quick-change lever
positions. Refer to Figure 15 and find the desired
thread.
Thread Selection
Example:
The thread to be cut has 20 threads per inch
(TPI). Looking at the chart we find that the left
hand lever would be positioned at “C”. The right
hand lever would be positioned at “4”.