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Model G0768/G0769 (Mfd. Since 8/15)
The following subsections describe how to use
the threading controls and charts to set up the
lathe for a threading operation. If you are unfamil-
iar with how to cut threads on a lathe, we strongly
recommend that you read books, review industry
trade magazines, or get formal training before
attempting any threading projects.
Headstock Threading Controls
The threading chart on the headstock face dis-
plays the settings for inch and metric threading.
Using the controls on the lathe, follow the exam-
ple below to understand how to set up the lathe
for the desired threading operation.
Threading
To set lathe to thread 20 TPI right-hand
threads:
1. Configure gears as instructed in End Gear
Configuration Example on Page 53.
2. Place the top V-belt in the A position for low
(50-1000 RPM), as shown in Figure 94.
8. Adjust lash between meshed gears so it is
approximately 0.003", then tighten the gear
shafts.
9. Swing the adjuster up and mesh the 84T gear
with the spindle gear.
10. Secure the adjuster cap screw.
11. Re-install end gear cover. The lathe is now
set for a power feed rate of 0.0037 in./rev.
Feed Direction Dial
LEFT
(For LH threads)
RIGHT
(for RH threads)
CENTER
(Neutral)
Figure 95. Feed direction dial setting.
Feed
Direction
Lever
3. Move the feed direction dial to the right (see
Figure 95). The lathe is now set up to cut 20
TPI threads.
Figure 94. Top V-belt in "A" position.
A
B
M
Low
High
Top
V-Belt