Product Manual

GEAR TRAIN (FIG. F)
WARNING: Before making any of these adjustments, turn off and unplug the lathe from its power source.
The gear train is located on the headstock opposite the spindle. The drive gears are located under a cover secured
by two socket head cap screws. The gear train is used to drive the lead screw that allows the auto-feed function
to operate. As the gear train turns, it turns the lead screw which moves the carriage across the bed of the lathe.
13
OPERATION
THREADS PER INCH (TPI)
TPI
Gear Size (mm)
A B C D
12 40 65 / 30
13 40 65 60 30
14 40 65 / 35
16 40 65 / 40
18 40 65 / 45
19 40 50 60 57
20 40 65 / 50
22 40 65 / 55
24 40 65 / 60
26 40 60 / 65
28 20 65 / 35
32 20 65 / 40
36 20 65 / 45
38 20 50 60 57
40 20 65 / 50
44 20 65 / 55
48 20 65 / 60
52 20 60 / 65
METRIC THREAD PITCH
CHART
Pitch Gear Size (mm)
A B C D
0.4 20 50 40 60
0.5 20 50 / 60
0.6 40 50 30 60
0.7 40 50 35 60
0.8 40 50 40 60
1.0 20 60 / 30
1.25 50 40 / 60
1.5 40 60 / 40
1.75 35 60 / 30
2.0 40 60 / 30
The direction is set using the lead screw direction lever. Adjusting it to
forward will send the carriage towards the headstock. Reverse sends it
away, and neutral disengages the lead screw so the saddle can be manu-
ally fed.
The feed rate of the lead screw can be set by changing the gears in the
gear train (Fig. F). Switching the diameter of the gears and the order
of the gears will change the torque and speed of lead screw, allowing
for different threads to be turned with the lathe. The Threading Chart
to the right shows the gear arrangements to use to achieve different
threads per inch (TPI) or metric pitches when using the lead screw.
To change the gears to match up with these gear charts follow these
steps:
1. Remove the gear cover to expose the drive gears.
2. Loosen the adjustment nut at the bottom of the gear train to disen-
gage the gears from one another. Loosen the socket head cap screws
that hold each gear (or gear pair) on its shaft. Remove the necessary
gears and replace them with the appropriate gears. That is, the gears
that have the proper number of teeth in the positions called for (30, 40,
60, and 65 teeth). Note that some configurations do not require gears
in every position, and some require you to move the bushings from one
shaft to another for gears to properly fit in place.
3. Position the gears so their teeth will mesh together properly once the
adjuster is tightened.
ADJUSTER
A
B
C
D
Fig. F