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7.
Thread the three M6-1 x 25 cap screws into
the gears so the cap screws act as guide
dowels allowing the gears to slide together
without binding. Do not use a hammer to seat
the gear.
8.
Press the two gears together and tighten the
three cap screws (Figure 59).
9.
Remove the 57-tooth gear (Figure 57).
10. Slide the 42-tooth gear onto the lower spin-
dle, install the shoulder washer on the spindle
so the shoulder faces the gear (Figure 60),
and install the cap screw.
Figure 60. Shoulder washer positioning.
11. Using the 6mm hex wrench, remove the
upper spindle cap screw, spacer washer, the
48-tooth gear, and the spacer (Figure 57).
12. With the shoulder of the 48-toothed gear
facing the bearing seal (Figure 61), slide
the gear back onto the shaft, then install the
spacer, spacer washer and cap screw.
Shoulder
Figure 61. Upper spindle gear positioning.
G0600 20" x 60" Big Bore Lathe
Shoulder
Seal
13. Using a 24mm wrench, loosen the adjust-
ment arm locknut (Figure 62), and let the
adjustment arm swing away.
Center
Gear
Assembly
Center
Spindle
Figure 62. Center gear adjustment arm.
14. Install the center gear and spindle onto the
adjustment arm, then finger tighten the spin-
dle.
15. Move the center gear and adjustment arm
assembly, then tighten the spindle and adjust-
ment arm lock nut so all gears mesh and
have 0.0015" to 0.004" of backlash.
16. Rotate the gears by hand to make sure no
binding occurs, and then paint the gear teeth
with general purpose automotive grease.
17. When you are finished, make sure the gear
arrangement matches the (W) mode arrange-
ment shown in Figure 56.
18. Close the side cover and refer to the
Threading Chart on Page 40 for how to shift
your lathe to the appropriate feed or thread
pitch.
Adjustment
Arm and
Locknut
-43-
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