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12. Tighten the spanner nut an additional
along its circumference. See Figure 138 for
the example of this measurement.
Figure 138. Final spanner nut rotation.
13. Without allowing the inner spanner nut to
tighten any further, install and tighten the
outer spanner nut against the inner nut.
Do not overtighten the outer spanner nut
because additional preload can force the
bearings even tighter against the races in the
headstock and cause the headstock to com-
press, or crack, or cause bearing failure.
14. Re-install the outboard spindle cover.
-80-
⁄
1
16
⁄
" Travel
1
16
"
To confirm that the bearings are correctly pre-
loaded:
1.
Re-attach all removed lathe components and
prepare it for operation.
2.
Install the chuck and tighten the jaws.
3.
Set the spindle speed to its highest setting.
4.
Connect the lathe to power and turn the lathe
spindle ON.
5.
Let the lathe run for 20 minutes, periodically
shutting it down a few times and checking
temperature.
6.
Turn the spindle OFF, disconnect lathe from
power, and check the temperature of the
spindle.
—If the spindle nose is slightly warm to the
touch, you have correct bearing preload.
—If the spindle nose is hotter than you can
comfortably keep your hand on, the pre-
load is too tight and you must repeat bear-
ing preload adjustment procedure. When
repeating the procedure, rotate the inner
spanner nut a little less during Step 12 in
the preceding instructions.
Model G0750G (Mfd. Since 5/15)
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