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11. Tighten inner spanner nut an additional
along its circumference. See Figure 145 for
an example of this measurement.
Figure 145. Final spanner nut rotation.
12. Without allowing inner spanner nut to tighten
any further, install and tighten outer spanner
nut against inner nut (see Figure 146).
DO NOT overtighten outer spanner nut
because additional preload can force bear-
ings even tighter against races in the head-
stock and cause headstock to compress, or
crack, or cause bearing failure.
Figure 146. Outer spanner nut re-installed.
13. Re-install outboard spindle cover.
Model G0824 (Mfd. Since 12/16)
⁄
"
1
16
⁄
" Travel
1
16
Inner
Spanner Nut
Outer
Spanner Nut
To confirm bearings are correctly preloaded:
1.
Re-attach all removed lathe components and
prepare it for operation.
2.
Install chuck and tighten jaws.
3.
Set the spindle speed to its highest setting.
4.
Connect lathe to power and turn lathe spindle
ON.
5.
Let lathe run for 20 minutes, periodically
shutting it down a few times and checking
temperature.
6.
Turn spindle OFF, disconnect lathe from
power, and check temperature of spindle.
— If spindle nose is slightly warm to the
touch, you have correct bearing preload.
— If spindle nose is hotter than you can com-
fortably keep your hand on, preload is too
tight and you must repeat bearing preload
adjustment procedure. When repeating
the procedure, rotate the inner spanner
nut a little less during Step 12 in the pre-
ceding instructions.
-85-
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