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25
Figure 43 – Spindle Clutch Adjustment
1. Make sure the lathe is OFF at the master
switch.
2. Remove the top cover of the headstock.
3. Determine the appropriate clutch.
4. Use a screwdriver to push in the index pin
(Figures 42 and 43). The pin is spring loaded.
5. Rotate the adjusting nut to the next index
position, which will be indicated by a “click.”
NOTE: The clutch reacts quickly; adjust clutch
nut by one division only. You must feel and
hear the clutch engagement – a clicking
sound. If clutch adjustment is too tight, it will
not engage.
If the spindle does not stop in the OFF
position, the forward/reverse clutch adjustment
is out of balance. (The spindle follows the
direction with the tighter clutch adjustment).
6. Reinstall headstock cover, and test the clutch
function.
NOTE: Never reverse the friction clutch for braking.
13.8 Aligning Tailstock to Headstock
Headstock and Tailstock have been aligned at the
factory and should not require attention. If future
adjustment should ever be needed, proceed as
follows. (Make sure that twist in the lathe bed is not
contributing to the problem – refer tosection
8.1,Leveling the Lathe.)
1. Fit a 12” ground, center-drilled, steel bar
between centers of the headstock and tailstock
(Figure 44).
2. Fit a dial indicator to the top slide and traverse
the center line of the bar. If it indicates a taper,
adjustment is needed.
3. Align the tailstock using the off-set screws at
front and back (see C, Figure 38) until the
tailstock is aligned.
Figure 44 – Tailstock/Headstock alignment
13.9 Spindle Bearings
The spindle system is supported by three bearings,
with the rear bearing serving as an auxiliary
support.
Any play of the spindle bearings has been adjusted
out by the manufacturer, so that radial and axial
run-out of the spindle is within tolerances. If play
develops in the future, adjust the bearings as
follows (see Figure 45):
1. Loosen nut (1). Then loosen lock ring and
loosen nut (2).
2. Adjust the play of front and middle bearings
using nuts (3) and (4).
3. After adjustment, tighten the nuts one by one.
4. Run the machine without load for at least two
hours, at highest speed. The temperature rise
should not exceed 70 degrees Celsius
(158°F). Otherwise, the machine must be
adjusted again.
Figure 45 – Spindle bearing adjustment
13.10 Speed Control
If the chain on the speed control mechanism of the
main drive becomes elongated and loose, the
position of the speed control dial may become
inaccurate.
Open the top cover of the headstock. Tighten the
chain using the adjusting screw (Figure 46).
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