Sharp 16 Series Manual page 34

The objective is to locate and isolate the problem
NOISE IN HEADSTOCK/GEARBOX:
Note: 85 % of noise normally comes from the output shaft pulley.
1. Run lathe with all controls in neutral to see if the problem is in the spindle.
a. If the problem is in the spindle and the finish is good, the source is most likely
in the rear bearing (Part #65). However if the finish is poor the problem could
be the front bearings are either loose or damaged.
b. If the problem is not in the spindle, continue by engaging one control at a time
until the problem is found. (Figure 1)
c. If the problem is not in the headstock, and before you continue to the gear box,
check the change gears (Parts #41, 78 & 89) located on the back of the
headstock for proper backlash and alignment. (Figure 2) If these gears are
found to be in good working order, perform the same sequence as above on the
gearbox. (engage one control) at a time until the problem is located. (Figure 3)
d. Once you determine the problem is either in the gearbox or the headstock, that
part of the machine must be opened up to inspect for possible worn or broken
parts.
2. If the gearbox is in order and the feed or lead screws are not turning check the
shear pins. (There are two shear pins on each shaft). (Figure 4)
Notes:
TROUBLESHOOTING
THE "C" MODEL LATHE
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