Lathe Speeds - Grizzly G9729 Instruction Manual

Lathe Speeds

The speed of the lathe is controlled by the posi-
tions of the belts on the pulleys. The chart in
Figure 34 shows the various combinations of belt
positions for achieving a range of six speeds.
Always disconnect the power to the machine
before making adjustments, set-up changes
or cleaning. Failure to do so could result in
injury to yourself and others.
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Figure 34. Lathe speed chart.
Example:
To select a spindle speed of 160 RPM, refer to
Figure 34.
To change belt position:
1. Unplug the lathe/mill!
2.
Loosen the tensioning lock lever on the back
of the lower belt guard (see Figure 35).
3. Allow the middle pulley and the shaft it is
mounted on, to slide downward along the slot
on the back of the belt guard. This will relax
the tension of the V-belts.
-34-
4.
5.
6.
Check the tension of the V-belts. They should
deflect
half way between the pulleys. If more deflection
is present, re-tension the V-belts as in Step 5.
DO NOT over tension the V-belts. Frequent over
tensioning will result in premature bearing wear.
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Move the V-belts to the A and F positions.
Pull the middle pulley and shaft back up the
slot to tension the V-belts.
Tighten the lock lever.
⁄ " with moderate finger pressure applied
1
2
Tensioning Lock Lever
Figure 35. Lock lever to adjust pulley.
G9729 Combination Lathe/Mill