Tool Support
The tool support (shown in Figure 5), is designed to allow adjustment for height, position on the bed, and angle to the work. Your 3520A lathe comes standard with the 14" tool support. Other supports are available; consult the "Optional Equipment" list on page 24.
Periodically the tool rest should be disassembled and the parts cleaned and oiled to provide free movement of the parts to insure good clamp action.
Spindle
The spindle bearing preload is set at the factory for general turning applications. There should be no "end play" of spindle looseness along its axis. If any looseness ever occurs it may be removed by tightening the bearing lock nut on the left end of the spindle. Be very careful not to overtighten the lock nut or the spindle bearings will overheat. It should be tightened just enough to remove the end play and the spindle should rotate very freely.
TABLE 1: WOOD TURNING LATHE SPEEDS
Speed Range Adjustment
To provide the maximum horsepower to the spindle at the very slow speeds, set the drive belt in the low range.
To change speed ranges, open the access door in front of the headstock, loosen the pivot lock handle located in the motor tension slot, raise the motor up by lifting up on the motor plate handle and relock the lock handle to hold the motor up. There should be sufficient slack in the belt to reposition it to the other step. Loosen the tension lock handle and lower the motor to tension the belt. Be sure that the
DIAMETER OF WORK | ROUGHING RPM | GENERAL CUTTING | FINISHING RPM | |
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Under 2" | 1520 | 3000 | 3000 | |
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2 to 4" | 760 | 1600 | 2480 | |
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4 to 6" | 510 | 1080 | 1650 | |
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6 to 8" | 380 | 810 | 1240 | |
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8 to 10" | 300 | 650 | 1000 | |
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10 to 12" | 255 | 540 | 830 | |
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12 to 14" | 220 | 460 | 710 | |
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14 to 16" | 190 | 400 | 620 | |
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16" to 20" | 175 | 325 | 500 | |
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20" to 24" | 175 | 260 | 400 | |
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