AA-drill 77300 Manuel D'instructions page 21

Spindledepth adjustments for 77315 and 77320:
To stop drilling at desired depth, loosen half wing bolt (E)
located on feed pinion assembly, rotate fractional increments
to desired depth and tighten half wing bolt. To hold a
stationary depth, loosen half wing bolt (E), turn feed pinion to
lowest point, then rotate fractional increments to desired depth
and re-tighten half wing bolt. This will hold the spindle
assembly stationary at desired depth.
Drill chuck and arbor:
Slide small end of arbor into the chuck, place long end inside spindle, hold crank
table 5 inches from tip of spindle, open chuck completely, pull feed pinion down,
pressing the chuck against the table till arbor is secure.
Morse taper drill bits:
To use Morse taper bits, remove chuck and taper. To remove
taper and chuck, adjust stationary depth to 3 inches (see
depth instructions). Turn spindle manually lining up spindle
and quill key holes. Using key bar tap lightly until taper and
chuck fall out. Loosen half wing bolt and allow spindle
assembly to return to its original position.
Place tapered bit into the spindle hole, twisting and pushing
upward until bit is snug. Place a block of wood on the table and crank up table until
the tapered bit is firmly into the spindle.
Changing speeds (fig. 11):
Warning: disconnect the drill press from the power
source before making any adjustments.
1. Open the belt housing cover.
2. Turn the belt tension knob to loosen the motor
tension spring.
3. Pivot the motor toward the front of the drill press.
Hold the motor in this position and set the belt on
the desired steps of the motor and spindle pulleys
(fig. 12).
4. Pivot motor away from the drill press head to
increase the belt tension and tighten tension knob.
5. Close the belt housing cover.
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