Adjusting Quill Retraction Lock; Changing Spindle Speeds - Jet JDP-15B Mode D'emploi

Rotate the scale ring (E, Fig 20) to zero. This sets the
workpiece surface as your zero reference point.
Move workpiece out from under bit.
Rotate the down feed handle until the scale ring reads your
desired depth.
Turn the stop ring (F) counter-clockwise until it stops moving.
Tighten the lock handle (G).
The drill bit will now advance only to this point.
Method 2:
Mark the desired depth of cut on the side of the workpiece.
Loosen the lock handle (G)
Lower the drill bit to the marked position (Fig 21).
Loosen the lock handle (G).
Turn the stop ring (F, Fig 20) counter-clockwise until it stops
moving.
Fig 19
Fig 20
Fig 21
Tighten the lock handle (G).
The drill bit will now advance only to this point.
Note:
For fine adjustment, slightly loosen lock handle (G) and
delicately further advance downfeed handle (D).
Retighten lock handle (G).

7.3 Adjusting quill retraction lock:

The quill can be held in the down position and prevented from
retracting, such as to facilitate removal of chuck and arbor.
Loosen the lock handle (G).
Rotate the down feed handle (D) to the desired depth.
Rotate lock ring (F, Fig 22) clockwise all the way until it stops.
Tighten lock handle (G)
The quill will stays in this position.

7.4 Changing Spindle Speeds

Open the pulley cover.
A spindle speed and belt arrangement chart (C, Fig 23) is
found on the inside of the pulley cover. Refer to this chart
whenever changing speeds.
Loosen knob (A) and move pull tensioner (B) away from belt
to release tension.
Change the belts location according the speed chart.
Make sure the belts are properly seated in the groves of each
pulley.
Fig 22
Fig 23