Delta DP350 Instruction Manual download pdf (Page 12)

To avoid damaging the drive belts and

pulleys, DO NOT turn speed control handles (A) Fig. 24

unless the motor is running. Turn the handles (A) clockwise

to increase speed and counter-clockwise to decrease speed.

The speed range is 500 rpm to 3100 rpm.

When you need to drill a number of holes to the same

depth, use the stop nut (A) Fig. 25 on the threaded stop

rod (B).

1. Insert a bit in the chuck.

2. Lower the chuck (C) Fig. 25 to your depth. Tighten the quill locking lever (E).

NOTE: The Quill-locking lever (E) Figs. 25 and 26 is spring-loaded and can be repositioned. Pull out on the handle, position

it on the hub (D), and allow the handle to go back in.

3. Depress the spring-loaded button (F) Fig. 25, and move the stop nut (A) until the bottom of the nut (A) contacts the stop

(G). Hold the pinion shaft handle and loosen quill-locking lever (E). Rotate the pinion shaft handles to return the chuck

and quill to the "up" position.

4. Place the workpiece on the drill press table. Raise the drill press table until the workpiece touches the drill bit.

5. Drill a test hole to check the depth. Readjust if necessary by rotating the stop nut (A) Fig. 25 for fine adjustment. You will

not have to depress the button (F) while rotating the stop nut (A) for fine adjustment.

QUILL ADJUSTMENTS

Raise or lower the spindle by using the pilot wheel (A) Fig. 26. You can lock the quill (B) at any desired point in its travel by

tightening the quill locking lever (E).

VARIABLE SPEED CONTROL

DRILLING HOLES TO DEPTH

Disconnect the machine from the

power source!

ADJUSTING SPINDLE-RETURN SPRING

Even though the spindle automatically returns to the "up" position when the handle is released, you will protect your machine

by allowing the head to return slowly. The spindle-return spring was adjusted at the factory and should not need adjusting.

However, if necessary, to adjust:

1. Loosen the nuts (B) and (E) Fig. 27. Ensure that the spring

housing (A) stays engaged with head casting.

2. While FIRMLY HOLDING the spring housing (A Fig.

27, pull out the housing and rotate it until the boss (D)

is engaged with the next notch on the housing. Turn the

housing counter-clockwise to increase or clockwise to

decrease spring tension. Turn the nut (E) until it contacts

the spring housing (A), then back the nut (E) out a 1/4 turn

from the spring housing (A). Tighten the nut (B) against the

nut (E), to hold the housing in place.

IMPORTANT: Do not allow the inside nut (E) to contact the

spring housing (A) when tightened.

Disconnect the machine from the power source!

Fig. 24

Fig. 25 Fig. 26

Fig. 27

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Delta DP350 Instruction Manual Page 12

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