Assessments - 3, GPA: 4.3
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1. Insert bit into chuck. 2. Lower the chuck (C) Fig. 25, to the depth you wish the holes to be drilled. Then lock the quill in position by tightening quill locking lever (E). NOTE: Quill locking lever (E) is spring-loaded and can be repositioned by pulling out on the handle and repositioning the hub of the handle on the bolt located underneath the hub. 3. Depress spring-loaded button (F) Fig. 25, and rapidly move stop nut (A) until bottom of nut (A) contacts stop (G). Then hold the pinion shaft handle and loosen quill locking lever (E), the chuck and quill will return to the up position by gradually allowing the pinon shaft handles to rotate to the return position. 4. Place the material to be drilled on the drill press table. Raise the drill press table until the material to be drilled just touches the drill bit. 5. Drill a test hole to check the depth and readjust if necessary by rotating stop nut (A) Fig. 25, for fine adjustment. It is not necessary to depress button (F) while rotating stop nut (A) for fine adjustment. QUILL ADJUSTMENTS The spindle is raised and lowered by means of the pilot wheel (A) Fig. 26. The quill (B) can be locked at any desired point in its travel by tightening the quill locking lever (C). NOTE: The quill locking lever (C) is spring- loaded and the handle can be repositioned by pulling out on the handle (C) and repositioning the hub (D) of the handle on the bolt located underneath the hub. A C E F G Fig. 25 A B C D Fig. 26 12 ADJUSTING SPINDLE RETURN SPRING The spindle is automatically returned to its upper most position when the handle is released. It is recommended that the handle be allowed to slowly return to the top position after each hole has been drilled in the material. This spring has been properly adjusted at the factory and should not be disturbed unless absolutely necessary. To adjust the return spring, proceed as follows: DISCONNECT MACHINE FROM POWER SOURCE. 1. Loosen nuts (B) and (E) Fig. 27. Make sure spring housing (A) stays engaged with head casting. 2. While FIRMLY HOLDING spring housing (A) Fig. 27 pull out housing and rotate it until boss (D) is engaged with the next notch on the housing. Turn the housing counterclockwise to increase or clockwise to decrease spring tension. Turn nut (E) until it contacts spring housing (A), then back nut (E) out a 1/4 turn from spring housing (A). Tighten nut (B) against nut (E), to hold the housing in place. IMPORTANT: Inside nut (E) should not contact spring housing (A) when tightened. A D E B Fig. 27 OPERATION Your drill press is to be used with drill bits with a shank of 1/2" or less in diameter. The following will give the inexperienced operator a start on common drill press operations. Use scrap material for practice to get a feel of the machine before attempting regular work. The use of accessories and attachments not recommended by Delta may result in risk of injury. IMPORTANT: When the workpiece is long enough it should always be positioned on the table with one end against the left side of the column, as shown in Fig. 28. This prevents the workpiece from rotating with the drill bit or cutting tool, causing damage to the workpiece or personal injury to the operator. If it is not possible to support the workpiece against the column, the workpiece should always be fastened to the table using clamps or a vise. Fig. 28 13 INSTALLING AND REMOVING DRILL BITS DISCONNECT MACHINE FROM POWER SOURCE. 1. Insert smooth end of drill bit (A) Fig. 29, into chuck (B), as far as it will go, and then back the bit out 1/16", or up to the flutes for small bits. 2. Make certain that the drill bit (A) Fig. 29, is centered in the chuck (B) before tightening the chuck with the key (C). 3. Turn the chuck key (C) Fig. 29, clockwise to tighten and counterclockwise to loosen the chuck jaws. 4. Tighten all three chuck jaws to secure the drill bit sufficiently so that it does not slip while drilling. Fig. 29 A B C D 5. MAKE SURE chuck key (C) Fig. 29, is removed from chuck before starting drill press. Your chuck key (C) is equipped with a self-ejecting pin (D) which helps minimize the hazard of the key being left in the chuck. CORRECT DRILLING SPEEDS Factors which determine the best speed to use are: kind of material being worked, size of hole, type of drill or other cutter, and quality of cut desired. Use the recommended speed for the drill press bit and workpiece material. BORING IN WOOD Twist drills, although intended for metal drilling, may also be used for boring holes in wood. However, machine spur bits are generally preferred for working in wood; they cut a flat bottom hole and are designed for removal of wood chips. Do not use hand bits which have a screw tip; at drill press speeds they turn into the wood so rapidly as to lift the work off the table and whirl it. For through boring, line up the table so that the bit will enter the center hole to avoid damage to the table. Scribe a vertical line on the front of the column and a matching ma...