Delta 17-900 Instruction Manual

Contents

Delta 17-900 Instruction Manual Manual pdf 14 page image

14BORING IN WOODTwist 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 square bottom hole and aredesigned for removal of woodchips. Do not use hand bits which have a screw tip; at drill press speedsthey 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. Scribea vertical line on the front of the column and a matchmark on the table bracket, so that the table canbe clamped in the center position at any height.Feed slowly when the bit is about to cut through the wood to prevent splintering the bottom face. Usea scrap piece of wood for a base block under the work. This helps to reduce splintering and protectsthe point of the bit.DRILLING METALUse clamps to hold the work when drilling in metal. The work should never be held in the bare hand;the lips of the drill may seize the work at any time, especially when breaking through the stock. If theworkpiece is whirled out of the operator’s hand, he may be injured. The drill will be broken when thework strikes the column.The work must be clamped firmly while drilling; any tilting, twisting or shifting results not only in a roughhole, but also increases drill breakage. For flat work, lay the piece on a wooden base and clamp itfirmly down against the table to prevent it from turning. If the piece is of irregular shape and cannot belaid flat on the table, it should be securely blocked and clamped.INSTALLING AND REMOVING DRILL BITS1. Insert smooth end of drill bit (A) Fig. 31, as far as itwill go into the chuck (B), and then back the bit out1/16”, or up to the flutes for small bits.2. Make certain that the drill bit (A) Fig. 31, is centeredin the chuck (B) before tightening the chuck with the key(C).3. Turn the chuck key (C) Fig. 31, clockwise to tightenand counterclockwise to loosen the chuck jaws.4. Tighten all three chuck jaws to secure the drill bitsufficiently so that it does not slip while drilling.5. MAKE SURE chuck key (C) Fig. 31, is removed fromchuck before starting drill press. Your chuck key (C) isequipped with a self-ejecting pin (D) which eliminatesthe hazard of the key being left in the chuck.CDBAFig. 31

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