Delta 11-990C Instruction Manual

Contents

Delta 11-990C 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 bitsare 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 workoff the table and whirl it.For through boring, line up the table so that the bit will enter the center hole to avoid damage. Scribe a vertical line onthe front of the column and a matchmark on the table bracket, so that the table can be clamped in the center positionat any height.Feed slowly when the bit is about to cut through the wood to prevent splintering the bottom face. Use a scrap pieceof wood for a base block under the work; this helps to reduce splintering and protects the 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 drillmay seize the work at any time, especially when breaking through the stock. If the piece is whirled out of the operator'shand, he may be injured. The drill will be broken when the work strikes the column.The work must be clamped firmly while drilling; any tilting, twisting or shifting results not only in a rough hole, but alsoincreases drill breakage. For flat work, lay the piece on a wooden base and clamp it firmly down against the table toprevent it from turning. If the piece is of irregular shape and cannot be laid flat on the table, it should be securelyblocked and clamped.ACCESSORIESA complete line of accessories is available from your Delta Supplier, Porter-Cable • Delta Factory Service Centers, andDelta Authorized Service Stations. Please visit our Web Site www.deltamachinery.com for a catalog or for thename of your nearest supplier.WARNING: Since accessories, other than those offered by Delta, have not been tested withthis product, use of such accessories could be hazardous. For safest operation, only Deltarecommended accessories should be used with this product.

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