Delta DP350 Instruction Manual

Also see for ShopMaster DP350: Instruction manual Instruction manual

Contents

Delta DP350 Instruction Manual Manual pdf 15 page image

15CORRECT DRILLING SPEEDSFactors which determine the best speed to use are: kind of material being worked, size of hole, type of drill or othercutter, and quality of cut desired.Use the recommended speed for the drill press bit and workpiece material.BORING 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 to the table. Scribe avertical line on the front of the column and a matching mark on the table bracket and the drill press head, so that thetable and drill press head can be 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. Use a scrap pieceof wood as 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 metal. The work should never be held in the bare hand; the drill bit may seizethe work at any time, especially when breaking through the stock. If the piece is whirled out of the operator's hand, theoperator may be injured. The drill bit will be broken if 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 bit breakage. For flat work, lay the piece on a wooden base and clamp it firmly down against the tableto prevent it from turning. If the piece is of irregular shape and cannot be laid flat on the table, it should be securelyblocked and clamped.TROUBLESHOOTINGFor assistance with your machine, visit our website at www.deltamachinery.com for a list of service centers or callthe DELTA Machinery help line at 1-800-223-7278 (In Canada call 1-800-463-3582).