Delta 900585 Instruction Manual

Contents

Delta 900585 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 spurbits are generally preferred for wood working; 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 of the table to avoid damage. Scribe a verticalline on the front of the column and a matchmark on the table bracket, so that the table can be clamped in the centerposition at any height.Fig. 32Fig. 33IMPORTANT: When the workpiece is long enough itshould always be positioned on the table with one endagainst the column, as shown in Fig. 32. This preventsthe workpiece from rotating with the drill bit or cuttingtool, causing damage to the workpiece or personal injuryto the operator. If it is not possible to support theworkpiece against the column, the workpiece shouldalways be fastened to the table using clamps or a vise.Feed slowly when the bit is about to cut through thewood to prevent splintering the bottom face. Use ascrap piece of wood (A) Fig. 33, for a base block underthe work; this helps to reduce splintering and protects thepoint 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.A

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