Delta 18-900L Use and Care Manual Page 20

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20
Fig. 46
U1
the spindle adapter and chuck fall from the quill.
CORRECT DRILLING SPEEDS
Factors that determine the correct speed are 1) the
workpiece,2)thesizeofthe hole,3)thetypeof bitor
othercutter,and4)thequalityofcut.
Use the recommended speed for the the
drill press bit and workpiece.
DRILLING WOOD
To reduce the risk of injury, tighten all lock
handles before starting the machine. Loss of control of
the workpiece can cause serious injury.
Twist drills, usually intended for metal drilling, can also be
used for boring holes in wood. However, machine spur
bits are generally preferred for working in wood. These
bitscutaat-bottomholeandaredesignedforremovalof
woodchips.Donotusehandbits(screwtip).Atdrillpress
speeds, they lift and rotate the workpiece.
Forthroughboring,aligntheworkpiecesothatthebitwill
go through the center hole in the table. Scribe a vertical
line on the front of the column and a matching mark on
the table bracket and the drill press head, so that the
table and drill press head can be clamped in the center
position at any height.
Feedthedrillbitslowlyintotheworkpiecewhenthebit
is close to cutting through the wood to prevent splintering
thebottomface.Useascrappieceofwoodasabase
block under the work to reduce splintering and protect
the point of the bit.
DRILLING METAL
To reduce the risk of injury, tighten all lock
handles before starting the machine. Loss of control of
the workpiece can cause serious injury.
Use clamps to hold metal workpieces. Never hold the
workpiece in your bare hand. The drill bit can seize the
work at any time, especially when breaking through the
workpiece and cause damage to the machine or injury
to you. The drill bit will break if the workpiece strikes the
column.
S1
T1
L1
X1
W1
Fig. 47
Fig. 48
Clamptheworkpiecermly.Anytilting,twisting,orshiftingresultsnotonlyinaroughhole,butalsoinbitbreakage.Forat
work, lay the workpiece on a wooden base and clamp it rmly against the table to prevent it from turning. If the workpiece
isofirregularshapeandcannotlayatonthetable,securelyblockorclampit.
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