Craftsman 152.229000 Manual Del Usuario página 25

CORRECT DRiLLiNG SPEEDS
Factors that determine the correct speed are: the work-
piece, the size of the hoUe,the type of bit or other cutter,
and the quality of cut wanted,
Use the recommended speed for the ddH bit and work-
piece.
DRiLLiNG WOOD
Twist drill bits, usually intended for metaUdrHHng, can
aUso be used for boring hoUes in wood. However, brad
point or Forstner bits are generally preferred for working
in wood. These bits cut a fiat bottom hoUeand are
designed for removaU of wood chips. Do not use hand
bits which have a screw tip or auger bits. At drill press
speeds, they will Hft and rotate the workpiece.
For through boring, align the table so that the bit will go
through the center hole. 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 bit slowly when it is close to cutting through
the wood to prevent splintering the bottom face. Use a
scrap piece of wood as backup under the workpiece.
This helps to reduce splintering and protects the point
of the bit.
DRULUNG METAL,
ALUMINUM OR BRASS
NEVER hold the workpiece in your bare hands.
ALWAYS use clamps or vises to hold your workpiece.
Twist drill bits should only be used in drilling metals.
Never hold the workpiece in your bare hands; always
use clamps or vises. The drill bit may seize the work at
any time, especially when breaking through the work-
piece. If the workpiece is whirled out of the operator's
hand, the operator may be injured. The drill bit will be
broken if the workpiece strikes the column.
The workpiece must be clamped or securely held in a
vise while drilling. Any tilting, twisting, or shifting results
not only in a rough hole, but also increases drill bit
breakage. For flat work, lay the workpiece on a wooden
base and clamp it firmly down against the table to pre-
vent it from turning. If the workpiece is of irregular
shape and cannot be laid flat on the table, it should be
securely blocked and clamped.
When drilling metal, it will be necessary to lubricate the
tip of the drill bit with oil to prevent it from overheating.
DRILUNG OPERATION
Use a center punch to dent the workpiece where you
want the hole. This will keep the bit from walking when
you start the drill operation. Before turning the drill
press ON, turn the laser ON and align the cross-hairs
with center mark on the workpiece. Make sure the
workpiece is properly supported or secured to the table.
For thru-drilling, make sure the table center hole is
aligned with the drill bit. Turn the drill press ON and
start to feed the drill chuck down with the feed handles.
FEEDING TOO RAPIDLY may cause the belt or drill bit
to slip or break, the motor to stall, the workpiece to pull
loose from the table, Never try to rush your work; allow
the drill press to work smoothly,
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