Craftsman 315.115510 - Manual (Page 15)

OPERATIO
LEVEL
WOOD DRILLING
For maximum performance, use high speed steei bits for
wood driiiing,
■ Select normal drilling mode.
■ Begin drilling at a very low speed to prevent the bit
from slipping off the starting point. Increase the speed
as the drill bit bites into the material.
■ When drilling through holes, place a block of wood
behind the workpiece to prevent ragged or splintered
edges on the back side of the hole.
METAL DRILLING
For maximum performance, use high speed steel bits for
metal or steel drilling,
■ Select normal drilling mode.
■ Begin drilling at a very low speed to prevent the bit
from slipping off the starting point,
■ Maintain a speed and pressure which allows cutting
without overheating the bit. Applying too much
pressure will:
• Overheat the drill;
• Wear the bearings;
• Bend or burn bits; and
• Produce off-center or irregular-shaped holes.
■ When drilling large holes in metal, start with a small bit,
then finish with a larger bit. Also, lubricate the bit with
oil to improve drilling action and increase bit life.
Fig. 12
15