19
Metal Drilling
For maximum performance, use high-speed steel bits for metal or steel drilling.
•
When drilling metals, use light oil on the drill bit to keep it from overheating. The oil will
prolong the life of the bit and increase the drilling action.
•
Begin drilling at a very low speed to prevent the bit from slipping off the starting point.
•
Maintain a speed and a pressure that allow cutting without overheating the bit. Applying too
much pressure will:
–
Overheat the Drill.
–
Wear the bearings.
–
Bend or burn bits.
–
Produce off-center or irregularly shaped holes.
Masonry Drilling
For maximum performance, use carbide-tipped masonry bits when drilling holes in brick, tile,
concrete, etc.
•
Maintain a speed and a pressure that allow cutting without overheating the bit or drill.
Applying too much pressure will:
–
Overheat the drill.
–
Wear the bearings.
–
Bend or burn bits.
–
Produce off-center or irregular-shaped holes.
•
Apply light pressure and medium speed for best results in brick.
•
Apply additional pressure for hard materials such as concrete.
•
When drilling holes in tile, practice on a scrap piece to determine the best speed and
pressure.
•
Begin drilling at a very low speed to prevent the bit from slipping off the starting point.
NOTICE:
Fig.12 shows some tips for different drilling operations.
Fig. 12
Dust-free drilling in walls
Dust-free drilling in ceilings
Drilling in tiles without
skidding