Drill
A drill is a common tool used in woodworking and
metalworking, having a rotating drill bit which is used for drilling
holes. It is an implement with cutting edges or a pointed end for boring
holes in hard materials, usually by a rotating abrasion or repeated
blows. A drill can be both power operated or manually operated. The
manually operated drills are hand tools, which are portable, which are
held and operated by hand. In-fact a drill can be considered as the most
essential part of any tool collection. While the electrically powered
drill is considered to be more effective, the hand operated drill is
also very important for many repair and maintenance tasks around the
home. Drill are available in various sizes and the size of the drill is
determined by the maximum drill bit shank that the chuck of the drill
bit can accommodate.
How does a drill work?
At one end of the drill, the drill bit is gripped or hold tightly by a
chuck and is pressed against the material which requires to be grilled.
The drill bit is rotated . The drill bit's tip does the work of cutting
into the material, thereby cutting off thin shavings (auger bits or
twist drills) or grinding off small particles (oil drilling).
Type of drills
As already mentioned, there are many types of drills, some of which are
powered manually, while others using electricity as the power. We give
below a list of drills which are manually operated or used as a hand
tool.
- Hand Drill: This is the most common type of drill. It has
a hand operated crank handle which turns an interlocking gear that
rotates the drill bit. It is very useful when a small number of
holes are required. It can drill into wood, soft metal, and plastics
and other materials. Hand drills may be considered old-fashioned,
but they are still preferred by many woodworkers for woodworking and
other tasks where you want to have total control.
- Breast Drill: It is a larger version of the hand drill
with a saddle shaped plate to lean on which helps to apply pressure
while drilling. There are some models with an extra side handle for
stability. This type of drill is a portable drill and the plate is
pressed against the chest to force the drill point into the work ,
for making holes in hard materials.
- Miniature Hand Drill: This is a small sized hand drill ,
used for fine work, like model making, or boring holes with very
small, high-speed steel bits. This type of drill is particularly
suited for making pilot holes for small screws. There are some with
collets at both ends which help the user to use different size
drills available without having to change the drill bit.
- Brace: This type of drill has the drill bit which rotates
manually cranking the handle while pressure is applied. It is
particularly useful for drilling into wood. It can accept larger
drill shanks compared to a hand drill. The brace can also used for
screw driving.
- Push Drill: A push drill, similar in appearance to a
push-pull screwdriver, is operated by a push-pull movement for light
jobs. Most push drills have space in the handle for storing extra
drill points, bolts, screws, etc. This is mainly used for drilling
pilot holes. It uses straight-fluted drill bits that are rotated via
a repetitive pushing motion and this motion can be achieved
single-handedly.
- Gimlet: A drill used for drilling small holes, specially
in wood, without splitting. The shape of the drill is in a
semi-cylindrical form made of steel, hollow on one side, with a
cross handle at one end and a screw at the other.
- Pin Chuck: It is a small sized work holding device. The
main purpose of pin chuck is to hold small drills (<1 mm) that
would not otherwise be held securely in a normal drill chuck. The
drill is inserted into the pin chuck and tightened, which is then
put inside the larger drill chuck so that the drilling operation
continues.
