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Portable drilling machines are those which can be used very easily and can drill holes anywhere in the workshop. This type of drilling machine is used for drilling holes on the objects which cannot be moved. Portable drilling machines are operated either by hand power or by engaging a separate motor. All the parts of this drilling machine are small and compact. The motor used here is of universal type that means it can be given either D.C power or A.C. The depth of holes which can be obtained by a portable drilling machine are of range 12mm to 18mm. The width of hole which is obtained through the portable driller is very small in size. High speeds are employed and small drill bits are used. In some cases these drilling machines may also work on pneumatic power.
These drilling machines are used in general for drilling small holes at high speeds on light jobs. The base of machine is either mounted on a bench (or) on a floor. Various parts of sensitive drilling machine are
a. Vertical column
b. Horizontal table
c. Motor supporting head
d. Drilling mechanism
e. Vertical spindle
In a sensitive drilling machine all the feed should be given through hand as there is no special provision for automatic feed. The holes are drilled by hand only. This has many advantages. Hand feed helps the operator to feel (or) sense the progress of drill if there arises any jam (or) block the drill can be easily released thus preventing drill from wreck (or) breakage. Sensitive drilling machine can be used for drilling small holes using high speeds by hand feed.
Upright drilling machine looks similar in construction when compared with sensitive drilling machine. This machine also has a vertical column mounted over a base. But the construction is more robust. It contains a power feed mechanism and also have a excellent table for work loading. Much number of spindle speeds and feeds are possible through upright drilling machine. This machine is most suitable for machining medium size jobs. Upright drilling machines are basically of two types.
a. Round column section
b. Pillar drilling machine
Radial drilling machine can be used to drill pieces of medium to large size. Radial drilling machine has a larger circular base over which a heavy round column is mounted. A radial arm which is allowed to move freely over the length of column is placed. Drill head mechanism is mounted over this arm. This drill head mechanism is free to move throughout the length of the arm. Not only these two but the radial arm can swing 3600. So due to these three features radial drilling machine can drill large jobs also. If the job is small it can be mounted over the table and if the job is large it can be drilled by keeping it on the floor. There are three types of radial drilling machines
a. Plain drilling machine
b. Semi universal drilling machine
c. Universal drilling machine
In this machine provisions are made for:
a. Horizontal movement of drill head
b. Vertical adjustment arm
c. Horizontal movement of drill head along the arm
d. Circular movement of horizontal arm about vertical column.