The document is a vocational training presentation on Bharat Heavy Electricals Limited (BHEL), detailing its history, operations, and various types of drilling machines. BHEL, established over 40 years ago, is the largest engineering and manufacturing enterprise in India's energy sector and has maintained a profitable track record since 1971-72. The presentation also covers safety precautions, advantages and disadvantages of drilling processes, and includes references to relevant academic texts and websites.

1. A VOCATIONAL TRAININGA VOCATIONAL TRAINING
PRESENTATIONPRESENTATION
ONON
BHARAT HEAVY ELECTRICALS LIMITED,BHARAT HEAVY ELECTRICALS LIMITED,
VARANASIVARANASI
BHELBHEL
SUBMITTED BY- BHANU PRAKASH
BRANCH- MECHANICAL ENGINEERING ((FINAL YEAR))


2.  Overview of BHEL
 Historical Background
 Drilling Machine
 Introduction
 Types of Drilling Machine
 Working
 Operations
 Safety Precautions
 Application
 Advantages & Disadvantages
 References

3.  BHEL is the largest
engineering and
manufacturing enterprise
in India in the energy
related infrastructure
sector today. BHEL was
established more than 40
years ago when its first
plant was setup in Bhopal
ushering in the indigenous
Heavy Electrical Equipment
Industry in India a dream
which has been more than
realized with a well
recognized track record of
performance it has been
earning profits
continuously since 1971-
72

4.
 Foundation Day : 26.09.1984
 Production Commencement : 01.04.1986
 Area : 29.80 Acres
 Break-Even Year : 1987-88
 Manpower : Executives – 42
: Others - 48
:

6.  Drilling is a metal cutting process carried out by
a rotating cutting tool to make circular holes in
solid materials.
 Tool which makes hole is called as drill bit or
twist drill.

7.  Portable Drilling Machine
 Bench Drilling Machine
 Radial Drilling Machine
 Pillar Drilling Machine
 Gang Drilling Machine
 Multiple Drilling Machine

8.  These are light duty
machines used in small
workshops.
 Also called Sensitive
drilling machines
because of its accurate
and well balanced
spindle.
 Holes of diameter 1 mm
to 15 mm.

9.  Work piece with the exact location marked on it
with the centre punch is clamped rigidly on the
work table.
 spindle axis and center punch indentation are
in same line.
 Machine is started and drill bit is lowered by
rotating feed handle.
 Drill bit touches the work and starts removing
material

10.  These are heavy duty
and versatile drilling
machine used to
perform drilling operate
on large and heavy work
piece.
 Holes up to 7.5 cm.

11.  Work piece is marked for exact location and
mounted on the work table.
 Drill bit is then located by moving the radial
arm and drill to the marked location.
 By starting drill spindle motor holes are drilled.

12.  Reaming
 Boring
 Counter boring
 Counter sinking
 Spot facing
 Tapping

13.  It is a process of
smoothing the surface
of drilled holes with a
tool.
 Tool is called as reamer.
 Initially a hole is drilled
slightly smaller in size.
 Drill is replaced by
reamer.
 Speed is reduced to half
that of the drilling.

14.  It is process carried on a
drilling machine to
increase the size of an
already drilled hole.
 Initially a hole is drilled
to the nearest size and
using a boring tool the
size of the hole is
increased.

15.  This process involves
increasing the size of a
hole at only one end.
 Cutting tool will have a
small cylindrical portion
called pilot.
 Cutting speed = two-
thirds of the drilling
speed for the same
hole.

16.  This is an operation of
making the end of a
hole into a conical
shape.
 Cutting speed = half of
the cutting speed of
drilling for same hole.

17.  This is an operation of
making the end of a
hole into a conical
shape.
 Cutting speed = half of
the cutting speed of
drilling for same hole.

18.  It is a finishing
operation to produce
flat round surface
usually around a drilled
hole, for proper seating
of bolt head or nut.
 It is done using a
special spot facing tool.

19.  Process of cutting
internal threads with a
thread tool called as
tap.
 Tap is a fluted threaded
tool used for cutting
internal thread
 Cutting speed is very
slow.

20.  Do not support the work piece by Hand – Use
work holding device.
 Use brush to clean the chip
 No adjustments while the machine is operating
 Ensure for the cutting tools running straight
before starting the operation.
 Protect the eyes.

21. ADVANTAGES
DISADVANTAG
ES High precision and accuracy
 Require less labour
 Accurate dimension can be
obtain just by knowing the
co-ordinates
 The co-ordinate measuring
machine are very costly
 If the operation software
cracks down it is difficult to
restart the entire system
 Its need to construct some
motor for its own parts for
operating

22. Books -
 Manufacturing Process by Bhupendra Gupta,
Mukesh Pandey, Anil Kumar.
 Manufacturing Science by Ashok Kumar Mallik.
 Manufacturing Technology by P N Rao.
Websites -
 https://en.m.wikipedia.org>wiki>drilling
 https://slideshare.net>mobile>drilling