its brief description about boring machinee

1. Lendi Institute of Engg &Technology
Boring machine
By
Polaiah(asst prof)

2. Introduction
 When internal surface
of a hollow part is
turned, a single point
cutting tool is used for
enlarging a hole, the
operation is called
BORING
 The bar on which
single point tool is
mounted is called
BORING BAR

3. Types of Boring Machines
 Horizontal Boring Machine ( HBM )
1. Table type HBM
2. Planer type HBM
3. Floor Type HBM
4. Multiple Spindle HBM
 Vertical Boring Machine ( VBM )
1. Single Column VBM
2. Double Column VBM

4. Types
Horizontal boring machine:
 The work is supported on a table which is stationary and tool revolves in a
horizontal axis.
 Can perform boring, reaming, turning, threading, facing, milling , grooving
and many other operations with suitable tools.
 Work piece which are heavier and asymmetrical can be easily held and
machined.
 Different types has been designed to suit the different purpose.

5. Horizontal boring machine

6. Horizontal boring machine

7. Horizontal Line Boring Machine

8. Vertical Boring Machine:
 The work rotates on a horizontal table about a vertical axis and the tool
is stationary except for feed.
 Machine may look like a vertical lathe.
 Larger diameter and heavy work pieces, can be set up more quickly than
in lathe.
 Multiple tooling may be adapted with its turret type tool post, increasing
the rate of production.

9. Vertical boring machine

10. Vertical boring machine

11. Vertical Boring Operations

12. Vertical Boring Operations

13. JIG BORING
MACHINE

14. Jig Boring Machine
 It uses a single point cutting tools to machine surfaces rapidly and
accurately.
 Cemented carbide and diamond tipped tools are operated at a very high
cutting speed to produce accurately sized holes with fine surface.
 Jig boring machine is a precision boring machine, resembles to vertical
milling machine in construction.
 Accurate positioning of holes is achieved by Lead screw method or
Mechanical / Electrical Gauging method or Optical measuring method.

15. Jig Boring Machine
 Jig-Boring Machine a metal-cutting machine for finishing holes, planes, and
slots with a highly precise location of centers or surfaces without the use of
special attachments for tool alignment.
 Jig-boring machines are used for boring, drilling, counter-sinking, reaming,
milling, and other types of finishing in individual and small-scale production
during the manufacture of cutting and measuring tools, jigs, dies, and key
components of machines and instruments. Devices with stable and adjustable
end gauges and indicator sensing units are used on jig-boring machines for
precise measurements; also used are lead screws with dials and a vernier, which
are equipped with error-elimination compensators, and graduated shafts with
optical measuring instruments.

16.  There are two types of these machine tools: double-sided (gantry) machines with
a one-movement table and open-sided (single-sided, overhanging) machines
with a two-movement table. In open-sided machines the spindle head moves
only vertically; in the double-sided machines it moves horizon-tally along the
crosspiece, which can travel in a vertical direction.
 The manufactured article and the cutting tool on the jig-boring machine are
moved relative to one another along orthogonal coordinates (with linear
displacement accuracy to 2 microns) and polar coordinates (with angular
displacement accuracy to 5 seconds of arc). Sturdy construction is a feature of
jig-boring machines, which have smooth drive motions and accurate balancing
of fast-rotating parts (to reduce vibration).
 The machines are installed in insulated areas in which a constant temperature of
20°C is maintained. Jig-boring machines are operated by highly skilled workers.

17. Jig Boring
Jig Boring Machine Jig Boring

18.  The boring operation can be carried out
on lathe and milling machine but the need
of accuracy of holes, its quality and
relative position of different hole centers is
demanded in jig & fixtures. To cope up
with this work boring machine are need ,
which are called “jig boring machine”.
NEED OF JIG BORING MACHINE

19.  The jig boring is a special type of boring
process, hence its working principal is just
similar to the boring process.
 In this process rotating tool is passed over the
stationary work. This principal is used for
large work pieces, while for small size work
pieces tool is kept stationary and work is
moved by applying force.
 The feed in this process is given with
respective to the vertical axis of the hole and
its radius.
 WORKING PRINCIPLE OF JIG BORING PROCESS

21.  Jig boring machine generally consists of a heavy base and a
column.
 A spindle head is provided at the top of this column, which is
fixed on the guide ways of the column. The spindle is fixed using
preloaded antifriction bearings.
 The table is arranged on the saddle. It can move in different on
the guide ways of the saddle.
 Table provides longitudinal motion to the work piece & saddle
cross movement to the work piece.
 By moving the spindle head up and down, the vertical movement
of the spindle is obtained.
CONSTRUCTION &MAIN FEATURES

22.  BED:-the component which base
to the machine is called bed it us
made from C.I. it support the
column, saddle, control penal and
whole machine.
 COLUMN:-it is also a hollow
component made from cast iron. It
is supporting the head stock ,
guide ways and vertical head
provides axis for positioning.
 head-stock:-it is also called
spindle-head.it is fixed on column
in front side. Spindle is supported
in quill. As this quill is moving up
and down side becomes like a
telescopic mechanism.
 MAIN COMPONENT OF JIG BORING MACHINE

23.  TABLE AND SADLE:- table
helps to clamp and hole the
work piece in a fixture in
required position. Hence t-
shaped slots are made in it.
The saddle provides
possibility of longitudinal
motion of the work piece.
 PICK-UP DEVICES:- it is
attached on the table and
saddle. It is helping in
controlling various machine
operations automatically.
Again devices are necessary
for accurate measurements.

24. THERE ARE MAINLY TWO TYPES OF JIG
BORING M/C.
 Single column jig boring machine
 Double column jig boring machine
 TYPES OF JIG BORING MACHINE

25.  Single column jig
boring machine is
used for small size of
component.
 It is made of plain
rotary table, inclined
table and square table
 It looks like a vertical
milling machine, hence
it is called vertical
milling type jig boring
machine.
SINGLE COLUMN JIG BORING MACHINE

26.  The vertical columns
are provided at two
sides of this machine.
 This construction looks
like a planer hence it is
called a planer type jig
boring machine.
 It is used for the large
weight work pieces.
 DOUBLE COLUMN JIG BORING MACHINE

28.  The jig boring machine is specified by following basis;
 Distance of spindle axis from column.
 Maximum distance between spindle face & table.
 Minimum distance between spindle face & table.
 Diameter and taper of spindle hole
 Maximum diameter that can be bored.
 Maximum weight of work which can be placed.
 Dimension of working axis of table
 Maximum table transverse.
 Horse power of main motor.
 Horse power of table feed motor.
 Minimum measuring capacity of dial.
 Least count of venire caliper.
 Various spindle speeds.
 SPECIFICATION OF JIG BORING MACHINE

29.  The more accuracy is required in measurement taken by jig boring
machine and in position, generally different measuring mechanisms
are used for taking measurements. They are as under.
1. Precision lead screw system
2. Scale and microscope system
3. End measurement system
4. Electro – magnetic system
SYSTEM OF
MEASUREMENT

30.  TOOLS
 Based on its construction
1. Forged type boring tool.
2. Carbide tip tool.
 Based on shape
1. Common type boring tool
2. Haviour cut boring tool
3. Special boring tool
 BORING TOOL MOUNTINGS
1. Boring bar
2. Cutter heads
3. Facing heads
 BORING TOOLS AND MOUNTINGS

31.  For jigs, fixtures and dies.
 For drilling hole in jig-bushing.
 To produce compound and progressive
dies.
 For pilot hole & bushing hole for grinding &
alignment post in stripper or die-set.
 For grinding the hardened parts.
 APPLICATION OF JIG BORING MACHINE

32. Thank u
Yours
polaiah