JIG BORING MACHINE TOOL

PREPARED BY:- Chaturvedi anupam.a.

ENROLLMENT NO.:- 116390319033GUIDED BY:- miss. Krishna patel

Need of jig boring machineWorking principal of jig boring process Constructional features Main components of jig boring M/CTypes of jig boring machine Specification of jig boring M/C System of measurementBoring tools and mountingsApplications

IMPORTANT TOPICS IN PRESENTATION

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

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

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

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

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.

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

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

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

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 holeMaximum diameter that can be bored.Maximum weight of work which can be placed.Dimension of working axis of tableMaximum 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

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 system2. Scale and microscope

system3. End measurement system4. Electro – magnetic system

SYSTEM OF MEASUREMENT

TOOLS

Based on its construction1. Forged type boring tool.2. Carbide tip tool. Based on shape1. Common type boring tool2. Haviour cut boring tool3. Special boring tool

BORING TOOL MOUNTINGS

1. Boring bar2. Cutter heads3. Facing heads

BORING TOOLS AND MOUNTINGS

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