The recent increase in the use of hard, high strength and temperature resistant materials in engineering necessitated the development of newer machining techniques. Conventional machining or finishing methods are not readily applicable to the new materials like hastalloy, nitralloy, waspalloy, nimonics, carbides, ceramics etc.


Conventional machining processes when applied to these newer materials:
1. Are uneconomical,
2. Produce poor degree of surface finish and accuracy,
3. Produce some stress,
4. Highly insufficient.

Newer machin ....etc

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Elements of Jigs and Fixtures



1: Body:
The jig body is generally made of cost iron by casting process or fabricated by welding together various slabs and bars of mild steel. It may be heat treated to relief the stresses. Body is the most prominent feature of the jig. Its main purpose is to support and house the job.

The various jig body are follows:


(A):Plane Type Jig:
Plane type jig is the simplest type, it is used when plane ....etc

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SYNOPSIS
Wire Electric Discharge Machining(WEDM) is one of the most important non-traditional machining process.Taguchi method is supplemented with various supportive techniques such as fuzzy logic, grey-relational analysis,two-phase parameter design, artificial neural network(ANN) and various combination methods to incorporate material removal rate(MRR) and surface roughness(SR)simultaneously .Particle Swarm Optimization(PSO)& Memetic Algorithm(MA) based optimization procedures have been developed to o ....etc

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A SEMINAR ON
ADAPTIVE CONTROL MACHINING
ABSTRACT

Adaptive control system is a logical extension of the CNC-mechanism. In CNC mechanism the cutting speed and feed rates are prescribed by the part programmer. The determination of these operating parameters depends on the Knowledge and experience regarding the work piece, tool materials, coolant conditions and other factors.
By contrast in adaptive control machining, there is improvement in the production rate and reduction in t ....etc

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Author: niranjan


Abstract
Hot machining is the process which is used for easy machining and to eliminate the problems of low cutting speeds, feeds and heavy loads on the machine bearings. This problem arises when machining process is being done on the new and tough materials. The basic principle behind this process is the surface of the work piece which is to be machined is to be pre heated to a temperature below the re-crystallization temperature. By this heating the shear forces gets reduces and mach ....etc

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HIGH SPEED MACHINING
ABSTRACT
Over the past 60 years, high speed machining (HSM) has been applied to a wide range of metallic and non-metallic work piece materials including the production of components with specific topography requirements and machining of materials with hardness of 50 HRC and above.
With most steel components hardened to approximately 32-42 HRC, machining operations currently include:
Rough machining and semi-finishing of the material
Heat treatment to ach ....etc

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PRECISION ENGINEERING & PRACTICE

1. INRODUCTION
There are three terms often used in precision practices and they are often used incorrectly or in a vague manner. The terms are accuracy, repeatability, and resolution. Because the present discussion is on machining and fabrication methods, the definitions will be in terms related to machine tools. However, these terms have applicability to metrology, instrumentation, and experimental procedures, as well.
1.1 Accuracy
....etc

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ELECTRICAL DISCHARGE MACHINING
DIAGRM OF EDM
WORKING PRINCIPLE OF EDM
 In electrical discharge machining , metal is removed by producing powerful electrical spark discharge between the tool (cathode) and the work material 9anode). It is also known as spark erosion machining or electro-erosion machining….
CONSTRUCTION AND WORKING OF EDM
 Construction:
 The main components are the electrical power supply ,dielectric medium , work piece , tool and a servo control mech ....etc

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E-CASH PAYMENT SYSTEM


INTRODUCTION
With the onset of the Information Age, our nation is becoming
increasingly dependent upon network communications. Computer-based
technology is significantly impacting our ability to access, store, and
distribute information. Among the most important uses of this
technology is electronic commerce: performing financial transactions
via electronic information exchanged over telecommunications lines. A
key requirement for electronic commerce is the development of s ....etc

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OPTIMIZATION OF SURFACE ROUGHNESS



INTRODUCTION

TURNING OPERATION
Turning is the removal of metal from the outer diameter of a rotating cylindrical work piece. Turning is used to reduce the diameter of the work piece, usually to a specified dimension, and to produce a smooth finish on the metal. Often the work piece will be turned so that adjacent sections have different diameters.
Turning is the machining operation that produces cylindri ....etc

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