The difference between NC and CNC is one of age andcapability.
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The earliest NC machines performed limited functionsand movements controlled by punched tape or punch.
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As the technology evolved, the machines were equiped with increasingly powerful microprocessors (computers) with the addition of these computers, NC machinesbecome CNC machines.
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CNC machines have far more capability than theirpredecessor. ....etc

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hi I have to write a different between cnc and dnc machine plz help me ....etc

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I M LOOKING FOR NC, CNC, DNC PPT PLZ SEND ....etc

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CAM Systems & CNC Machine
History
1955 - John Parsons and US Air Force define a need to develop a machine tool capable of machining complex and close tolerance aircraft parts with the same quality time after time (repeatability). MIT is the subcontractor and builds the machine for the project
1959 - MIT announces Automatic Programmed Tools (APT) programming language
1960 - Direct Numerical Control (DNC). This eliminates paper tape punch programs and allows programmers to send files directly to machine tools
19 ....etc

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Presented by
Mr. Prateek Singh
(Vocational Trainee-BHEL Bhopal)





INDEX

DEVELOPMENT OF CNC MACHINES

CNC SYSTEM

PROGRAMMABLE LOGIC CONTROLER

SERVO DRIVES

CNC RETROFITTING

MAINTENANCE MANAGEMENT

DEVELOPMENT OF CNC MACHINES
EVOLUTION OF THE CNC MACHINES

CNC MACHINES DEVELOPMENTS

BENEFITS OF CNC MACHINES


EVOLUTION OF THE CNC MACHINES

The first CNC Machine was built in 1949 at MIT ,USA for manufacturing of the Air Craft components having ....etc

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Diploma in Engineering
Mechanical Engineering
A
Seminar Report
On
CNC Machine
Submitted by
Sudhir S. Shinde
Under the Guidance of
Mr. Abhinav Phadke
To,
Mod “ Tech College of engineering
Tilak Maharashtra University
Gultekdi, Pune “ 37
Year 2009-2010
Tilak Maharashtra University, Pune
Mod “ Tech College of engineering

INTRODUCTION
In Industry it is not efficient or profitable to make everyday products by hand. On a CNC machine it is possible to make hundreds or even thousands of the same items in a day. Fi ....etc

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In an ideal scenario of intelligent machine tools the human mechanist was almost replaced by the controller. During the last decade many efforts have been made to get closer to this ideal scenario, but the way of information processing within the CNC did not change too much.The paper summarizes the requirements of an intelligent CNC evaluating the advancement of technology in this field using different adaptive control systems. In this paper a low cost concept for artificial intelligence named Knowledge Server for Controllers (KSC) is introduce ....etc

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NC, CNC, DNC Machine
Numerical Control (NC) refers to the method of controlling the manufacturing operation by means
of directly inserted coded numerical instructions into the machine tool.
Numerical control (NC) refers to the automation of machine tools that are operated by abstractly programmed commands encoded on a storage medium, as opposed to manually controlled via handwheels or levers, or mechanically automated via cams alone.
The major advantages of NC over conventional methods of machine control are as ....etc

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NC and CNC machines and Control Programming


History of CNC


1949
US Air Force asks MIT to develop a numerically controlled machine.

1952
Prototype NC machine demonstrated (punched tape input)


1980-
CNC machines (computer used to page link directly to controller)


1990-
DNC: external computer “drip feeds” control programmer to machine tool controller
....etc

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