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




Motivation and uses


To manufacture complex curved geometries in 2D or 3D was extremely expensive by mechanical means (which usually would require complex jigs to control the cutter motions)


Machining components with repeatable accuracy


Advantages of CNC

Easier to program;
- Easy storage of existing programs;
- Easy to change a program
- Avoids human errors
- NC machines are s ....etc

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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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I want Bhel Haridwar summer training report ppt on cnc machines. ....etc

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PRESENTED BY
SUBHENDU KUMAR BEHERA


INTRODUCTION –
BHEL was established more than 50 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 and achieved a turnover of Rs 2,658 crore for the year 2007-08, showing a growth of 17 per cent over the previous year. Bharat Heavy Electricals Limited is ....etc

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please, give me ppt of cnc contructional feature in 12 slide of power point presantation.
....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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