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Title: STUDY ON PRINCIPLE AND OPERATIONS OF CNC MACHINES IN VARIOUS FABRICATION PROCESSES
Page Link: STUDY ON PRINCIPLE AND OPERATIONS OF CNC MACHINES IN VARIOUS FABRICATION PROCESSES -
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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 c ....etc

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Title: iv and piv drives pdf
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Title: difference between nc cnc and dnc machines pdf
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Numerical control has caused a virtual revolution in the discrete metal parts manufacturing industry. The success of NC has led to number of extensions of Numeric Control concepts and technology. Four of the important developments are the following:

Direct numerical control (DNC).
Computer numerical control (CNC).
Adaptive Control.
Industrial robots.
Direct Numerical Control(DNC)
There are number of problems inherent in conventional machiningwhich are motivated machine tool builders to seek imprivements in the basic NC system. Among the diffi ....etc

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Title: difference between chopper fed drives and converter fed drives pdf
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difference between chopper fed drives and converter fed drives pdf

If the source of supply is d.c. (for example in a battery vehicle or a rapid transit system) a chopper-type converter is usually employed. The basic operation of a single-switch chopper was discussed in topic 2, where it was shown that the average output voltage could be varied by periodically switching the battery voltage on and of for varying intervals. The principal difference between the thyristor-controlled rectifier and the chopper is that in the former the motor current ....etc

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Title: NC and CNC machines and Control Programming
Page Link: NC and CNC machines and Control Programming -
Posted By: prashant_007
Created at: Thursday 17th of August 2017 08:11:00 AM
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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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Title: CHAIN DRIVES IN LOW TORQUE DRIVES AND REDUCING PULSATIONS
Page Link: CHAIN DRIVES IN LOW TORQUE DRIVES AND REDUCING PULSATIONS -
Posted By: bitatr
Created at: Thursday 17th of August 2017 06:32:31 AM
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CHAIN DRIVES IN LOW TORQUE DRIVES AND REDUCING PULSATIONS
INTRODUCTION TO DRIVES

Mechanical components used for power transmission. It may be belt, chain or gear depending on engine design parameters like - Distance between crankshaft and camshaft, engine maximum speed, engine-torque and engine construction cost. - Power transmission is done from one shaft to another shaft which may or may not rotate at same speed.

CHAIN DRIVES ....etc

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Title: NC and CNC machines and Control Programming ppt
Page Link: NC and CNC machines and Control Programming ppt -
Posted By: aslesha
Created at: Thursday 05th of October 2017 04:38:46 AM
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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 safer to operate
- Complex geometry is ....etc

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Title: what is dnc machine
Page Link: what is dnc machine -
Posted By: angitha s
Created at: Thursday 17th of August 2017 08:14:58 AM
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