Mini Project

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  • Topic: Numerical control, Drill, Milling machine
  • Pages : 28 (8116 words )
  • Download(s) : 33
  • Published : April 17, 2013
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CONTENTS

1| ABSTRACT| |
2| ABBREVIATION| |
3| INTRODUCTION TO NC AND CNC| 4|
4| HISTORY| 7|
5| CNC SYSTEM ELEMENTS| 10|
6| WORING ON CNC MACHINES| |
7| BASIC CONCEPTS OF PART PROGRAMMING| 16|
8| TYPES OF CNC MACHINES| 18|
9| PROPERTIES OF CNC MACHINES| 20|
10| DRILLING AND TAPPING ON CNC| 35|
11| APPLICATIONS OF CNC MACHINES| 49|
12| ADVANTAGES AND DISADVANTAGES OF CNC| 51|
13| CONCLUSION| 52|

LIST OF FIGURES PAGE NO
1| Hydrotel Milling Machine| 5|
2| Chiron CNC Machine| 5| 3| CNC Lathe Machine| 6|
4| CNC elements block diagram| 10 | 5| Point to Point tool path| 11| 6| Contour Tool Path| 12|

7| Continuous path tool movements| 18| 8| Continuous path controllers| 19| 9 | Schematic Illustrations of components(a)An open loop(b)A closed loop control| 19| 10| CNC Lathe| 21|

11| CNC Grinders| 21|
12| CNC Drilling| 22|
13| CNC Boring machine| 22|
14| Electrical Discharge Machines (EDM)| 23|
15| Laser cutting machine tools| 23|
16| Flat bed CNC Lathe| 25|
17| Slant bed CNC Lathe| 25|
18| CNC Tool Turrent| 26|
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28| Different tools in Drilling machines| 26|
20| Tool Holders| 27|
21| CNC with Fanuc control| 28|
22| CNC setter| 29|
23| Override Speed setter| 31|
24| CNC Backlash| 32|
25| Sensitive Drilling machine| 37|
26| Radial drilling machine| 38|
27| Up-right Drilling machine| 38|
28| Drill materials| 39|
29| Tool nomenclature| 40|
30| Tool holding devices| 41|
31| Various operations of drilling machines| 42|
32| Counter Boring| 43|
33| Counter sunk| 43|
34| Spot Facing| 43|
35| Hands Taps| 46|
36| Holding Devices| 48|
37| Types of Clamps and C- Clamps| 49|
38| Products used in Aerospace Industry| 49|
39| 5 Axis CNC Milling machine| 50|

3. INTRODUCTION TO NC AND CNC

Numerical control (NC) refers to the automation of machine tools that are operated by programmed commands encoded on a storage medium, controlled manually via hand wheels or levers, or mechanically automated via cams alone. The first NC machines were built in the 1940s and 1950s.These early servomechanisms were rapidly augmented with analog and digital computers, creating the modern computer numerical control (CNC) machine tools that have revolutionized the machining processes. The program is translated into the appropriate electrical signals for input to motors that run the machine.

A CNC machine is an numerical control machine with the added feature of an on board computer. The computer is referred to as the machine control unit (MCU).In modern CNC systems, component design is highly automated using computer-aided design (CAD) and computer-aided manufacturing (CAM) programs.

The programs produce a computer file that extracts the commands needed to operate a particular machine, and then loaded into the CNC machines for production. Since any component might require the use of a number of different tools-drills, saws, etc., modern machines often combine multiple tools into a single "cell".

The Evolution of NC
It was in 1947 when numerical control was born. It began when John C. Parsons of the Parsons Corporation, Traverse City, Michigan, a manufacturer of helicopter rotor blades, could not make his templates fast enough. So, he invented a way of coupling computer equipment with a jig borer. Mr. Parsons used punched cards to operate his digit Ron system. 1949 was the year of another “Urgent need”. The U.S. Air...
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