Archive for November 2012

Computer Numerical Control | CNC | What Is CNC | How CNC Works |

November 23, 2012

The term numerical control is a widely accepted and commonly used term in the machine tool industry. Numerical control (NC) enables an operator to communicate with machine tools through a series of numbers and symbols.

NC which quickly became Computer Numerical Control (CNC) has brought tremendous changes to the metalworking industry. New machine tools in CNC have enabled industry to consistently produce parts to accuracies undreamed of only a few years ago. The same part can be reproduced to the same degree of accuracy any number of times if the CNC program has been properly prepared and the computer properly programmed. The operating commands which control the machine tool are executed automatically with amazing speed, accuracy, efficiency, and repeatability.

The ever-increasing use of CNC in industry has created a need for personnel who are knowledgeable about and capable of preparing the programs which guide the machine tools to produce parts to the required shape and accuracy. With this in mind, the authors have prepared this textbook to take the mystery out of CNC – to put it into a logical sequence and express it in simple language that everyone can understand.

01-CNC lathe - CNC Turning Center-Cartesian Coordinate System


01-cost-effective-2-axis-cnc-lathes-computer numeric control

Milling Machine
The milling machine has always been one of the most versatile machine tools used in industry (Fig. 5). Operations such as milling, contouring, gear cutting, drilling, boring, and reaming are only a few of the many operations which can be performed on a milling machine. The milling machine can be programmed on three axes:
• The X axis controls the table movement left or right.
• The Y axis controls the table movement toward or away from the column.
• The Z axis controls the vertical (up or down) movement of the knee or spindle.

01-3 axis - vertical Machining center-CNC Machining Center

The main axes of a vertical machining center.

01-Cnc-Milling-Machines-milling, contouring, gear cutting, drilling, boring, and reaming

What is a CNC Machine?
A CNC machine is basically a computer controlled high precision tool that is able to make intricate movements accurately and repeatedly. Our machines use common routers and spindles to mill, cut, engrave and shape materials in automated machining operations.

How do CNC Machines work?
A CNC machine takes codes from a computer and converts the code using software into electrical signals. The signals from the computer are then used to control motors. Since the motors can turn very small amounts the machine is able to move in highly precise movements over and over again.

What can CNC Machines do?
There is virtually no limit to what a CNC can do. CNC machines are responsible for almost all modern day machining operations in manufacturing industries. They normally costs tens of thousands of dollars, or hundreds of thousands of dollars. Our machines can be used to engrave plaques, cut wood for kits, mill aluminum parts, and inject plastic components. All it requires is willing to learn and understand how to use the machines to accomplish what you want to do.

CNC Viva Questions

November 23, 2012

7th Sem Mechanical Engineering Exam Time Table

November 22, 2012


Models 1

November 19, 2012


Bench Grinder

Centrifugal pump impeller

Planetary Gear

Machine vice