Cnc and Dnc
Difference between CNC & NC machines
NC machines
In a Numerical Control machine, the program is fed to the machine through magnetic tapes or other such media. The original NC machines were essentially basic machine tools which were modified to have motors for movement along the axes.
CNC machines
In a Computer Numerical Controlled machine, the machines are interfaced with computers. This makes them more versatile in the sense that, suppose a change in dimension of a part is required. In a NC machine, you would have had to change the program in the tape and then feed it to the machine again. But in a CNC machine, you just change a variable in the computer and your modification is done!!
Read more: http://wiki.answers.com/Q/Difference_NC_and_CNC#ixzz27yxVbWo3
The input device is any machine that feeds data into a computer. The input devices are:
i)- Keyboard:- Keyboard is an input device consisting of a set of typewriter keys that enable us to enter data into a computer. Computer keyboard are similar to electric typewriter. Keyboard has the following keys.
Alphabetic keys (A to Z, a to z) Alphanumeric keys (0 to 9).
Special keys. Functions keys, control keys, arrow keys caps lock key, and so on.
ii). Mouse:- Mouse is a device that controls the movement of the curser or pointer on a display screen. A mouse is a small object we can roll along a hard flat surface. As we move the mouse the pointer on the display screen moves in the same direction.
iii). Joystick:- A lever that moves in all directions and controls the movement of a pointer or some other display symbols. A joystick is similar to a mouse except that with a mouse the cursor stops moving as soon as we stop moving the mouse. With a joystick the pointer continuous moving in the direction the joystick is pointing. Joysticks are used mostly for computer games but that are also used occasionally for CAD/CAM systems and other applications.
iv). Scanners:- Scanner is an input device that can read
NC machines
In a Numerical Control machine, the program is fed to the machine through magnetic tapes or other such media. The original NC machines were essentially basic machine tools which were modified to have motors for movement along the axes.
CNC machines
In a Computer Numerical Controlled machine, the machines are interfaced with computers. This makes them more versatile in the sense that, suppose a change in dimension of a part is required. In a NC machine, you would have had to change the program in the tape and then feed it to the machine again. But in a CNC machine, you just change a variable in the computer and your modification is done!!
Read more: http://wiki.answers.com/Q/Difference_NC_and_CNC#ixzz27yxVbWo3
The input device is any machine that feeds data into a computer. The input devices are:
i)- Keyboard:- Keyboard is an input device consisting of a set of typewriter keys that enable us to enter data into a computer. Computer keyboard are similar to electric typewriter. Keyboard has the following keys.
Alphabetic keys (A to Z, a to z) Alphanumeric keys (0 to 9).
Special keys. Functions keys, control keys, arrow keys caps lock key, and so on.
ii). Mouse:- Mouse is a device that controls the movement of the curser or pointer on a display screen. A mouse is a small object we can roll along a hard flat surface. As we move the mouse the pointer on the display screen moves in the same direction.
iii). Joystick:- A lever that moves in all directions and controls the movement of a pointer or some other display symbols. A joystick is similar to a mouse except that with a mouse the cursor stops moving as soon as we stop moving the mouse. With a joystick the pointer continuous moving in the direction the joystick is pointing. Joysticks are used mostly for computer games but that are also used occasionally for CAD/CAM systems and other applications.
iv). Scanners:- Scanner is an input device that can read