Types of cnc machines pdf

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The machines controlled by CNC can be classified into the following categories: CNC mills and machining centers, CNC lathes and turning centers CNC electrical discharge machining (EDM) CNC grinding machines CNC cutting machines (laser, plasma, electron, or flame) CNC fabrication machines (sheet metal punch press, Item Conventional machine CNC machine 1. Movement Acme screw Ball screw 2. Feed Manual Motor 3. Measurement Manual Linear scale Advantages of CNC •Flexible, high accuracy •Short production time •Complex shapes •Short setting time •No skill requirement •Short inspection time/ high quality product •Low cost Disadvantages of CNC Types of CNC Machines CNC Grinders Grinding metal process uses a coated wheel that slowly removes metal to create a part. Through the years, grinding was done on a manual machine, but with the advent of CNC technology, the grinding process has advanced Figure 8 :cnc-machine-center.blogspot.com/2008/09/cnc-surface-grinding-machine.html NC Machine CNC Machine; NC stands for Numerical Control Machine: CNC stands for Computer Numerical Control machine. Stepper motor is used as a Drive unit. A servomotor is used as a Drive unit in CNC Machine. Tape reader system is used for the generation of program. A mini computer is used for the generation of program in the from of a file. The CNC program can be written, stored, and executed directly at the CNC machine. 3. Any portion of an entered CNC program can be played back and edited at will. Tool motions can be electronically displayed upon playback. 4. Many different CNC programs can be stored in the MCU. 5. Several CNC machines can be linked together to a main computer. NC Machine Tools 1.2.1 Types of NC System Machine controls are divided into three groups: (a) Traditional numerical control (NC); (b) Computer numerical control (CNC); (c) Distributed numerical control (DNC). The original numerical control machines were referred to as NC machine tool. They These types of cnc machines pdf produce homogeneous work pieces that have little to no errors, which makes the products marketable because of their improved quality. types of cnc machines pdf are beneficial as they require less human labor. They are automated to cut down on production costs. motion as is required on most conventional machine tools, CNC machines allow motion control in a revolutionary manner. •All forms of CNC equipment have two or more directions of motion, called axes. These axes can be precisely and automatically positioned along their lengths of travel. •The two most common axis types are linear (driven along a Machines Using CNC: Machine Types: Lathe . The engine lathe, one of the most productive machine tools, has always been an efficient means of producing round parts (Fig.4). Most lathes are programmed on two axes. • The X axis controls the cross motion of the cutting tool. Negative X (X-) moves the tool Machines Using CNC Early machine tools were designed so that the operator was standing in front of the machine while operating the controls. This design is no longer necessary, since in CNC the operator no longer controls the machine tool movements. On conventional machine tools, only about 20 perce