Cnc Machining Case Study

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Chapter 2 Background Literature & Market Survey 2.1 Relevant literature search The first CNC machines were called NC machines. They had existed before small computers were common. Complex electrical circuitry controlled NC machines. The history of numerical control (NC) began when the automation of machine tools first incorporated concepts of abstractly programmable logic, and it continues today with the ongoing evolution of computer numerical control (CNC) technology. The first NC machines were built in the 1940s and 1950s, based on existing tools that were modified with motors that moved the controls to follow points fed into the system on punched tape. These early servomechanisms were rapidly augmented with analog and digital computers,…show more content…
The CNC in CNC Machining stands for Computer Numerical Control. On the surface, it may look like a normal PC controls the machines, but the computer's unique software and control console are what sets the system apart for use in CNC machining. Under CNC Machining, Machine Tools function through numerical control. A computer program is customized for an object, and the machines are programmed with CNC machining language (called G-code) that essentially controls all features like feed rate, coordination, location, and speeds. With CNC machining, the computer can control exact positioning and velocity. CNC machining is used in manufacturing both metal and plastic parts. First, a CAD drawing is created (either 2D or 3D), and then a code is created that the CNC machine will understand. The program is loaded, and finally, an operator runs a test of the program to ensure there are no problems. This trial run is referred to as "cutting air, " and it is an important step because any mistake with speed and tool position could result in a scraped part or a damaged machine. There are many advantages to using CNC Machining. The process is more precise…show more content…
While CNC has solved numerous manufacturing problems, it does not a cure all. There are times when a CNC process may not be the best approach. However, operators do not get tired during the production process. The devices of CNC machines provide an extraordinary level of accuracy and control to the machine tool motions. Wasted motion is cut out of the CNC operations program. More time is spent working on the part. there are other benefits of CNC systems as well. CNC machines provide consistent, dependable, and repeatable performance. In other words, they treat each part in the same manner. With CNC machines, there is fast job changeover. Many CNC machines store necessary tools in magazines. Like the disc changers that can play from numerous discs, tool magazines include the tools necessary to perform several operations. This creates less downtime and reduces part-handling time. Because one CNC machine, it can conduct multiple operations, there is no need to route parts to other machines. This streamlines the production process. In essence, CNCs offer great manufacturing flexibility, speedy changeovers, and improved

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