Difference Between NC and CNC:
NC (numeric control) & CNC (computer numeric control) are systems implemented in various industries and factories with different machining tools. These controls are mainly distinguished by the fact that NC is the traditional control that allows the use of information already entered in the machining process. Conversely, CNC goes one step further by providing greater flexibility and capability. CNC is capable of handling logical tasks.
The NC machine is a machine controlled by a set of instructions in the form of numbers, letters, and symbols called programs. The CNC machine is used to control the speed of the workpiece and tool with computer programs written in alphanumeric data. The program includes the construction method as well as precise instructions about the movements. In the NC machine, the program is fed into the punch card.
In a CNC machine, programs are fed directly into computers using a small keyboard. It is very difficult to modify the programs in the NC machine if some error occurs and requires debugging. In a CNC machine, the programmed action is very easy. For NC machines, you have to change the program to tape and feed it to the machine again for even a small change. In CNC machines, you just have to change the variable in the computer to modify the program.
This machine has memory storage, and programs can be stored under its control. The NC machine requires a highly-skilled operator to operate. For a CNC machine, the less efficient operator will work. Maintenance costs are lower for NC machines than for CNC machines. You can buy CNC auto parts in Mumbai at reasonable prices. Programs cannot be stored in NC machines. Whereas in CNC machines, the program can be stored in a computer and used repeatedly.
Difference between NC & CNC In today’s world, every construction industry wants high accuracy products in a short time. And this complexity of high accuracy in minimum time can be achieved with the use of NC and CNC machines. Most of us do not know the basic differences between these machines.
The various differences between NC and CNC machines in tabular form are as follows:
|1||It is defined as a machine that is controlled by a set of instructions in the form of numbers, letters, and symbols. The group of instructions is called a program.||It is defined as the machine that is used to control the speed of the workpiece and tool with the help of programs prepared in the computer. The program is written in alphanumeric data.|
|2||Description: NC is a machine controlled by a set of instructions in the form of numbers, letters, and symbols.||Description: CNC is a machine that is used to control the speed of the workpiece and tool with the help of a program designed in the computer.|
|3||Nature: NC is a hardware-based type of system.||Nature: CNC is a software-based system.|
|4||Program: The program is fed into a media tape/punch card.||Program: Programs are fed directly into the computer by a small keyboard similar to our traditional keyboard.|
|5||Operation: It is not possible to run the NC machine continuously.||Operation: It can be run all day (24 hours).|
|6||Accuracy: NC machine has lower accuracy as compared to the CNC machine.||Accuracy: Products developed by CNC machines are high-quality products with high precision and accuracy rates.|
|7||Program modification is difficult.||Modifications to the program are very easy.|
|8||The cost of an NC machine is less than that of a CNC machine.||The cost of a CNC machine is higher than that of an NC machine.|
|9||Flexibility: NC machines provide less flexibility and computational capability.||Flexibility: The NC machine provides additional flexibility and computational capability.|
|10||NC machine has lower maintenance cost as compared to CNC machine.||The maintenance cost of a CNC machine is higher than that of an NC machine.|
|11||Skills: The operation of NC machines requires a highly skilled operator.||Skills: A semi-skilled operator can run a CNC machine. The main requirement is that the operator should have basic knowledge of computer systems.|
|12||Working: It works on XY and straight-line axis.||Working: It works on the X-Y-Z axis.|
|13||This requires more time to execute a task.||Execution time: The execution of the work takes very little time.|
|14||Storage of programs: Programs cannot be stored in NC machines.||Storage of programs: Programs can be stored in a computer and used repeatedly.|
|15||Once indexed, the operation parameters cannot be changed.||Operation parameters can be easily changed.|
|16||This provides less flexibility and computational capability.||This provides additional flexibility and computational capability.|
|17||In NC machines, the program is fed into a punch card.||In CNC machines, programs are fed directly into the computer by a small keyboard similar to our traditional keyboard.|
Definition of Numeric Control (NC):
NC systems use fixed logical functions to handle a machine’s tool or a machining process. The NC specifies the control of the movements of the machine and various different functions with the help of instructions indicated as a sequence of numbers. The electronic control system drives these NCs. However, we cannot change functions in NC, which means that it is not programmable due to the rigid wiring of the controls logic and is considered hardwired.
To feed instructions in NC machines, an external medium is used, such as paper tape or magnetic tape. It processes the information received from this tape step by step, which is stored in the memory of the control system called ‘buffer storage.’ Therefore, when the machine is working on a single instruction block, it reads the next block from tape and is saved in the memory of the machine control system.
Definition of Computer Numeric Control (CNC):
CNC stands for, and it is generated by merging the computer with numerical control. So, how does it differ from the NC system? It uses internal microprocessors (computers) consisting of memory registers—the memory register stores various routines that can successfully manipulate logical functions. As a result, a machine operator is able to change the program only on control. This is very beneficial for CNC machines. Unlike NC machines, CNC machines store programs and logical functions in specialized computer chips, so it is called software.
Features of Computer Numeric Control (CNC):
Complementary features of CNC that were not available with NC machines are: The part program can act as an input to the controller unit with the help of a keyboard or paper tapes so that it can be read by a tape reader within the control unit. The included part program can be used repeatedly.
We can also revise and optimize part programs on the machine tool itself. It uses special sub-programs built for repetitive machining sequences to reduce input information. CNC machines can also show the result in different forms without actually executing the part program on the machine tool.
CNC machines allow coverage for any change in modifications in the dimensions of the cutting tool. It also provides information about the use of the machine, which is useful for management.
Conclusion of NC and CNC:
The main difference between CN and CNC machines is that NC uses perforated cards directly to control machine tools. On the other hand, CNC employed a computer that interfaces with various MCUs (machine control units) from which information flows.