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What are CNC Machining Services?

Updated on February 10, 2014

Precision Machinery


CNC Machining Services

CNC stands for Computer Numerical Control and this was originally developed in the 1950s by the US Air Force and the Massachusetts Institute of Technology (MIT) for the precision manufacture of helicopter rotor blades.

In many industrial processes it is necessary to produce parts for larger items which may be required to be repeated hundreds or even thousands of times in a day. For example, think of parts for cars, or for lighting, for electric motors, for refrigerators, or screw caps for wine bottles. All of these need to be produced in their thousands - all identical - and to just the same degree of accuracy and a CNC machine can achieve exactly that.

Computer Controlled

Basically a computer controls the various movements of the machine to produce parts for almost anything. Machines that can be thus controlled include routers and grinders, lathes and mills.CNC machining is more precise than hand machining and can be repeated over and over, as often as is needed. Because of the precision obtainable, three-dimensional objects of extremely complex shapes can be produced.

When you go into a machine shop of any size, there will usually be a display cabinet in the reception area showing dozens, if not hundreds of examples of the products that the company has produced on their machines ranging from simple nuts or bolts to the ultra complex shape. Furthermore, products can be manufactured from metal, wood, plastic and any kind of material.

In order to produce an article a CAD (Computer Aided Design) drawing is produced either in 2D or 3D and then a code, called a G code is created to run the CNC machine. This will be loaded on to the machine and a test run, known as "cutting air", as no material is used, is run to ensure that everything works as it should. This is a vital step, since if there is anything wrong with the program the result would be either faulty products, or a damaged machine, or both.

CNC Machining

CNC Milling

Numerical Control

CNC machining can be used to automate almost any manufacturing process no matter what niche is involved. For example, in metal fabrication industries CNC milling machines can weld, punch, shear, laser cut and flame cut metal.

Numerical Control (NC) is the automation of tools that are run by randomly set orders encrypted to a storage space medium, in contrast to regulated manually by levers or manual wheels, or automated mechanically by CAMs alone. Most NC in the present day is CNC, Computer Numerical Control, in which computer systems are indispensable.

In today's CNC systems, end-to-end element design is completely automated utilizing CAD and CAM programs. These develop a computer system file which is decoded to find the orders required to run the machine through a post-processor. This is then uploaded to the CNC machines for manufacturing. Modern-day devices generally integrate various tools into one single cell, to accommodate the necessity of several tools for a single component.

The machine, once set up, will run for days or even weeks turning out identical parts one after the other with very little input required from the operator: To achieve the same result by hand machining would be impossible.


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    • profile image

      Multiscore Engineering 4 years ago

      Cnc machining greatly helps OEMs. Thanks for the great informative post.

    • vagobond44 profile image

      vagobond44 4 years ago

      Thanks for taking the time to read and comment, jabelufiroz, and for the votes.

    • jabelufiroz profile image

      Firoz 4 years ago from India

      Hi Vagobond. Visited your site

      Seems the article matches with your operations.

      Voted up and useful.