Sheet metal fabrication and CNC machining are both commonly used processes in the manufacturing space; however, the two processes are very different, suiting different designs and operating in very different ways. Understanding the strengths and limitations of both these processes can help you to make the right choice for your project, so let’s look at them in more detail.
CNC machining
CNC stands for computer numerical control. This is where machines such as lathes, routers, and mills are guided by a programme’s instructions to remove material from a solid block, which is often called a blank or a workpiece. CNC machining is basically a form of subtractive manufacturing in that it takes something away. The machines will cut, drill, bore, or transform the metal material into its finished component.
CNC machining is typically the best method to use for complex and high-precision parts and pieces, 3D shapes that can’t be created using flat sheets of metal, prototypes, and high-performance components.
Sheet metal fabrication
This process begins with flat sheets of metal, which are then transformed into parts, components, or structures. The process is a forming process; rather than taking material away, the material is reshaped and transformed into something else.
Tools such as laser cutters, welders, and press brakes are used in the process to build anything from brackets and ductwork to cabinets. This method best suits parts that are pretty uniform in thickness, panels and enclosures, and large-scale production. Companies such as https://dkmsheetmetal.co.uk can assist with sheet metal fabrication projects.
The differences
Firstly, CNC machining begins with a solid block of metal or material, whereas sheet metal fabrication starts with a simple flat sheet. CNC machining takes material away to create a part; in sheet metal fabrication, a part is formed from the material.
CNC machining is best for really complex parts or components, with 3D shapes, tight tolerances, and finer levels of detail. On the other hand, sheet metal fabrication is the best option for parts with uniform thickness and large-scale production efforts.
