Sheet metal CNC manufacturing is a subtraction process, which starts with the machinist directly programming the machining center from your CAD file. Machining centers use tools of different sizes and shapes to remove materials from solid metal or plastic blocks to show the shape of the part. For large or highly complex parts, Changzhou Sheet Metal Manufacturing will use sheet metal CNC manufacturing to manufacture "prefabricated" parts, where the parts have been sectioned in CAD files and processed in these sections, and then technicians will glue these sections together to form a complete part.

Machined parts made of sheet metal CNC prototype are durable, manufactured with production materials, with high precision and good surface finish. These parts can be painted or polished to produce highly beautiful or clear prototypes from the parts used in production.