The strongest and many durable of materials also are very hard to process, hence the hardest tool materials are needed. Manufacturing aerospace parts is really a complex technological process with lots of consecutive machining methods.For example, a titanium part has to be milled/turned several times with varying velocity and feed, it's ground using a number of different grinding wheels and polished to perfection. Such precision is not possible without the prototype machining technologies.

The Advantages of CNC Machining for Prototyping
For creating prototypes of parts, CNC machining incorporates a number of advantages over 3D printing along with the other prototyping technologies discussed in this posting, but in addition some downsides.

A second advantage of prototyping with CNC machining is the machines can also work with materials which can be either unavailable or too costly to use along with other prototyping technologies. Even for perhaps the most common material like aluminum, creating prototypes via CNC machining is a lot cheaper than 3D printing.

One with the biggest benefits of using CNC machining to produce prototypes — particularly for parts that can eventually be manufactured by injection molding — is CNC machining produces prototypes created from solid materials, unlike 3D printing. This means that the mechanical properties of CNC-machined parts are incredibly similar to the properties of injection molded parts.

Finally, CNC machined prototypes can be achieved with very high-quality completes. Depending upon the pad selected, and based upon any post-processing techniques used, CNC machined parts may be left as-machined, bead blasted, anodized, powder-coated, sanded with some other grits into a polished surface, or chrome plated.

Compared to 3D printing which leaves layer lines, or laser cutting that could leave scorched edges, CNC-machined prototypes may have a high enough surface quality for everyone as final prototypes for presentation in the crowdfunding campaign maybe in marketing materials.

Finally, CNC machined prototypes can be achieved with very high-quality comes to an end. Depending upon the information selected, and based on any post-processing techniques used, CNC machined parts is usually left as-machined, bead blasted, anodized, powder-coated, sanded with some other grits right down to a polished surface, or chrome plated.

Compared to 3D printing which leaves layer lines, or laser cutting that may leave scorched edges, CNC-machined prototypes could have a high enough surface quality to provide as final prototypes for presentation within a crowdfunding campaign or perhaps marketing materials.