An essential part of the machining process, securing the right finish can be the difference between a returning client and a dissatisfied customer. But with so many options available, it can be difficult to determine what form of finish to settle on. So, what exactly is CNC finishing and what options are available to support your custom or bespoke parts?
What is CNC Machining?
Computer numerical control (CNC) machining uses pre-programmed software to control the movement and actions of shop equipment. This helps to automate the process, allowing companies to operate with increased capacity without compromising quality. While this also helps to eliminate error, the process primarily allows operators to complete complex tasks and supplement professional experience – letting clients enjoy a product that combines human expertise with the error-free actions of a machine. This does mean that every part produced will have an ‘as milled’ finish. If your product requires additional care or is set to provide a specific purpose, it will need to be finished out correctly.
What options are available?
When it comes to finishing, some key options include, but are not limited to:
Standard Finish: The item is left ‘as is’ and retains the same exterior it had once the CNC process completed. This will often have several cosmetic blemishes but will be otherwise fit for purpose.
Bead Blast: The surface of the item is abraded with beads to remove surface imperfections or prepare it for additional coating or treatment. Depending on the hardness of the material this can involve glass, shot, or sandblasting to achieve the desired effect.
Anodising: Available in ‘type two’ and ‘type three’ options, these are coatings that are evenly applied to the item. Type two involves the direct application of acid to create a corrosion resistant coating and can be subsequently dyed. Type three involves the application of aluminium oxide and is commonly applied to aluminium items or softer wearing metals.
Powder Coating: This is evenly sprayed across the items and then hard-baked by passing the part through an oven. This creates an additional level of protection and often forms part of an after-care program that involves the application of other aesthetic and functional elements.
If you are struggling to find the right finishing for your machined parts, our team at Standish Engineering Co Ltd are here to help. Fully ISO 9001 & RISQS certified, we understand the important of providing the highest possible standards of professional care when it truly matters most. You can review our full list of machining services from here to learn more about our work and level of service we provide to out clients. If you want to learn more or have specific questions about your needs, you can contact us directly and let our in-house team know exactly what you need to secure the parts you need today.