When to Use as Machined Finish for Your Parts (and when not)

In this video, we're going to explain when to use an as-machined surface finish for your CNC machined parts and why. We'll also elaborate on when to not use the as-machined surface finish for your CNC machined parts.

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00:00 Introduction. First, we'll explain what an as-machined surface finish looks like and why.

00:17 Prototyping. Here we discuss why using an as-machined finish during prototyping is smart.

00:33 Structural parts. Next, explain why structural parts could benefit from an as-machined finish.

00:42 Adhesive bonding. We're talking about the benefits of an as-machined finish for parts that require adhesive bonding.

00:51 Powder coating. Parts that are painted with powder can benefit from an as-machined surface finish.

01:04 Cost savings. An as-machined finish is very cost-efficient.

01:12 When to not use an as machined finish for your CNC parts, starting with aesthetically critical parts.

01:28 Low-friction applications. We'll discuss why it's not smart to use an as machined finish for any low-friction applications.

01:42 Food or pharmaceutical equipment. Next, you'll learn that an as machined finish might not be suitable for food or pharmaceutical applications and why.

01:59 Optical and electronic devices. Here, you'll find out why optical and electronic devices are usually not suitable for an CNC as machined finish.

02:13 Gaskets. Learn why gaskets are not suitable for an as machined finish.

02:22 Aerospace and automotive components. Learn that these parts often require extreme precision so an as machined finish might not be a great option.

02:42 Bearings and rotating parts. These types of parts benefit from a smooth and not rough surface finish.

02:55 Fluid dynamics. Finally, we'll discuss why components that transport fluids might be better off without an as machined CNC surface finish.


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Hubs is an online manufacturing platform that provides engineers with on-demand access to a global network of manufacturing partners. Users can easily upload their design, instantly receive a quote, and start production at the click of a button. Hubs is a Protolabs company.


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