Similarly, this type of plastic does not wear well. With a maximum working temperature of 150°F, it can easily overheat. Also, frictional forces for CNC acrylics will quickly degrade the plastic.

For machining considerations, acrylic has its place in the world of plastics. As it's a harder material than most, it has an excellent ability to hold close tolerances. On smaller dimensions, tolerances of +/- 0.0005 inches are possible, but machines can be even more precise than that. Finishes directly from a machine tool can measure less than 2 micro inches Ra. A 32 Ra-max finish for an entire part. For most machining vendors, this should be standard.

Cast acrylic for machined plastic parts come as both domestic-grade and import-grade. Import-grade acrylic is significantly lower in cost than domestic-grade. However, be warned the dimensional stability and stress-cracking resistance of import-grade are lower than domestic-grade. Whether you’re sourcing domestic-grade or import-grade acrylic for your plastic machining needs, the basic cost of either is about 15 -25% higher than Delrin in the lowest quartile of machined plastics. See all material costs comparisons here.

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Moreover, acrylic has a weak chemical resistance. When exposed, acrylic machined parts will stress crack. Simply wiping an acrylic component with isopropanol will degrade a clear surface over time. For a list of which chemicals work against acrylic, visit our chart.

Although general-purpose grade cast acrylic polished parts will block UV wavelengths up to 360 NM, consider UVT grade for any application requiring transmittance of 280 NM and above. Polishing of acrylic allows for many novel edge lighting approaches, including the possibility of total internal reflection.

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Lastly, on the ease-of-machining scale (stability, abrasiveness, burr formation), acrylic machining is a 3.7, landing in the lowest one-third of stock shape plastics.

Acrylic is also available in a wide range of colors, both opaque and translucent. Since many use this plastic as sheet material for signage, it has the broadest range of hues on the shelf.

Acrylic (aka, polymethyl methacrylate (PMMA)) is one of the most popular plastics for CNC machined parts, particularly in medical and diagnostic applications. Known as a transparent thermoplastic, it machines well, holds tight tolerances, is relatively low cost, and offers optical clarity if needed.

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Controlled Fluidics' experienced machinists can produce a smooth, burr-free finish, even when the part requires a complex geometrical design with cleanly drilled intersections.

However sometimes after CNC machining, this type of plastic may only be translucent. Fortunately, there are post-machining techniques (e.g. polishing) that will restore a plastic machined part’s original transparent quality.

One of the primary benefits of choosing acrylic for a machined plastic part is clarity. Designers have often referred to optical acrylic as "plexiglass" or "acrylic glass" when such specifications are crucial. In its native, tint-free state, its ability to make optical grade components make this material versatile in its use and availability. With raw materials available in stock shapes such as rods, sheets, or tubes, this type of plastic retains that clarity while offering light transmission of up to 92% post manufacturing.

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True optical acrylic machining can create lens-quality finishes on flat surfaces and turned shapes. This method requires specialized optical machining equipment.

Acrylic material comes as either cast or extruded. Many use cast acrylic in CNC machining applications because it is stable and available in a wide range of sizes and configurations. For the usual stock plastics shapes, cast acrylic is readily available in all sheet sizes, including extra-thick material above 4 inches. It is also possible to source rods and tubes. Extruded acrylic is typically used in sheet applications and is only available in thinner gauges. By comparison, extruded acrylic is lower in cost and more impact resistant but softer than cast.

When deciding on materials, its best to know their pros and cons. And like every material, an acrylic machined part has limitations. Avoid using acrylic parts as structural members since the material is stress-sensitive. Bending stress and over-tightened fasteners can cause cracking.

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Accusize Industrial Tools was born in Toronto, Canada, in 2008. As a Canadian distributor, Accusize Industrial Tools serves the metalworking customers with high-quality measuring tools, cutting tools, and machine tool accessories at a very competitive price.Accusize Industrial Tools do the best to listen and respond to our clients' needs.