Casting creates less internal stresses, so cast acrylic is less brittle than extruded acrylic and is more optimal for CNC machining processes. There are two manufacturing methods for making PMMA for CNC machining applications: casting and extruding. It is relatively easy to machine, tough (more than 10x tougher than silicone glass) and easy to handle, making it a popular choice for even complex parts. PMMA is a popular choice for CNC machining because it’s easy to work with and can be machined to precise tolerances. For example, when this article was published, a 12”x12”x0.25” borosilicate glass sheet cost $49.60, but a 12”x12”x0.25” clear acrylic sheet cost $8.46 - that’s a huge difference in price! It’s also used in applications where it’s subjected to wear and tear, such as automotive parts.Īcrylic is also a popular substitute for glass because of its cost effectiveness. These physical properties make PMMA well-suited for applications where transparency is important, such as signage and displays. Due to its phyical structure, PMMA is also resistant to UV light and has good weatherability, making it suitable for outdoor applications. PMMA, or polymethyl methacrylate, is a type of plastic known for its transparency, strength, and durability. What is PMMA and Why is it Used in CNC Machining? The program is designed to accurately follow the instructions provided by the user to perform precise and repeatable cuts and shapes.
In CNC machining, a computer program is used to control the movement of the machinery, which can include lathes ( CNC turning), mills, and 3D printers. What is CNC Machining?ĬNC (computer numerical control) machining is a manufacturing process that uses computer-controlled machinery to cut, shape, and finish materials. This versatile plastic may also be injection molded, though we won’t be covering that in this article. In this article, we’ll provide a simple guide to understanding the basics of PMMA CNC machining, properties of PPMA, and common utilizations of PMMA CNC machined parts. One common method for shaping and finishing PMMA is CNC machining. PMMA has numerous modern-day applications and some highly useful properties. PMMA plastic is an excellent alternative to glass and polycarbonate because it’s naturally transparent and has a glass-like appearance. Polymethyl methacrylate (PMMA) is a transparent amorphous thermoplastic homopolymer that’s also known as acrylic or acrylic glass.
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