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The ultimate goal of DFM (Designing for Manufacturing) for CNC machining is to design parts that achieve the design requirements while reducing the complexity of machining operations and the potential for quality issues. When designing for CNC machining, the maxim, simplicity is the ultimate form of sophistication, applies. Despite its automated nature, CNC machining can […]
Article
Ductility, strain, and toughness are fundamental concepts in the field of engineering, particularly in materials science and mechanical engineering. Ductility is a measure of a material’s ability to deform plastically (permanently) before fracture. In other words, it’s a measure of a material’s ability to stretch or bend without breaking. Ductile materials, such as copper and […]
Article
Acrylic is a clear and commonly used injection molding plastic. The chemical name for acrylic is Poly(methyl methacrylate), which can be shortened to PMMA. The main advantage of injection molded acrylic is its transparency and shatter resistance. Acrylic is also strong and lightweight, which makes it a great substitute for glass. In addition, PMMA resists […]
Article
Polycarbonate injection molding is used to produce parts from polycarbonate (PC) plastic, a tough, transparent, and heat-resistant polymer with applications ranging from automotive parts and electronic components to consumer products and medical equipment. Polycarbonate is a commonly used thermoplastic that combines high durability and impact resistance with excellent mechanical properties such as high strength, stiffness, […]
Article
Nylon is an engineering thermoplastic and commonly used injection molding material that is a polyamide (PA). It exhibits high crystallinity, an important attribute that improves a plastic’s mechanical strength and thermal performance. Nylon’s material properties support its use as a replacement for metal and make it a good choice for pump parts, fan blades, cable […]
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Polyethylene injection molding produces parts from polyethylene (PE), the world’s most commonly used plastic material. This thermoplastic polymer has a variable crystalline structure that, in part, determines its material properties. With plastics, the degree of crystallinity has a significant effect on hardness and density. In turn, this affects attributes such as stiffness and flexibility. Applications […]
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POM injection molding produces parts made of polyoxymethylene (POM), an engineering thermoplastic that includes both homopolymer and copolymer versions of acetal. Homopolymer acetal has a highly ordered crystalline structure for increased strength, but can be difficult to process because of its precise melt temperature. Copolymer acetal has a wider range of processing temperatures, but is […]
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This article was originally published in February 2017 by Humberto Villasenor. The content has been updated. Understanding the differences between the mechanical properties of strength vs. stiffness vs. hardness is foundational in mechanical engineering, yet these properties are often confused. These properties are related, but they have important differences: For this article, we’ll review the […]
Article
Fluid mechanics is one of the four branches of mechanics, the study of how fluids behave at rest or in motion — and you’re likely to use this knowledge as an engineer in real practice fairly often. I have used fluid mechanics to design heat exchangers for airplanes, to predict the flow of chemical solutions […]
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Many additive manufacturing processes offer low cost per part, high dimensional tolerances, and fast cycle times, but selective laser sintering (SLS) is one of the best options. SLS’s speed, resolution, and laser accuracy combined with advances in the raw materials allows for rapid iteration and high-quality finished parts. The self-supporting nature of the process enables […]
