Sean Thomas

All articles from the author

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Stress Concentrations: How to Identify and Reduce Them in Your Designs

In today’s world, products are getting increasingly complex, with downward pressure on overall pricing. This has led to an inevitable increase in the geometric complexity of mechanical components. While this has allowed components to perform multiple functions, it has led to complex load transfers and possible concentrations of stresses. A stress concentration is defined as […]

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Threaded Locking Methods for Secure Connections

Threaded connections, such as bolts and nuts, are used in a wide variety of applications, ranging from plastic toys to massive bridges. The one similarity that ties them together is that these connections need to stay together when we want them to, but also come apart when needed. For example, the valve covers on an […]

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Design Methods to Improve Torsional Rigidity

Products that are subject to a torsional load often require analysis similar to what we use for bending stiffness. The main differences are the specific material property to be used (Shear Modulus of Rigidity) and the polar moment of inertia (which is very similar to the area moment of inertia used in bending). If we […]

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How to Conduct a Tolerance Analysis for 3D Printed Parts

In the world of mechanical product design, engineers and designers complete what is known as a tolerance analysis or tolerance stack up analysis on an assembly as they prepare to send the components out for manufacturing. This is done to ensure when you order parts, they are manufactured to dimensions that guarantee the components within an assembly […]

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Heat Sink Design Guide

In a world of ever-increasing electronics, our lives are continuously impacted by devices that incorporate some sort of heat-generating circuitry. When it comes to electronics that dissipate power in the form of heat during normal operation, it is often necessary to manage this heat, to ensure the components don’t exceed their maximum allowable temperatures. One […]

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How to Conduct a Failure Modes and Effects Analysis

In the product design world, it’s common to use a tool called a Failure Modes and Effects Analysis (FMEA) to improve a design or process. FMEAs are commonly separated into two different categories, depending on their application: A Design FMEA (D-FMEA) is used in product design to identify possible design weaknesses and failure modes. A […]

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How to Design for Stiffness Using Material Properties

‍In my last article, we discussed methods of improving part stiffness through geometric changes and why that is an important tool. Here in Part 2 of the “Designing for Stiffness” series, we’ll be looking at changing part stiffness through material properties. We’ll use many of the same formulas, but we’ll focus on the properties we […]

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How to Design for Stiffness Using a Geometric Approach

Designing products for load bearing applications can pose a multitude of challenges, so it’s important for a designer to have a “toolbox” of techniques that improve design quality. Designing for stiffness through geometric controls is a top tool in that box. Even the simplest designs can be sensitive to part stiffness: For example, if a […]

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From Snap Fits to Adhesives: A Comprehensive Guide to Mechanical Fastener Options

Fictiv’s guide to fasteners for 3D printed parts includes an overview of threaded inserts, self threading screws, designing threads into your model, captured hex nuts, and cutting threads with a tap. Today, we’re going to dive in a bit deeper with a more comprehensive guide to all the options available for fastening plastic assemblies, including: […]

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Best Practices for Adding Ribs and Gussets to 3D Printed Parts for Structural Integrity

When designing components that will be made of plastic, it’s often necessary to add ribs and gussets to improve the stiffness and strength of load bearing features. This reduces material volume and print time for 3D printed parts, compared to the time it would take to make these features out of solid structures. That’s because print […]