Look at a modern car’s front wheels and you’ll see shiny metal discs behind them — brake rotors. Look at the rear wheels of many budget cars and you might see drums — closed metal cylinders doing the same job in a completely different way. Both brake systems stop your car, but they do it…
Look around the room you are sitting in right now. Phone case, keyboard keys, pen bodies, bottle caps, chair armrests, the dashboard of a car, the casing of almost every electronic device. Chances are, a huge share of the plastic objects you see every day were made by a single process: injection molding. It is…
Metal is supposed to be rigid — that’s the whole point of building an engine out of it. But under the right (or rather, wrong) conditions, the metal that forms your engine block and cylinder head can slowly twist out of shape like a warped record left in the sun. It’s called warping, and it’s…
Walk into any sports car showroom, board an airliner, or pick up a fishing rod, and you will meet the composite materials family. These are materials made by embedding strong fibers in a resin matrix, and the two most famous members of the family are carbon fiber and fiberglass. They look similar at a glance,…
Between the simple MacPherson strut on economy cars and the classic double wishbone on race cars sits a design that quietly dominates the premium end of the market: the multi-link suspension. It’s more complex, more expensive, and more capable than either of its famous cousins — and it’s the reason many modern luxury and sport…
“How long do brake rotors last?” is one of the most common questions at any repair shop — and the answer frustrates everyone who asks, because it’s always “it depends.” Rotor lifespan varies wildly from car to car and driver to driver. The good news is that rotors give plenty of warning before they fail,…
Ask an engineer what makes a good knife, a strong gear, or a durable bearing, and the word “hardness” will come up fast. Hardness is one of the most fundamental properties of a material, and it determines how well a part resists scratches, wear, and deformation. But here is the catch: hardness is not a…
Every car needs springs — the suspension parts that carry the vehicle’s weight and absorb bumps. But not all springs are created equal. If you’ve ever looked under a pickup truck and seen flat metal strips stacked together, that’s a leaf spring. Under most modern cars, you’ll find coil springs — big spirals of spring…
Not long ago, “3D printing” meant one thing: a desktop machine squeezing melted plastic through a nozzle. Today, the term covers a family of very different technologies that build objects from digital files, and the differences between them matter enormously. The machine that prints a plastic prototype on your desk shares almost nothing with the…
Designing a product used to be a slow, human-driven process. An engineer would sketch an idea, model it in CAD, test it, refine it, and repeat, often dozens of times. Each iteration took hours or days, and the final design was limited by the designer’s imagination and experience. If you wanted a stronger bracket or…
