How to Create Mechanical Gears

There is something quietly miraculous about a well-cut gear. It is one of the oldest pieces of human technology still in daily use, and yet, when two gears mesh smoothly under load, they accomplish something that feels almost like magic: they translate motion, multiply force, and divide speed with an exactness that nothing else in mechanical engineering quite matches.
How to Create Mechanical Gears is the practical, illustrated guide for makers and hobbyists who want to actually cut a gear — not just read about one. Whether you plan to file a brass clock wheel by hand, mill a hardened steel pinion, print a working planetary gearbox in PETG, or laser-cut a wooden clock train, the underlying geometry is the same. Master that geometry once, and every manufacturing method opens up to you.
The book moves from the involute curve and the dividing head through module and diametral pitch, then into the workshop itself: complete chapters on the milling machine, lathe, 3D printer, laser cutter, casting setup, and the traditional clockmaker's hand-filing method that produced finely-toothed gears for three centuries before electric motors existed. Material selection covers steels, bronzes, plastics, and woods. The mathematics is explained without an engineering degree, the equations are spelled out clearly, and every concept is followed by what it actually means in the shop.
Two complete buildable projects close out the book: a 4:1 single-stage reduction gearbox in mild steel, worked through from specification to finished part, and a wooden pendulum clock with its weight-driven gear train and escapement. Inspection, troubleshooting, lubrication, and a real bibliography pointing to the AGMA and ISO standards, the classic texts by Buckingham and Dudley, and the working hobbyist references by Ivan Law and Brian Law round out a book designed to be both an introduction and a long-term shop companion.
This is the middle ground that has been missing from the gear literature: enough theory to make confident design decisions, enough shop-tested instruction to make actual chips. Hobbyist machinists, makers, 3D-printing enthusiasts, clockmakers, model engineers, and engineering students will all find what they came for.
Pick up your calipers. Let's make some chips.