How lawn mowers are made
A budget mower's deck starts as one flat sheet of steel and becomes a dome in a single stroke of a press.
- stations
- 8
- things upstream
- 64
- raw sources
- 22
- steps from the ground
- 10
The short version
Under most push mowers is a deck pressed from a single steel sheet in one stroke of a high-tonnage press. The deck is primed and powder coated, a hardened steel blade is balanced and bolted to the engine's crankshaft, and workers add wheels, handle and safety controls. Each machine is test run before it ships.
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Draw the deck
A high-tonnage press pulls a flat sheet of steel into a deep bowl with no joints in one stroke. The curves and domes stiffen the shell, so thinner steel can behave like thicker plate. Heavy commercial decks are instead laser cut and welded from thicker plate.
12 to 14 gauge steel
Goes in -
Prime and powder coat
Steel decks get an electrodeposited primer, then robot arms spray powder that an oven bakes into a hard skin. Grass juice, fertilizer and salt attack bare steel, and the underside fails first.
Goes in -
Harden the blade
The blade is cut from steel harder than the deck and then heat-treated so it keeps an edge through sticks and stones.
Goes in -
Balance the blade
Each blade is balanced to tight tolerances. Even a slight heavy end shakes the machine and wears out bearings and engine mounts.
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Mount the engine
A small one-cylinder four-stroke engine, usually bought from an engine maker, bolts to the deck with its crankshaft pointing down. The blade bolts straight onto that shaft.
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Add wheels and handle
Workers fit the wheels, the height-adjustment levers, the handlebar and the controls. Self-propelled models also get a transmission driving the wheels.
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Fit the safety gear
A discharge guard goes over the chute, and a bail lever on the handle stops the blade when the operator lets go.
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Run the final checks
Technicians check blade speed, confirm that the stop lever brakes the blade, and measure engine output before the machine is boxed.
Worth repeating
- Edwin Budding's first mower, built around 1830, had a frame of wrought iron.
- Steel gauge runs backward: an 11-gauge mower deck is twice as thick as a typical budget deck.
- A reel mower's spinning blades need not touch the cutting bar, because a gap thinner than a grass blade still slices it.
Back to the ground
Follow every input upstream and lawn mower starts as these 22 raw sources.
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Sources
- Lawn mower
- Deep Drawn Metal Stamping Lawn Mower Decks
- Fabricated Deck vs. Stamped Deck
- How Lawn Mowers Are Made: Seven Manufacturing Stages
These sources say little about the factory steps themselves, so parts of this line are a general description. Treat the details with care, and tell us if you know better.
Cite this page: "How lawn mowers are made." Assembly Line, 2026-11-03. https://assemblyline.org/make/lawn-mower