How washing machines are made
A plastic and cement balance ring of over twenty pounds is what stops a washing machine walking across the floor.
- stations
- 12
- things upstream
- 106
- raw sources
- 31
- steps from the ground
- 10
The short version
Coils of zinc-coated steel feed the presses that shape most of a washing machine, while plastic pumps and guards come from injection molds. A rolled and welded drum becomes the spin tub. On the conveyor, workers stack transmission, balance ring and tubs into a module, lift it onto the base with springs, and add motor, controls and cabinet. Each one is filled with water and run.
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Press the sheet parts
A press squeezes steel between two halves of a die, feeding straight from the coil where it can. One die alone tends to wrinkle or tear the metal, so most parts pass through several. The steel usually carries a zinc coating against rust.
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Mold the plastic parts
Melted plastic is forced into a steel mold at high pressure, and water running through the mold sets it. Ejector pins push out the part, often leaving small circles you can spot later. Pumps, tub guards and agitators are made this way.
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Roll and weld the drum
Sheet is rolled into a drum and its side is welded and smoothed. An expander stretches it to final shape, and a bottom is welded on. Stainless tubs are polished so they will not snag clothes, and others get a fired-on porcelain coat. One patent describes stamping each water hole and drawing its rim into a small funnel to round off burrs, and another butt welds a front-loader's steel tub the same way.
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Cast the gearbox parts
On belt-driven agitator machines, ingots of aluminum are melted and ladled into die cast molds. Machines then drill the rough castings and shave critical faces. Workers bolt and press in shafts and gears and add a metered dose of oil.
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Seal the pump
Robots set the impeller and seals into the cover and body, and heat or vibration fuses the housing shut. Air is then used to check every pump for leaks.
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Weight the balance ring
A plastic ring with metal melted into it for strength receives a fill of cement and is balanced precisely. The finished ring tops twenty pounds and steadies the machine in use.
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Powder coat the panels
Parts hang from an overhead conveyor with one electrical charge while a flour-fine powder paint is sprayed with the opposite one, so the two attract. An oven then melts the powder. Some makers buy prepainted steel, which is cheaper but leaves cut edges bare.
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Build the tub module
The wash tub rides a conveyor while the transmission goes onto a bearing bolted to it, along with the balance ring, brake and drive pulley. A hydraulic lift raises the module onto the base, and springs tie the two together. Inside the wash tub, the spin tub bolts on.
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Bolt on motor and pump
The pump and a bracket bolt to the motor, which gets a shield against leaks. The set is fixed to the base and tied to the module by a belt and hoses. Direct-drive designs leave out the belt.
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Wire controls and cabinet
Controls mount behind a printed panel, and the wiring comes as a single bundle that clips on at one end and runs down to the motor. A robot lowers the heavy cabinet into place, and it is bolted to the base. Many now run on microcontrollers.
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Fill and run it
The finished washer is filled with water and listened to and watched for noise, vibration and visual defects, and its controls are tried. Only after this does the front panel go on.
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Crate for the truck
A machine opens a flat carton, drops it over the washer, then folds and glues the flaps under pressure. A strap goes around the top because lift trucks carry the crate from there.
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Worth repeating
- The last wringer washer built in the United States came out of a Speed Queen plant in Ripon, Wisconsin, in June 1990.
- Scrap plastic from washer parts gets reground but goes only into hidden pieces, since its color cannot be held steady.
- Most modern European front-loaders have only a cold water connection and heat the water themselves.
Back to the ground
Follow every input upstream and washing machine starts as these 31 raw sources.
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Keep walking
Sources
- Washing Machine, How Products Are Made
- US5934110A, Laundry drum for a washing machine and tool for producing the same
- US7743480B2, Method of manufacturing a drum-type washing machine
- Washing machine
Cite this page: "How washing machines are made." Assembly Line, 2026-11-03. https://assemblyline.org/make/washing-machine