How cordless drills are made
Some cordless drills are programmed through their own battery terminals before they leave the factory.
- stations
- 9
- things upstream
- 90
- raw sources
- 28
- steps from the ground
- 9
The short version
Copper wire is wound onto a motor's iron core in a blur, and the spinning part is balanced so it will not shake at speed. Workers then drop the motor, trigger switch and a ready-made gearbox and chuck into one half of a molded clamshell, screw the other half on, program its chip and test it against a load.
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Wind the armature
Winding machines wrap copper wire around the stack of steel plates in the armature so fast the eye barely follows. In brushless motors the windings sit on the stator and magnets ride on the rotor.
Goes in -
Balance the rotor
A balancing machine spins each rotor, finds its heavy side and grinds a little metal off the plates. Some lines add a dab of weight compound instead. The dished scars on a tool rotor come from this step.
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Mold the clamshell
The body is injection molded as two mirror-image halves, often at a separate plant. One half sits in a fixture on the line with alignment pins pressed in.
Goes in -
Build the gearbox and chuck
The reduction gears, the clutch that slips before a screw head strips, and the chuck that grips the bit arrive as one sealed unit built elsewhere. It sits at the front of the motor.
Goes in -
Solder the trigger switch
A worker solders the heavy power wires from the switch assembly to the motor contacts. Thinner control wires clip on with plastic connectors.
Goes in -
Close the housing
Motor, switch and gearbox go into the clamshell, the second half drops on, and drop-down pneumatic screwdrivers set to a fixed torque drive the screws in a numbered order.
Goes in -
Program and load-test
A station writes the tool's settings, such as the temperature at which it shuts off, into its memory chip through the battery connector. Then the chuck is coupled to a dynamometer-style rig that loads the motor and compares it to the design limits.
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Pack the battery cells
Lithium-ion cells are wired in series with a control board that manages charging and discharging, then sealed in a plastic case that slides onto the handle. Packs at 18 V are the most common.
18 V typical
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Weigh the kit
Tools, batteries and chargers go into cases that are set on a scale. If the weight is off, something like a belt clip or manual is missing.
Goes in
Worth repeating
- The electric drill was patented in 1889 by two mining engineers in Melbourne, Australia.
- Early cordless drills ran on 7.2 V packs, and today 18 V is the most common.
- A lithium-ion pack can hold its charge for about two years on a shelf, while an old nickel-cadmium pack drains in 1 to 4 months.
Back to the ground
Follow every input upstream and cordless drill starts as these 28 raw sources.
Everything it is made of See it on the map
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Sources
Cite this page: "How cordless drills are made." Assembly Line, 2026-11-03. https://assemblyline.org/make/cordless-drill