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How does a cordless impact driver work?

Shop for Cordless Impact Drivers


Screwdriver bit, Anvil, Hammer, Gearbox, Motor, Speed control trigger, Battery pack

1. Battery

Cordless impact driver battery pack Every cordless impact driver is powered by a rechargeable battery.

2. Speed control trigger

Inside a cordless impact drivers speed control trigger The battery’s electrical current is transferred to the motor through the speed control trigger. When you pull the speed control trigger, a switch inside the tool conducts electricity from the rechargeable battery to the motor.

3. The motor

Motor inside a cordless impact driver A motor converts the battery’s electrical current into the rotational energy needed to turn the chuck. This power is a combination of torque and speed, and is measured in watts.

4. Gearbox, hammer and anvil

Gearbox, hammer and anvil inside a cordless impact driver The motor’s power is transferred through the gearbox to a hammer and anvil mechanism.

When a high level of torque is needed to drive in screws, the hammer begins striking the side of the anvil which then delivers a strong rotational force to the screwdriver bit to help drive in the screws.

For a more in depth guide, see our section: How does the impact function work?

Wonkee Donkee says "Think of a cordless impact driver like an electrical circuit. Every time you pull the speed control trigger you are completing the circuit, allowing power to flow through the tool."