The only mechanical noise during exposure is from the shutter leaves opening and closing.

Her head reared up and she made a mechanical barking noise toward the ceiling.

A mechanical noise announced the opening of the door.

Just then, a loud mechanical noise echoed out from the other side of the dividing wall.

A sudden mechanical grinding noise caused him to spin around.

Fans overhead kept the air circulating, but otherwise there was no mechanical noise.

The new design also reduces internal mechanical noise because of its increased efficiency.

Flattening himself against the smooth wall, he strained to hear something above the mechanical noises.

Most people would not have heard the sound amid all the other mechanical noises.

Because of his artificial body, he makes mechanical noises when he moves.