
Garage Door Cable Drum Physics: How the Spiral Does the Work
A cable drum on a residential garage door is a grooved cylinder that converts torsion spring torque into the linear lift of a 200-pound door.

A cable drum on a residential garage door is a grooved cylinder that converts torsion spring torque into the linear lift of a 200-pound door.

The door won’t close. The opener light is blinking. You’ve pressed the button twice and nothing has changed. Before you call anyone, look down at

A full garage door installation, door plus opener, professionally installed, runs $1,950–$3,900 in 2026 for a standard 16×7 double-car opening with a mid-grade insulated steel

You have a working door and a dead opener, or an opener that has started making the kind of sounds that end conversations. Either way,
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