Tools

Torsion Spring Winding and IPPT Estimator

A free educational tool for torsion spring winding turns and illustrative IPPT. Not a DIY guide.

Safety note: torsion springs store dangerous energy. The figures here are illustrative, not a winding guide. Have a trained technician size and wind springs.

Torsion spring winding and IPPT estimator

Safety first. Torsion springs store dangerous energy and can cause serious injury. These figures are illustrative only, not a winding procedure or a spring-sizing spec. Have a trained technician measure, size, and wind springs.

Winding turns

6.7turns

27 quarter-turnsillustrative IPPT ~ 60

Use this to read a spec, not to size or wind a spring.

Illustrative figures only. Springs store dangerous energy; sizing and winding is a job for a trained technician.

In plain terms

A torsion spring is a wound-up energy store. The taller the door, the more the spring has to turn to lift it, and the heavier the door, the more force each turn has to hold. IPPT, inch-pounds per turn, is just how much lifting force the spring adds with each turn you wind into it.

Rule of thumb: winding turns are roughly the door height in inches divided by the drum circumference. A 7 foot door on a standard 4 inch drum needs about 7 turns. This is for understanding only, not a winding procedure.

What each part means

Term	Plain meaning
Turns	How far the spring is wound to lift the door
Drum diameter	Bigger drum lifts more per turn, so fewer turns
IPPT	Lifting force the spring adds per turn

A worked example

Worked example (illustrative). A 7 foot door (84 inches) on a 4 inch drum needs about 84 divided by 12.6, near 6.7 turns. A 200 pound door gives a torque near 200 x 2 = 400 inch-pounds, so about 60 IPPT. These figures explain the spec; they are not a sizing or winding instruction.