Spring Calculation Basics for High Lift Doors | ABX Sectional Overhead Door

What the Calculation Must Balance

Spring torque must match door weight times the drum radius across the full travel. High lift and vertical lift change the drum geometry, so the calculation is different from standard lift doors.

Inputs You Need

• Door weight and panel type
• Track configuration and lift ratio
• Target cycle life

Why It Matters

Under-specified springs make doors heavy and unsafe. Over-specified springs wear guides and motors. A correct calculation is the cheapest insurance in the whole door.