How Many Turns do You Wind a Torsion Spring?

Posted December 11th, 2015 at 9:58 am by Dan Musick

Most residential, commercial and industrial sectional garage doors use standard lift tracking and standard torsion hardware.

standard-lift-garage-door-residential

The door rises vertically a short distance and then moves horizontally in the tracks.

standard-lift-garage-door-industrial

These doors use flat cable drums.

standard-lift-cable-drums

On standard lift doors the formula is (DH/DC)+1, or the door height in inches divided by the drum circumference in inches, plus one. After winding the spring you may need to add or subtract a quarter turn or more.

Vertical lift doors are normally found in commercial and industrial applications, such as on loading docks. These doors rise vertically the entire travel of the door.

vertical-lift-door

The cable drums for these are fully tapered.

vertical-lift-cable-drums

The formula for determining the number of turns on these springs is based on door height and drum number.

High lift doors rise vertically – some times a distance as short as a foot or more, sometimes more than half the door height – and then the door rides in the horizontal tracks. When the door is fully open, the lower part of the door hangs vertically in the vertical track extension.

high-lift-garage-door

High lift drums are partially tapered and partially flat.

high-lift-cable-drums

 

The formulas for determining the number of turns to wind the springs is based on the drum number, door height and high lift dimension, which is the distance from the top of the door to the center of the horizontal track.

high-lift-measurement02

As with the vertical lift doors, the formula for the number of turns on the springs is complex. Here, we rely on software or drum charts to calculate the number of turns to wind the springs. If you contact us we can help you with this.

This entry was filed under Technical Support. You can follow any responses to this entry through the RSS 2.0 feed.

Comments are closed.