Black Zinc Plating Piano Wire Springs 0.05-20.0mm Double Hook Extension

1. How do you measure garage door Extension springs?
For a one car garage door, carefully lower the garage door onto a bathroom scale in the center of the garage door. Read the scale. The weight that shows on the bathroom scale is the size extension spring you need to order. For a two car garage door, carefully lower the garage door on to two bathroom scales

2. How far should garage extension springs stretch?
Length. Since extension springs have to stretch during the loading phase and contract to help the door raise, length plays a major role in door operation. Extension springs for a 7ft tall garage door are a standard 25 inches and stretch 42 inches. Springs for an 8ft tall door are usually 28 inches and stretch 48 inches ..

3. How does tension affect a spring?
A spring under tension for an extended period of time can become weaker. Any object will either resist or deform when subjected to outside stress. Springs are specifically designed to deform in order to absorb energy from outside stress, then return to their natural state when they release that energy.

4. What is a tension spring on a sewing machine?
In most sewing machines, this resistance is controlled by a spring and two or three plates – called the tension plates. The thread goes in between these plates, and the spring pushes the plates together.

5. What is the key difference between tension and spring force?
The tension force is directed along the length of the wire and pulls equally on the objects on the opposite ends of the wire. The spring force is the force exerted by a compressed or stretched spring upon any object that is attached to it.