wrong size spring by adjusting the number of winding turns. If you do not know a proper spring size, then you or your spring supplier must calculate a proper size (see below) based on an accurate weight (within 5 pounds) of the door. So you must then in turn have an accurate weight...
Similarly, for the spring ratio, the component of velocity in the direction of the spring was taken into account. Additionally, to incorporate the effect of spring preload forces, the preload (𝐹𝑆𝑃FSP) was multiplied by the spring’s kinematic ratio gradient, as outlined in [17]. The...