One important thing to note with hooked springs is that the highest stress is at the ends of the spring.
TORSION SPRING CALCULATOR SERIES
Adding extension springs in series will enable more travel, while adding them in parallel allows for more force. The spring rate is constant once preload is overcome (more to come on that). The OD and ID of the spring is consistent for the length of the spring coils they are generally intended to be hooked on each end.
The most popular are:Ĭylinderical springs are very common and come in a variety of sizes as an off the shelf part. It’s all backward! 1.Ĭylindrical extension springs with hooks on the end are by far the most common type available, but there are other shapes to consider. I liken this to tightening a hex head screw with a socket wrench and tightening a socket head screw with a hex wrench. A compression or extension spring is loaded in torsion and a torsion spring is loaded in bending. One of the most fascinating things about springs is that the method they are used in is opposite of the load they see. On the other hand, if your trampoline is missing too may springs, you are falling through to the ground. To illustrate this, if a spring in your cars suspension fails, your car will still be in one piece and you could at least make it to the side of the road before too much damage was done. If an extension spring fails, the components will be separated from each other and the result could be disastrous. When a compression spring fails, the pieces are still in a bore or around a shaft and the components remain in contact with each other. All springs work well in their linear range, but as soon as they are loaded past the yield strength, the spring stops behaving as intended and the spring life is severely shortened.įurthermore, the consequences with an extension spring are much higher. One crucial thing to understand when designing extension springs is to be sure to operate them in their intended range. When designing or selecting a extension spring the following items need to be considered: If more force is applied, it will deflect When force is applied to an object, it will deflect. Acts like a spring, which follow Hooke’s law.