Once you have hit the calculate button you have created your

If you are a registered buyer with Planetspring.com our

In order to completely understand your spring design you will need to understand the

The rate of your spring is a constant. This constant will let you know how much weight (pounds, ounces, grams, N/mm) is needed to move the spring one inch (1”) or in the case of metric measurements 1mm of distance.

The load of a spring is how much force in weight (pounds, ounces, grams, N/mm) needed to move a spring a particular distance. For example you have a 10” (inch) long spring and a rate of 10lbs/in. You want to know what the load is if you need to travel 3 inches. So you take the rate (10lb/in) and multiply it by the distance you are traveling (3 inches). This will give you a total load of 30lbs.

Formula to determine load is:

Rate x Distance Traveled = Load

Also with a compression spring you will have a preload (L1) and a working load (L2). For example on our spring above our preload (L1) would be 10lbs @ 9 inches loaded height. L2 would be 30lbs at 7 inches height if these are the heights in your design.

The next thing you want to remember when designing your spring is the index. The index of your spring will let you know the stress level of your spring. This value is one of the outputs you will get from our calculator. Once you have calculated your spring take a look at the “spring index”. If the value in that column is lower than a 4 you will have a very high stress spring with small amounts of travel. This will cause the spring to become very fatigued and you will have spring failure. If your index is a 14 or higher your spring will be very wobbly. An example of this would be a slinky. This type of spring can be made but will come at a high cost to you because it is very hard to manufacture. If you would like optimum repeatability and a cost effective spring make sure your spring index is between 6 and 13.

Formula to determine index:

Index = mean diameter / wire size

Mean diameter = Outer Diameter - 1 Wire Diameter

Configuring a