How do you calculate spring rate?

To calculate the amount of spring rate you will need on order to meet your working loads, simply divide the load you will be applying on your spring by the distance you expect your spring to travel or compress under that load. The equivalent to that formula will be your compression spring rate as shown below.

How do you find the spring length of a solid?

The solid length of a spring occurs when all the coils are touching. If the spring is squared and ground, then there will be two inactive coils. L s = d ( N + 2 ) = 0.0016 ( 8.91 + 2 ) = 0.0175 m .

What should my spring rate be?

Springs should typically be compressed 25-30% of the free length when supporting the weight of the vehicle. Drag race cars will normally use a lighter rate spring (about 30%) to promote weight transfer while a street car will use a firmer rate spring (about 25%).

Does the spring constant have a unit?

The defining character of a spring is that it resists displacement from its rest position with a force which increases linearly: restoring force = – k * (displacement) where k is called the spring constant. It has units of Newtons per meter.

How do you find the height of a spring?

For an unground spring, the solid height, h1, is (n+1)d, where n is the number of coils and d is the wire diameter (including platings and coating) in inches. For springs that are ground but not squared, the height, h2, is (n-1)d. Springs that are ground and squared, the solid height, h3, is (n-0.75)d.

What is solid height of a spring?

Solid height is the term that refers to the length/height of the spring once it has been compressed to the point where all of the spring’s coils are touching. Solid height is an important factor when it comes to spring design and function.

How do you find the spring constant k?

The formula to calculate the spring constant is as follows: k= -F/x, where k is the spring constant. F is the force and x is the change in spring’s length. The negative sign indicates that work is done against the restoring force.

What is a normal spring constant?

We have revealed that the spring constants of the nine CNCs, derived from the formula k = k’ δ’/δ, ranged from 0.9 N/m at the minimum to 4.8 N/m at the maximum. The average value for the nine CNCs was 1.8 N/m [15], which agrees with results previously reported [13].

Is higher or lower spring rate better?

As you decrease the spring rate, the suspension is able to conform better to road irregularities, and thus grip improves. You might think the higher spring rate would react faster, but in reality, the lower spring rate will contact the ground first, and thus allows for more grip.

What do you need to know about spring rate?

Spring Rate Calculator. Definition: Spring rate, also known as spring constant, is the constant amount of force or spring rate of force it takes an extension or compression spring to travel an inch of distance or, in the metric system of measurement, a millimeter of distance.

What does spring rate and static load mean?

Static Load = Sprung Weight / Motion Ratio. The static load is the load that the spring sees from the sprung weight acting through the motion ratio. Spring Rate = Static Load / Shock Ride Height.

What is sprung weight in spring rate calculator?

Sprung weight = Corner weight – Unsprung weight. It is the weight supported by the spring and is the only weight used in calculating spring rates. The “motion ratio” is the mechanical advantage (lever ratio) that the wheel has over the spring in compressing it.

How do you Know Your compression spring rate?

To know your compression spring rate divide the load of 5 pounds by the distance traveled of 0.2”. The result shall be 25 pounds of force per inch of travel. Example 2.) You have a compression spring with a free length of 5” and it is supposed to travel or compress 2” under a load of 20 pounds.

How to calculate the spring rate of an A-arm?

The 230 lbs. represents the spring rate needed when mounted at a 30° angle to equal the desired spring rate of 200 lbs. when standing straight up. Select your spring rate by using the following calculations: D1 = The distance from the pivot point of the a-arm to the mounting point of the spring/shock.

When to use spring rate calculator for coil over?

Below are approximate spring rates for your coil-over application. This calculator will only give approximations depending on the accuracy of your information. Use at your own discretion. Recommended spring rate to optimize ride quality. Is best used for crusing, day to day use, and long distance driving.