you need

- - spring;
- - caliper;
- - vices;
- - gloves;
- - safety glasses;
- - Calculator.

Guide

1

Measure the diameter of the spring in a compressed state by using a caliper.Do not use it in this significant effort, otherwise it will shrink, which will distort the measurement result downwards.It is best to measure the diameter in several places, and then find the arithmetic mean of the measurements using the following formula: D = (D1 + D2 + D3 + ... + Dn) / n, where D - mean diameter, mm, D1 ... Dn -measurements in mm, n is the number of measurements (dimensionless).

2

Find
he fact itself that the wire has a non-zero diameter, and each coil, even in the compressed state has a diagonal longitudinal section), but the elongation due to this so small that it can be neglected.

**length**circle one turn with the following formula: l = πD, where l - length in mm circle, π - number "pi», D - diameter of coil (mm) .On theactually has a coil shape is not circle and oval (due to t 3

Count the number of turns of the spring (necessarily completely decompressed state).In order not to make a mistake, you can use when calculating the elastic strip coils, for example, of flexible plastic.Each skipping a revolution in the revolution, it will emit a distinct click.It is enough to count the number of clicks and add them to the unit (from the last round of the strip come off almost silently because they do not hit the next).

4

Multiply the circumference of one coil springs on the number of turns: L = lN, where L - length of the wire from which the suite spring, uh, l - the length of the circumference of one coil, mm, N - number of turns of the spring(dimensionless).

# Tip 2: How to calculate the spring

The notion of calculating a spring hidden a large number of parameters such as the diameter of the rod, the properties of the material and its processing.Therefore, a complete calculation of the spring - a very complex operation performed with the help of special computer programs.The main features include spring, the maximum clamping force (expansion), maximum deformation, the height of the spring in a compressed state and a free pitch and spring.

you need

- dynamometer ruler scales.

Guide

1

Take arbitrary

**spring**and measure with a ruler the length.This will be the height of the spring in a free state.Then squeeze the maximum by acting with some force.Again, measure the length of the spring.This will be the height of the spring in a compressed state.All measurements are made in meters. 2

Count the number of turns of the spring, and then divide this number the height of the spring in the free state.The result is a step spring in a free condition.Do the same for the spring in a compressed state and get the step spring in a compressed state.

3

To find the maximum deformation of the compressed spring, subtract from its height in the free state, the height of the compressed state.This strain is compressive.To find the maximum deformation in tension, attach one end of the spring, it begins to stretch the other end, at the same time using a dynamometer.Indications dynamometer must increase in proportion to the elongation of the spring, as soon as the dynamometer readings began to grow faster than the deformation, stretching should be stopped.Measure the length of the spring and subtract it from the length of the spring in the free state, will get the maximum tensile deformation.Indications dynamometer at the moment will meet the maximum tensile force.

4

To find the maximum force of compression spring load the

**to the point when it is fully compressed.On the scales measure the weight of the load and multiply it by the gravitational acceleration (number 9.81).The mass expressed in kilograms, while the force in Newtons get.** 5

To find the spring, attach one of its ends, and attach the load cell to another, give small deformation of the spring (10-20%).Measure its length in the deformed state in meters, and read the dynamometer in Newton.Subtract the length of the deformed spring length of the spring in a free state.Then, the resulting value of the force measured by the dynamometer k = F / Δx.The results were obtained in Newtons per meter.

Note

If necessary, use protective gloves.Compresses and decompresses the spring is not sharply and smoothly.Protect your eyes.

Helpful Hint

Clutching a strong spring, be careful - it can slip and cause injury.Very strong spring is better measured in the uncompressed or lightly compressed state, despite the fact that the accuracy is somewhat reduced.You need to be especially careful when using a vise to compress or other mechanical devices.