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This Helical Compression Spring Design Equation will determine force from the given variables.
Force (F) = k(D_{Standing } D_{Deflected})
Where:
F = Force exerted on spring (lbs)
D_{Standing }= Free length of spring (inches)
D_{Deflected}= Length of spring with force applied (inches)
k = Spring constant determined by experiment or calculation (Calculate
k Constant)
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Open > Helical Compression Spring Design Calculator
Compression Spring Design Suggestions:
Spring rate can be measured by taking the difference in force at 80% maximum deflection and 20% minimum deflection and dividing by the difference in deflection. The spring rate tends to be constant over the central 60 percent of the deflection range. Because of endcoil effects, the first 20% of deflection range has a considerably lower spring rate. The final 20% of deflection shows considerably higher spring rate. When designing for a particular spring, design for critical loads and rates to be within the central 60% deflection range. Standard and custom springs are
available.
