Have You Considered These Factors?

  • Diameter increases when a spring is compressed. Was this considered when establishing your minimum clearance?
  • Long Compression Springs have a tendency to buckle – especially when their lengths are greater than 4 times their spring diameter. Corrections may require larger diametral clearances and lateral support.
  • Preferred Spring Indexes range from 4 to 12. Springs with higher indexes may tangle and often require individual packaging. Springs with lower indexes are typically more difficult to form.
  • Different stress conditions (such as elastic condition, direct shear load and static loading at elevated temperatures) require different stress correction factors.
  • Under Static Conditions ― To increase the load-carrying ability of springs, increase the length of the spring’s required free length and compress the spring to solid.
  • Stress Relaxation can be affected by material, spring processing variable, time, temperature and stress.
  • In Cyclic Applications, the velocity of end coils is lower than normal. To set the optimum stress level, you need to balance spring cost versus reliability. The basis of your decision will require complete details concerning the spring application’s operating environment, expected life, stress range, the speed of operation, permissible levels of stress relaxation and the frequency of operation.
  • Barrel and Hourglass Springs are calculated as two separate conical springs in a series.
  • When a Variable Diameter Spring is designed so that adjacent coils rub against one another during deflection, its resistance to resonance phenomena will increase, but it may also decrease the spring’s longevity.

Helical Compression Springs

Found in many applications, helical compression springs have the most common spring configuration, which consists of round wire coiled into a straight cylindrical spring.

Wire Selection

  • ROUND WIRE:
    Has the greater capacity to store energy.
    Can further increase energy storage by nesting.
  • SQUARE WIRE:
    Reduce solid height
    Increase design’s space efficiency

Spring Shapes

Helical compression springs are also available in shapes that offer reductions in solid height, buckling and surging or that produce non-linear load-deflection characteristics.

Optional Configurations

  • Conical
  • Barrel
  • Hourglass
  • Cylindrical

Compression springs can be designed with or without variable spacing