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INTRODUCTION It is necessary to check that relatively long compression springs are not are
risk of buckling. If buckling is a problem it is necessary to incorporate
some method of guiding the spring by placing it in a hole or on a suitable rod.
Just as a column will buckle when the load becomes too large a long compression spring may buckle when the deflection exceeds a certain value. The critical deflection is given by the following equation. Table showing α for different end conditions
Absolute stability Absolute stability occurs when C'_{2} /λ_{eff}^{2} is greater than unity. The condition for absolute stability is therefore. SurgingFor more detailed notes refer to Surging of Springs The equation for the lowest natural frequency of a compression spring located between two flat plates is.. Forcing frequencies near the above lowest natural frequency and at whole multiples (2,4,6...) of this frequency. 
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Last Updated 17/09/2009