Aug 22, 2018
[caption id="attachment_2242" align="aligncenter" width="300"] stainless steel compression springs[/caption] Compression Spring terms: Active Coils- the coils that deflect when a compression spring is under load. Buckling- the point at which a compression spring bends when a long, slender compression spring is under load. Closed Ends- the point at the end of a compression spring where the end coils touch. Closed and Ground End- same as closed ends except the ends of the compression spring is ground flat. Closed Wound- the state in which a compression spring is coiled with all adjacent coils touching. Deflection- motion of the compression spring when placed under load. Elastic limit- the maximum amount that compression spring wire can be placed under load before the compression spring sets. Endurance limit- the maximum compression spring material can operate indefinitely without failure during minimum stress. Free length- the overall length of a compression spring under no load. Frequency- the lowest rate of vibration for a compression spring while ends are held stationary. Hysteresis- the amount of energy lost in a compression spring during cycling. Mean diameter- the outside diameter of a compression spring minus one wire diameter. Modulus- the coefficient in stiffness of a compression spring. Open ends- the same pitch throughout a compression spring Open ends ground- same as open ends but with ground ends Permanent set- when a compression spring is deflected beyond its elastic limit as does not return to its original position. Pitch- the distance of one wire mean to the adjacent wire mean in a compression spring. Rate- the change in compression spring load between units of measure. Set removal- compressing a compression spring to its solid height to achieve desired length and reduce elastic limit. Set- permanent distortion caused by compressing a compression spring beyond its elastic limit. Slenderness ration- ratio of length to mean diameter in a compression spring. Solid height- the position of a compression spring when compressed, all adjacent coils are touching. Spring Index- the ratio of mean coil diameter to wire diameter in a compression spring. Squareness- the angular difference between a compression spring axis and plane ends. Total coils- the number of active coils plus the inactive compression spring coils.
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