Helical Spring Design Guide.xls
Outline Calculation Procedure
1) Purpose of calculation
The design of a helical spring using mechanical design formula and material lookup tables.
Check dimensional limits, strength limits and buckling limits against the operational requirements.
2) Calculation Reference
3) Calculation Validation
Formulas checked using the XLC add-in
4) Calculation Units
6) Main Input Parameters
Spring mean diameter
Number of turns
% length on installation and operational max compression
7) Spring Ends
Number of inactive turns due to closed and ground ends
Effective number of turns
8) Material Properties
Ultimate Tensile Stress
Torsional yield to tensile ultimate strength factor
Torsional yield stress
Conversion Factor from Mpa to selected system of units
Torsional yield stress converted to select system of units
Modulus of rigidity assuming a Poisson's ratio of 0.3
9) Spring Deflection Characteristics
Force to close the spring
10) Spring Strength Characteristics
Torsional Stress Rate
Force to yield spring
Spring extension to yield spring
11) Spring Buckling
Buckling critical compression length
12) Operational Limits
Maximum working load
Elements of Mechanical Design
Design of Springs
25 Nov 2011
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