Each feature should be dimensioned once and only once. Dimensions should be placed in most descriptive view. Dimensions should specify only size, manufacturing method only if mandatory. Dimensions should be located outside object boundaries. Dimension lines should be aligned and grouped when possible
Springs are connected end-to-end in series. Total extension equals sum of individual spring extensions. Total force equals sum of individual spring forces. Total spring constant decreases, reducing system stiffness
Cylindrical helical springs offer linear force-displacement relationship and simple design. Rectangular section springs provide higher stiffness and better space utilization. Flat section springs excel in space-constrained applications. Unequal pitch springs exhibit progressive stiffness with coil binding
Compression springs store energy when compressed and oppose axis compaction. Spring dimensions, load and materials determine deflection. Thicker coils require heavier loads to start compression