Aristo Federfix 920 Computational Tool for Cylindrical Spring Calculations

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Country of manufacture: Germany,            Date of manufacture: ____
Overall length: 36.8 cm,          Width: 20.3 cm,           Thickness: 0.8 cm           Weight: _____ gms.
Materials: Plastic (PVC)
Cursor: Swingarm type, hinged at upper right; approx. 38 X 13 cm. Two different swingarm cursors supplied, for different values of a correction factor k used in various formulae.
Scales: specialized
Front:
     main body: f, f′, n_e, n'_e
     left-hand slide: G, D_m, l, l', d, Gew', P
     middle slide slide: formulae for use and definition of variables, c', c
     right-hand slide: i_f, G
     swingarm with k = 1: curves τ_i, l, D_m+d, D_m-d, baseline
     swingarm with k = 1 according to DIN 2089: curves for τ_k, l, D_m+d, D_m-d, circle scale k, baseline
     slider located between the middle and right-hand slides: connects the scales c, c', and I_f
Back of frame and back of all slides: blank
Gauge Marks: [      ]
Condition: C3 (Very minimal signs of use)
Came with: Instruction booklet (German), hinged case, 2 swingarm cursors

 

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