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Example For Calculating Load/Deflection Values For A Buffer
For a buffer type A with a diameter of 30mm and height of 20mm in rubber hardness 57° shore A, and referring to the relevant Spring Characteristics table we can calculate the compression stiffness of the part to be 490.6N divided by 2.4mm, i.e. 204N/mm. Therefore a load of 100N will deflect the buffer by 0.5mm, i.e. 100N divided by 204N/mm.
If the buffer was of type B then the relevant correction factor (CF) should be applied. Therefore the compression stiffness of the buffer will be 204N/mm multiplied by the correction factor of 1.15, i.e. 235N/mm. A load of 100N will then deflect the buffer by 0.4mm, i.e. 100N divided by 235N/mm. Alternatively if a deflection of say 3mm was required then the load required to deflect the buffer can be calculated by multiplying the stiffness of the part 235N/mm by the deflection of 3mm, i.e. 705N.
Buffer Product Code Formulation
The product codes used by GMT to identify standard natural rubber buffers are formulated to be self-explanatory. The following example illustrates how they are derived:
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