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# spreadsheet for cam/roller Hertzian contact stress with double curvatures

## spreadsheet for cam/roller Hertzian contact stress with double curvatures

(OP)
hello, I am trying to write an excel spreadsheet for calculation of Hertzian max contact stress btw cam (body#1) and roller (body#2).The cam has a flat lobe (no transversal curvature)but the roller has a "crown" defined by a radius of curvature.The input data are cam geometry defined by the raius of curvature and loads (both expressed by angular value with resolution = 1 deg). Then I have applied the formulas to calculate the semi-minor & semi-major axis of contact and ultimately the max Hertzian contact pressure which is the final goal and the entire focus. The result I am getting doesn't look promising (values smell much too low) so there is likely to be some error but I was not able to find it. One possible reason could be the definition of radius of curvatures but I think they are all positive (+) since they are all positioned within the direction of their respective bodies. The coefficients μ(θ)and ν(θ)
are obtained by extrapolation of exponential model and should be OK.

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