Assessment of the effect of stylus tip radius on milled, bored, and honed surfaces

This paper deals with evaluation of the effect of the stylus tip radius on the roughness parameters on milled, bored, and honed surfaces of the crankcase of hermetic compressors manufactured in gray cast iron. Roughness measurements were carried out on machined surfaces of 10 hermetic compressors using a 2-μm and a 5-μm stylus tip radius. For milled and bored surfaces, Rp, Rv, Rz, Rt, Ra, Rq, and RΔq roughness parameters were obtained, whereas for honed surfaces, Rk, Rpk, and Rvk were studied. From the obtained results, it was concluded that for milled and bored surfaces, only the values of RΔq presented statistically significant differences, considering a confidence level of 95%. However, particular attention should be given to the Rv parameter whose p values were higher than 0.05, but very close to it. For honed surfaces, the average values of Rpk and Rk parameters were higher for measurements carried out using a 5-μm stylus tip radius, due to the increase of the peak radius of curvature. No statistically significant difference related to Rpk, Rk, and Rvk parameters was identified.