The results of experimental investigations of surface quality after the lathe machining of polymeric materials subjected to preliminary treatment with surface-active substances are presented. It has been demonstrated in experiments that the preliminary treatment of semiproducts with surfactants ensures an improvement in quality of the surface machined by turning. This is indicated by a reduction in the roughness parameters by a factor of 2–4.5, and here the minimum roughness is achieved at a depth of cut equal to 1.0–1.15 of the depth of penetration of the surfactant into the material.
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