Surface Texture and Inspection

The surface finish achieved by a machining process determines how well a surface performs its given function. Surface inspection compares the specified nominal surface and real surface to find the measured surface. Measurement can be completed by comparison, direct measurement with a stylus-type instrument, or noncontact methods. A real surface contains irregularities (flaws, roughness, waviness, and lay) that make up its surface texture. Roughness is the most common irregularity used to inspect surfaces. The desired finish of a surface changes how precisely a part must be machined. Inspecting for surface roughness reduces the cost of surface finish by allowing companies to produce parts to customer specifications. After the class, users should be able to describe commonly used methods for tolerancing a part's surface roughness in a production environment.