Workpiece surface measurement, for roughness and microscopic profiles, has an assembly of feeler needles riding over the surface and a needle riding against a reference plane surface

摘要

The assembly (20) to measure microscopic surface profiles or roughness values on a workpiece (50) has a feeler unit (36) with a feeler lever (23) fitted with needles (28,34) moved by a drive (21) with their tips (45) riding on the workpiece surface. A metal reference plane (22) lies over the feeler or its slide (35) with a wear-resistant coating. As the feeler is moved over the workpiece, a further needle (29) rides on the reference plane surface (78).