Evaluation of Surface Flatness and Roughness for Marble Products Produced with CNC Machining

Industrial parts quality manufactured with CNC machining is related to the cutting parameters, the material of the part, and the part geometry. Different materials behave differently according to the machining process. The widespread use of marble products for different applications for granite surface tables for CMMs, calibration reference gauges, and in-home furniture has led to revising the quality of these products produced from CNC machining processes. Four marble cubes 600 × 600 mm are produced with CNC milling with different parameters and will serve as specimens. Geometric tolerances define the deviation of different geometric elements more sophisticatedly than dimensional tolerances. This paper presents two methods for the evaluation of surface flatness and roughness by a limited number of measured points in manual and automated measurement methods with GD&T by 3D scanning technique. The results obtained indicate that surface roughness affects surface flatness measurements, by identifying the problem, and can help to find a relationship between the manufacturing process parameters and the quality of the parts.