This set consists of 30 samples of metal surfaces produced by 6 different machining methods widely used in industry.
The label shows the Ra values of each sample according to both the metric and imperial system.
(Label for Rz available on request).
Nominal values of samples - Ra µm 0.05 - 0.1 - 0.2 for lapping and boring - Ra µm 0.4 - 0.8 - 1.6 for grinding - Ra µm 0.4 - 0.8 - 1.6 - 3.2 - 6.3 - 12.5 for horizontal and vertical milling, turning