Roughness sample sets (for visual comparison only) ALPA

• 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