TECHNICAL INFORMATION 160 / NORTON WINTER PRECISION TECHNOLOGY TOOL GRINDING 0.012 Ra [µm] 0.025 0.05 0.1 0.2 0.4 0.8 1.6 3.2 0.100 Rt [µm] 0.200 0.40 1.0 1.6 2.5 6.3 10 20 0.050 Rz [µm] 0.100 0.20 0.6 1.0 1.6 3.8 6 15 Grit Size 181 151 126 107 91 76 64 54 46 30 20 7 GLOSSARY ROUGHNESS The surface roughness of a ground workpiece is influenced by many diverse parameters: • Grit size of abrasive grain • Concentration of abrasive grain • Specification of bond system • Type and hardness of work piece • Grinding process • Grinding parameters • Dressing parameters A general and qualitative correlation between grit size and surface roughness is shown below:
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