Tyrolit - Precision Catalog Page 165
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DRESSING AND SHARPENING 163 Interrelationship of surface roughness | grit size The table below will help you select the right grit size to achieve the required surface roughness result. Variable process parameters (e.g. the dressing method) have a significant effect as to which surface roughness can be achieved with a certain grit size. For this reason, the following table also lists the surface areas/grit size. You should take into account that large grit sizes facilitate the removal of chips (material). It is not necessary to select the finest grain for each initial selection of the grit size. Grit size Surface Micro inch CLA μm Ra 42 1.10 32 0.80 26 0.70 21 0.50 16 0.40 14 0.35 11 0.25 8 0.20 7 0.17 6 0.14 5 0.12 4 0.10 3 0.08 2 0.05 36 46 60 80 100 120 150 180 220 Application tips – Ensuring sufficient coolant supply while dressing increases lifetime (to prevent thermal overload of dressing diamonds) – The overlap rate (Ud) defines the number of grinding wheel rotations during which the dressing tool has deployed to its active width – The active width (bd) describes the effective diamond width of the dressing tool for a certain infeed depth when dressing – An increased overlap rate makes the grinding wheel surface smoother and, as a consequence, the actual surface roughness lower – With the overlap rate (Ud), surfaces and stock removal rates can be significantly influenced
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