PFERD Tools Main Catalogue Page 284
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Fine grinding and polishing tools General information A distinction is made between the following roughness depths: ■ Individual roughness depth Rzi The sum of the height of the largest profile peak and the depth of the largest profile trough within an individual measuring section. ■ Roughness depth Rz The mean value of the individual roughness depths (Rzi) of consecutive individual measuring sections. ■ Roughness depth Rmax The largest individual roughness depth within the overall measuring section. ■ Average roughness value Ra The arithmetic average of the amounts of all values of the roughness profile. RZ 1 RZ 2 ① RZ 3 RZ 4 RZ 5 ② R Application Coarse grinding: grit sizes 24 to 150 Fine grinding: grit sizes 180 to 400 Very fine grinding: grit sizes 500 to 1,200 Structuring: surfaces ground Satin finishing/matt finishing: with non-woven abrasive Polishing: Step 1: Step 2: Step 3: Roughness depth Ra = 0.70 to 12 µm Ra = 0.20 to 0.70 µm Ra = 0.05 to 0.20 µm Ra = 0.20 to 0.70 µm Ra = 0.10 to 0.70 µm Ra = 0.10 to 0.20 µm Ra = 0.04 to 0.10 µm Ra = < 0.01 µm Reference values for roughness depths in the case of different applications. ② 4 ① Individual measuring section ② Overall measuring section 10.00 µm 9.50 µm Stainless steel (INOX) 9.00 µm 8.50 µm Steel, non-hardened/non-heat-treated 8.00 µm 7.50 µm Soft non-ferrous metals Roughness Ra [µm] 7.00 µm 6.50 µm 6.00 µm 5.50 µm 5.00 µm 4.50 µm 4.00 µm 3.50 µm 3.00 µm 2.50 µm 2.00 µm 1.50 µm 1.00 µm 0.50 µm Grit size Surface roughness of different materials after machining with tools using coated abrasives. 6|4 Catalogue A 1200 A 1000 A 800 A 600 A 500 A 400 A 320 A 240 A 180 A 150 A 120 A 80 A60 A 40 0.00 µm
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