PFERD Tools Main Catalogue Page 265
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Fine grinding and polishing tools General information Custom-made products If you cannot find the solution for your particular application in our extensive catalogue range, we can produce fine grinding and polishing tools in premium PFERD quality specifically for your application on request. We can take into account your specifications and needs, drawings, information on dimensions and shapes, grit sizes and grain types, grain mixtures, shank diameters and shank lengths. Please speak to our sales representatives. We will be happy to advise you. Factors that influence the surface roughness: The abrasive material, the material you will be working on and the machining parameters all affect the surface roughness. As a general rule: ■ The larger the grain, the rougher the sur■ Reducing the feed rate produces a slightly face produced. finer surface quality. ■ The softer the material that is being machined, the coarser the surface produced when using the same grit size. ■ The increase in cutting speed leads to a slightly better surface quality. 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 ① RZ 2 RZ 3 RZ 4 RZ 5 ② Ra ② ① Individual measuring section ② Overall measuring section 4 Application Roughness depth Coarse grinding: grit sizes 24 to 150 Ra = 0.70 to 12 µm Fine grinding: grit sizes 180 to 400 Ra = 0.20 to 0.70 µm Very fine grinding: grit sizes 500 to 1200 Ra = 0.05 to 0.20 µm Structuring: surfaces ground Ra = 0.20 to 0.70 µm Satin finishing/ matt finishing: with non-woven abrasive Polishing: Step 1: Step 2: Step 3: 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. Catalogue Page 4 5
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