Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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Page 40 of 707

Fig. 4. Bias buff (left) versus conventional buff (right). Thread configurations of bias buffs alternate warp and filler threads. Biasing provides design efficiency by exposing all thread ends to the surface being buffed, reducing fraying of the fabric. streaking. The tapered bias sisal buff is a long-life, cool-running buff for steel and stainless steel. Hard bias sisal buffs also are used in place of some belting oper- ations, as well as in deburring and brushing. Open-Cloth Bias Sisal Buff The open cloth bias sisal (OCBS) buff is used on contoured steel and stainless steel parts (Fig. 9). It consists of woven sisal and cloth, four plies of each (eight plies total), bound together by concentric sewing before Iris gathering. The buff is manufactured in endless strips, cut to length, rolled around split drums, and gathered into clinch rings by the "Iris" machine. A variation of the open-cloth bias sisal buff is the open double-cloth bias sisal (ODCBS) buff. This design consists of two layers of cloth sewn together with one layer of sisal to make a 12-ply buff of eight plies of cloth and four plies of sisal. Spoke Unit, or Finger Buff Spoke unit or finger-type buffs combine great cutting power with the capacity to flex and accommodate contours and allow better workpiece coverage with fewer buff- ing heads. Spokeunit or finger-type buffs are made from materials that include soft cloth, stiff cloth, sisal, and coated abra- sives. The material is manufactured into units, or fingers, sewn into endless belts, cut to length, wrapped around split drums, and gathered by an "Iris" machine into steel teeth. The spoke unit or finger Fig. 5. Steel clinch ring (left) and steel clinch ring buff with open center (right). Buffs that are constructed by the clinch ring or "Iris" machine method have superior ventilation and cloth biasing, and optimal material utilization. 39

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