Metal Finishing Guide Book


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Page 45 of 843

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. BIAS SISAL BUFFS "Iris" equipment used to gather cloth buffs is adapted to sisal and other materials (Figs. 7-10). Some bias sisal buffs are tapered (wider at the outside than the inside diameter). This reduces gaps between hard sections that could cause 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 operations, 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 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. 42

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