b'Productive TimesWhenitwouldgooverthe part, Mawazeb said, it would be like it was a toothbrush just rubbing over the metal. So it didnt actually remove anything. It actually scuffed up the part more and left a horrible finish.By switching from a four-flute endmill to a five-flute endmill, JR Precision & Welding reduced aver-age burr size but still needed an ef-ficient solution. Bass Tool & Supply recommended an abrasive brush from another toolmaker that the distributor carries: Los Angeles-based Brush Research Manufactur-ing Co. Inc. He wasnt convinced that a different brush would do theBrush Research Manufacturingjob but sent parts to test at BrushA composite hub abrasive nylon wheel brush handles challenging deburring applications.Research Manufacturings surface finishing laboratory. After a test inment grit wears off and exposesfour gas ports so they are not razor which an abrasive disc brush didntnew cutting particles. This actionsharp. Mawazeb said deburring a sufficiently remove burrs, Brush Re- enables a brush to remain sharppart with the brush takes about a search Manufacturing deburred aeven after repeated use. minute. The shop purchased the part with a 152.4 mm-dia. (6"-dia.)After the concept was proven inbrush in August and had yet to re-abrasive nylon wheel brush that hasa lab, JR Precision & Welding pur- place the brush after months of use.filaments made of silicon carbide. chased an 80-grit 76.2 mm-dia. (3"- To remove light burrs, its more ef-It was able to easily get intodia.) brush. The shorter trim fill hasficient to run a secondary operation the slots, push the burrs out andless give and delivers a more ag- using a 4.7625 mm-dia. (0.1875"-remove them, said Elysha Cole,gressive deburring force than thedia.)two-flutechamferingtool, product support specialist at Brushlarger version. In addition to remov- which would break when removing Research Manufacturing. ing midsize and large burrs withoutheavier burrs, he said.The filaments self-sharpen. As aaltering the surface finish, the brushWe eyeball to determine burr brush contacts a work surface, fila- provides a soft edge break to thesize, Mawazeb said.CTEOIL MIST & SMOKE IN YOUR SHOP?www.mistcollectors.comTel: 1-800-645-4174Low-Cost, Highly Efficient Mist and SmokeCollectors Designed Specifically for theMetalworking Industry62APRIL 2020ProTimes.indd 62 3/16/20 5:02 PM'