Каталог Dormer Pramet фрезерование 2021 - 2022 - страница 291

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9 ROTARY BURRS – GENERAL HINTS Recommendations • Always use the appropriate speed rated die grinder. • Routine maintenance of die grinders is important, ensure they are oiled and bearings are not worn. • Always clean the clamping nut, collet and internal taper of the die grinder when changing a burr. • Try to avoid mechanical shock and heavy impact of the burrs. • Try to avoid thermal shock by not allowing the burr to become overheated. • Don’t plunge the burr too deep into the workpiece material or jam the bur into corners or channels. Trouble shooting using burrs Problem Cause Running speed too low (revolutions per minute) can cause bouncing (chatter). Chipping of Burr Teeth Eccentricity (worn spindle, collet or bearings). Plunging and jamming the burr into the workpiece. Flute length or overall length too long. Clogging of Burr Teeth Incorrect geometry choice for workpiece material. Running speed too high (revolutions per minute) for size of burr and workpiece material. Premature Wear Eccentricity (worn spindle, collet or bearings). Running speed too high (revolutions per minute) causing overheating. Head Detaches from Shank Running for prolonged periods causing overheating. 290