Currently celebrating their twenty-first year in business, Bridge Abrasives Ltd, based in Totnes, Devon, specialize in the manufacture of metal-bonded diamond and borazon grinding and sharpening tools for the drilling, engineering and woodworking industries. In particular, the company supplies its hand-held air grinderand diamond grinding cups to the quarry drilling sector to re-profile worn tungsten-carbide button bits and down-the-hole [DTH] hammers. According to Bridge Abrasives, the most important factor contributing to premature drill bit failure and poor performance is over-drilling' or operating beyond the reconditioning point. Failure to re-grind in time can prove costly as buttons with 'flats' will cause penetration rates to fall by up to 20%.
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