Sharpening Gear Cutters with a Worden Grinder

摘要

Over the years I've made a few gears in my workshop using home-made Brown & Sharp type milling cutters in silver steel, made according to the instructions provided by Ivan Law in 'Gears and Gear Cutting' and using my Eureka backing off device. I've always been very careful to run these gear cutters at a slow speed so that there is no risk of overheating the cutter and spoiling its temper. However, I recently treated myself to a set of High Speed Steel cutters from Hong Kong. These have turned out to be of good quality. I was using one of the cutters to mill a helical gear when halfway through the first gear it stopped cutting.