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Yes, you must temper after hardening and before grinding. I temper reamers only to light straw colour, still hard enough to cut but some of the brittleness avoided. Care must be taken to avoid...

Making a D reamer is a piece of cake. Start with a piece of 10 or 12mm silver steel and a good accurate drawing. Face and centre drill the rod then extend it from the chuck about 75mm to give you...