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First practice on some scrap bar and a cutter ground by eye Necessary before I spend money on taps. I need to set up a carraige stop to make it easier to pick up the start point for every cut, and obviously grind a tool correctly.I am not entirely convinced that I am dealing with an acme thread Looking at an unworn end the thread flanks look parallel..a square thread? Surely an acme won't wear that way. Unfortunately I do not possess a good enough camera to show it. Would a square thread have been used? More advice needed,