Dear Neil, I was so impressed by Brian Wood's Screwcutting article in issues 212-3 that I immediately on reading it set about modifying my Myford Super7B to his spec and proving its value on a small project. So easy to achieve any pitch merely by changing the mandrel gear and selecting the right gearbox setting - no more stripping down the gear train, sorting out correct combination and re-assembling with desirable gear-tooth clearances. There followed three years of using only taps and dies until, the other day arose the need to cut a thread of 22.25 mm major diameter and 1.00 mm pitch to match the body of an existing pressure regulating valve. This was done in minutes including adjustment of depth of cut until a smooth close hand fit was made to the body. Very pleasing.
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