They really don't cut threads, more or less form them on the outside of any size rod within the range of the tool. Each set of dies fits a range of rod sizes, with thread pitch becoming smaller with each smaller die set. There used to be a matching slightly tapered set of taps to make inside threads to match. With them a nut could be made to fit whatever thread was formed by running the tap in to a depth, or diameter to suit. My grandfather was a part time blacksmith and he had a complete set of them. I think one of my cousins ended up with them. Paul
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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