So back to the book, specifically from pages 71 with specific attention to pages 81 and 82. We get 60m travel of the saddle from a single rotation of the threading dial and the lead screw turns 20 times during that travel. well after some manual measurements the following. So looking at the threading dial the gear is 20 teeth, the lead screw is a 3mm pitch and the dial has 4 "lines" or sectors on it. Now this is pretty jolly complete and after reading things several times I felt I had enough of a handle on things to make the next steps. So first off some research into threading on the lathe by reading Workshop Practice Series #3: Screwcutting on the Lathe by Martin Cleeve. I've been looking at the threading dial on my A元20G and thinking it must be usable even though the "manual" that comes with the lathe doesn't tell you anything other than how to set up the change gears.
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