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28th June 2018, 05:20 PM #1Most Valued Member
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Model C Gearing for Metric Screwcutting
I am a self-taught novice on my late father's Model C. I am looking to turn a 1.25mm pitch thread for a carburetor jet in a veteran car. Two questions:
1. the chart on the lathe gear cover specifies a 27 stud gear but the Hercus book (p61 of the 1980 ed) specifies a stud gear of 24. Which is correct? To confuse matters further the book specifies a gear number for 1.0mm pitch which has been crossed out and 27 has been handwritten there (by my father I assume).
2. a 63/60 compound gear is specified - does the 63 run closest to the lathe or the 60? I'm finding it a bit hard to work out the diagrams!
Jeff
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