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Lathe cutting wrong thread pitch

Tennessee Tater

Plastic
Joined
May 10, 2016
I have a 70's vintage SB 13, just learning to run it. Today I attempted to cut a 16 tpi on a piece of 3/4" cold rolled bar stock. The thread looks good, but it cut 12tpi.
It has a double tumbler gearbox, & on the plate on it calls for the left tumbler to be in "b", with the right tumbler to be in the first (far left) position. I tried running on the bull great but the threads were really fine.
Any help greatly appreciated.
 
Got it figured out, running metric transposing idler & 32t stud gear. Another forum member is sending me a 24t stud gear. This is a great forum with helpful members, I have no doubt they can work through any problem. My hats off to all of you, many thanks.
Dan
 
Treat that metric transposing gear like gold. They are rare and expensive for a SB 13. Start collecting the other gears for a full metric set; you'll need them eventually.

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