I'll be fascinated to see if the changewheel set has some really odd gears in it. It's a minimisation problem and the designers may have had a changewheel set in mind which would minimise the number of changewheels required, which may or may not still be with the lathe. I imagine that if it's the same set as you'd get with an ML7 (all multiples of five) it would be very hard to cut common threads..11111111111111 is an unusual thread lead, who would make such a machine?
Do not confuse PITCH and LEAD, they are not the same thing.If you have a scale marked in 1/8th gradulations like a Starrett 4R scale, hold it up to the thread and see if the marks align up with the thread. If it does, it is a 8 pitch thread. I'm with Wreck, who would design a lathe with a 9 pitch lead screw?
Agree, but we have the habit of using them interchangeably together. Let's don't confuse people here over this right now. Wait until someone starts a thread on multiple start threads. I know you had one a while back on some stuff you did. Let's not get off subject here. If you want to resurrect the thread, that's fine but not here. KenDo not confuse PITCH and LEAD, they are not the same thing.