John,
This was what I was on about before, only keeping within a percentage tolerance.
My Atlas lathe was a great example. Because of the large quantity of change gears and combinations you could put onto the quadrant, very tight ratios could be produced, and with a little mechanical calculation, you could get it to cut almost any metric or imperial thread, so they would match up with a third party thread very accurately.
Because this machine we have has so few quadrant setups and change gears, even though there is a large combination of internal headstock gearing, you just won't be able to get the very finer tolerances.
Basically we are stuck with what the machine will allow.
It all looks great on the advertising literature, but not too good when it comes to the physical side. What they should do is tell you what the thread tolerances are as well.
So it won't take more than half an hour for you to check every thread combination shown on the charts, so I will look forwards to seeing the actual thread sizes generated. It will save me hours doing it manually.

What a nice man, dropped himself right in it there.

But joking aside and in all honesty, great job.

Bogs