If I'm reading the chart on the Logan site correctly, for the Model 200 (manual change gears), the two middle columns should be disregarded. The ratio in the right-hand column is what matters. They show a 2.00mm pitch using the 32T stud gear, and a 40T screw gear, which corresponds to the 0.80 ratio listed for that thread pitch.
The math seems to follow.... as you add more teeth to the screw gear, lowering the ratio (of stud/screw), it takes more revs of the headstock to traverse the carriage, so the thread pitch becomes finer.
So I guess the chart that would be most helpful, is one that has calculated the right stud gear, screw gear, and intermediate gear train (if applicable) for each thread pitch.
