Gear set for cutting 10 pitch on a Hardinge TL

To start, I measured the center to center on the two shafts on my Hardinge TL lathe that are used for external gearing. After some math I worked out that the ratio I needed was 25:16, with the big gear on the top. Knowing that I simply made two gears with a totally random pitch that had the right pitch circles to get the ratio right (48mm pitch diameter on the small one). FYI, going to 150 teeth on the big one gets the teeth too small for reliable printing. The set I actually built is 75 too