Hi all, new member here. I'm a maintenance tech in a manufacturing facility, and one of my responsibilities is correctly sizing gearing for production machine format changes. So the vast majority of our machines use either 8 or 10 pitch gears, which makes figuring out the sizing easy. However a few machines contain what are supposedly "1/4" (quarter) pitch gears, which are very close to 12 pitch but not quite. The trouble I'm having here is this: no matter how much digging I do I cannot seem to find any info online about these "1/4 pitch" gears, and the (fairly expensive) gear pitch gauge set I bought doesn't include a leaf for these "1/4 pitch" gears. So what exactly is a 1/4 pitch gear, and why is it named as a fraction instead of the normal pitches (6, 8, 10, 11, etc)?