The Y motor moves the Frog plate backwards and forwards as you look at the printer. Was a little tricky as I had there were no pictures showing how to set the belt pulley, but I was able to see how that was done by looking at picture of the fully assembled frame. I need pictures! There is a worded description of how to fit it all together, however it's full of unfamiliar component names at this point, so I just figured it out logically from the picture and good reasoning. The printed belt clamp holders have rough kind of serrated edges on one side and I thought that that was due bad resolution on the printing, but no it was all in the design. The serrated edges are designed that way to grip the belt when tightened down by the bolts.
The second part of this motor assembly is the little black micro stop switch you can see above towards the top middle third of the picture. This will halt the travel of the plate to stop it from hitting the edge when moving back and forth.
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