very interesting, I don't think I quite get it but very creative. I used to have a laser center finder mounting next to my router and had a button with a vb script offset. So I would line up my x axis zero out then my y zero out and then hit the button and it would offset to the center of my router. But I realized after doing a test cut that I had to move the router mounts a little to make sure the router bit was square to the table. This made the laser slightly skewed making it line up at different points depending on the height of the z axis. Plus I found out that router collets are not that accurate. Mine has .003 run out. So now I just chuck up the laser, which it was made for, and find the general edge rotate the chuck until the runout is equodistant to the edge I'm finding. Works very well for now. I have a pretty good eye, and I now the Laser Center Finder manuf. says it's .001 accurate it does take a lot of eye squinting to make sure you're actually there, whick is frustrating. Like on my bridgeport manual mill I use an electronic edge finder, when it just touches the edge it lights up, a much more positive action than squinting at a little itty bitty laser. I always double check the electronic edge finder by backing off and redoing it and it's very accurate. Since I'm using wood on the CNC I can't use it becasue it's based on touching metal....actually I just thought I get it now your device does the same thing but using motion instead of completeing a circuit to find the edge...i like that.