I saw a post recently about laser scanning using a cheap laser line generator and this got me thinking about using a laser to set X and Y zero on a job.
Got one of these 5mw laser cross generators for less than $5. That was delivered to Australia. Pretty cheap Hey!!!
Made a mount to place it on the Z axis beside the spindle and wired it in to the controller.
I cheated and used the output for mist coolant. M7 on and M9 off.
Because it is only 5mw I power it directly from the BOB. No extra circuitry needed.
Made a button on screen to turn it on. Another button to activate a macro that moves the spindle to take up the exact position the laser was, turns the laser off and zeros the X and Y axis.
Not accurate enough for a milling machine. But very adequate for a wood router.
It works really well. Very quick and easy. And did I mention cheap.
Here's a short video.. Greg
[ame]http://www.youtube.com/watch?v=Oc-9gTFj-y4[/ame]