Similar to this one, but I've had it for at least 8-10 years.
http://www.sears.com/sr/javasr/produ...id=00921336000
I don't use it on a CNC, since I can't find the time to finish mine. Most of the time it's hooked up to my table saw, but I also use it for my planer, jointer, and disc/belt sander. I plan on using it for the CNC when I get it done, and getting a bigger one for my other tools.