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For Mach3/LinuxCNC it just triggers the depth probe input. Usually that's a input line that makes connection to the grounded spindle/frame, but the switch grounds the input line directly. Don't know the math, but perhaps Scorchworks can help you with that as they took it from another project.
Delta, as in subtracting the probe position from your bit position. For my case above, from the probe to the spindle is +3.83" in the X direction, and -2.28" in the Y direction. For my router pictured above, +X is moving to the right, +Y is moving away from the camera, with the spindle closer (-Y) and to the right (+X) of the probe. (For GCR, I had to figure this out the hard way.)
Thanks! It was just a test to show how temperamental Vcarves can be. (Free flooring samples from HomeDepot are addictive. )We did a batch for Xmas 2013 that turned out far better - https://imgur.com/a/RtdOHThe plan for this year is to make 12" clock faces, so the chance of ruining a chunk of maple is far higher. Hopefully Ripper will take the guess-work out of the equation.
DIY CNC Z Probe for Use With G-Code RipperView Instructable »
PIR Motion Detector With Arduino: Operated at Lowest Power Consumption Mode