To answer some of the questions on the last two posts. I am cutting a SIP (structural insulated panel), it is a sandwich of 2 sheets of OSB and styrofoam in the middle. The parts are 8' x 24', and vary from 4.5" thick to 12.25" thick. The panels are vertical, and they move in the X, where the saw moves in the Y,Z, Beta, and tilt. This particular switch is fed off a powered coveyor into the saw. This trips the sensor. The X axis then clamps onto the part (now I have stepper precision) and backs the part up until this switch is clear. This will be my zero position.
I tried the retro-reflective sensors, but the skin of the part varies too much. I was having the same signaling problem on the Campbell board with a banner 312 photo sensor using through beam fiber optics. For using a mechanical limit switch, until the part is clamped, there is no guarantee that the part will be close enough to the switch to trigger it.
Ideally I can get this switch to work. If it is just too sensitive for the Campbell, I will probably hard wire this switch to the PLC, and code in that as soon as that input is latched, fire an output hooked to the Campbell. That way I maintain the speed, but can use the PLC to filter the signal.
Hope this helps explain my problem some.