I'm on the last leg of putting my plasma table together with Mr Campbells THC300 and need some final hook-up advice, whoopeee. I have two switches on th X-axis, two on the Y-axis and a switch on the Z-axis for a floating THC and the Z-axis home switch making six switches alltogether and a total of 11 possible input signals! Thats 3++, 3--, 3 home, 1 THC and an Estop signal. What I don't seem to have are enough input pins on the cnc4pc breakout board. After reading Bob Campbells setup manual, and Sheetcams THC setup manual and Mach2s manual I almost get a grip. From what I understand Z++ Limit and "Digitize" are assigned input pin 13 on port 1 in Mach2, that leaves 4 input pins. Mach2 then assigns Estop to pin 10 mandatory for instance leaving only three pins for XYZ Home and XY-- and XY++ limit switches. Can I assign X-- and Y-- as limit switches in series or parallel to pin 10 not having an actual Estop switch and XYZ Home and XY++ to the same pins or how did you do this? If anyone understands this mess please let me know.
Been awhile sence I hooked up the switches.. but I'll give it a try... Your x+ and x- can be hooked up in series and then ran to one input pin... the same with your Y+ and y- .. Then inside Mach there is a place to select if you home in the + or - direction. Mach will always then move in that direction to home and trip the switch in that direction. If Mach hits a switch any other time it considers it a limit switch and will trip the reset button. Also its a good idea to wire all your switches Normally closed. That way if a wire should happen to break it will cause the reset to trip in Mach. If it was wired Normaly Open. you could have a wire break and you would not know it and your limit/home switch would not work.
One more thing. Bob Campbell uses the digitize. that is a G31.1 I think.. while the post processor from sheet cam uses the Home switch G28.1 If you are using Sheetcam then hook it up for the G28.1 (homeswitch) and forget about the digitize.
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