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Thanks for the prompt reply Si. so if the micro switch is closed the MACH3 triggers Z Home?I am from India can you suggest some good breakout boards i mean the company who makes them. And would like to know which company makes the board you have illustrated here(KK-01). cause CNC4you takes me to Siemens website and i am not able to find any BOB there. And also pl suggest some good THC as the sheets we get here are or will never be completely flat. thanks sidharth.