Hi, My name is Alan, retired, from Sydney, Australia, I have just finished assembling a Sieg Super X3 with CNC conversion running on Mach3, I found the X3 a bit short on quality, the reclaimed steel made drilling difficult, some holes did not line up with Sieg CNC conversion centres. I fitted optical limit switches on the Z axis and magnetic reed switches on X and Y axes. I also made a USB hand controller using a Logitech keyboard PCB and wiring the key functions with wirewrap wire to the pushbuttons. Also fitted a coolant pump solid state switch controlled by the software. I used a PCI dual parallel port card instead the motherboard port to connect to the mill so that any user failure would protect the PC. Previously I had let 12 volts get to one pin of the parallel port on the motherboard, this motherboard is now crippled. Alan