Homing

I have completed my 3 axis machine ( 8 X 12 FT! thank you very much) but i am having issues with the z axis homing. i have all the limit switches inplace and properly pinned but when i ask emc to home this axis, the axis does not even come into contact witht he homing switch! i ask it to home it again and the problem becomes exponential. for some reason this axis will not home to the switches provided and yet homes itself to a random dimension that makes no sense. any thoughts?

First: is you home switch polarity correct? This is easily checked with halmeter

Second, if polarity is correct, noise pickup by the limit switch wires (which is likely on so large a machine) might cause random homing behavior
You might need some filtering on the limit switch wires (a small capacitor say .01 uF across the limit switch may do)

Thanks ill check on the wiring, Now im having issues with the software! is there any kind of tutorials for the emc software? besides the users manual.

Have you looked at the Getting Started Guide:
www.linuxcnc.org/content/view/5/5/lang,en/