Originally Posted by Greolt 
Don't know about your fourth axis. Is it rotary? Then probably only one switch too.
Another thing is depending on how many inputs you have available you can wire multiple switches to one input.
Greg
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I actually only have 3 axis' the fourth is really having a dual X axis drive so I will still need 4 motors and drivers. So I guess I will only need 6 switches to cover all my axis' and if I can use the same switches as home switches, that would be great.
Now, are the home switches only at the end of the machine where you want zero to be? In other words, only using 1 switch per axis for home? Say at the top of Z, the back of X and to the right of Y?