by Techgraphix » Tue Dec 19, 2017 1:41 pm
Hi Shawn,
If you have 3 axis, you can use only 3 sensors for the homeposition. In your software you can define the hardware-limits, both positive and negative. Your home position is not the same as the hardware machine limit.
But if one of your axis is build with two separtely driven motors (Tandem-drive for your X or Y-axis) then you need 4 sensors.
For the price of 2-3$ you can always buy one more: Murphy's law says: if you need 3 and buy 3 than one is probably malfunctioning, but if you buy 4, they will be all ok..
Kees