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« on: June 11, 2008, 04:23:34 PM »
Not really sure what you are asking here, are you asking where it is best to set the home position or are you asking which direction is a positive move?
If the former then its just a matter of where you want to put your home switches.
If the latter then its a different story. No matter what type of machine you have you have to think of the tool in relation to the work to see which is the positive direction for each axis. On a mill the lower left of the workpiece is your x and y zero and the top is the z zero, if you move the tool to the right (table left) it is moving positive, for the Y it is the tool away from you (table towards you) and for the Z tool down into the work (Quill down or knee up) is a negative move.
This then follows that the easiest place to set up your home switches is when the tool is lower left corner of your table and furthest away on the Z. That would relate to your table fully right and fully away from you with your knee fully down (or quill up).
As said before you can set the homing switches at any position but if you dont have them as above then you will need to enter home off dimensions into your homing and limits page so that Mach knows the zero position of each axis.
Let me know if this answers your question and if you have any doubts just post again and I will try and explain further.
Hood