3552
« on: December 26, 2013, 05:28:22 AM »
You need to set the X Y and Z motion to be the correct direction first. Which way that will be depends on the type of machine you have but one thing is constant and that is the relation of tool to work.
For example if you have a knee type mill the table moving left will be a positive move in X as the cutter would be moving positive in relation to the work piece.
On something like a gantry router then the gantry moving right would be a positive move as again the cutter is moving positive in relation to the work material.
Once you have X Y and Z set correctly for direction then you can tell Mach the direction you wish to home, ie positive or negative. If you home positive then ideally you want to set a Home Off value equal to the travel of your axis. For example if you had a 500mm X axis and you homed positive then the Home off value would be set as 500. When you homed the axis would be fully positive and the machine coords would be set to 500. That would mean the machine coordinates zero for X was correct as X0 in machine coords would be fully negative.
Its a bit confusing to read but when you see it you will work it out as long as you remember its the relation of tool to material and not necessarily the motion of the axis.
Hood