ger21,

I'm sure you are somewhat correct, however in MeshCAM when I enter the size of the stock there are also some checkboxes...which indicate if I want to center the part on the x and center on the y and if I want the part centered in the z.

It is quite difficult to center on the middle of the stock, as I'm sure you are aware of.

So, the edge of the stock is the easiest to use for zeroing the x and y-axis in Mach3. I have no problem with the z-axis...using the Big-Tex modification of the Aussie SW.

All I need to know is what MeshCAM is expecting. All the tool diameters are selected in MeshCAM.

Paul