AKA Country Bubba
(Older than Dirt)
I don't use MACH because as soon as you start working from G code you lose touch with the original drawing and cannot refer back to it when you want to align tool to metal.
I locate by circles on the drawing, circles with a zero thickness do not cut but I can still see them.
I pop the drawing on the screen and every circle has a little pick box dead centre. Left mouse button on a pick box moves the tool to the circle centre, right button sets the mill XY co-ordinates to the circle centre.
Drilling holes becomes a doddle on my mill/drill, alignment is all sorted at the drawing stage.
Other than that move your home switch to the Neg side of movement on your X and Y axis.
hope this helps
My software creates the cut then pumps it directly to the mill so I miss the file copying stage, no need for G code.
Having the original drawing as well as the cut available makes setting the mill a doddle, but I can't say I'd recommend it
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