Quote Originally Posted by Robin Hewitt View Post

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.
May I ask what you use if you do not use g code?

bruce