Re: cnc/copy mill teach

FWIW, if you use TurboCNC for digitizing you can digitize with a
course grid and then with a fine one over an area you may be
particularly interested in. All the points taken get appended to the
same points file it does not matter what order the points were taken
in and what the spacing is the file just contains points. I suspect
the same is true for Mach. For most 2D parts I might consider
digitizing sideways, make the mill think the y axis is the z axis and
define the limits of the digitizing to be a single line in x. Then
repeat the process from each side of the part (changing which axis
is "z") then load up the file in the CAD and play with it. "Pecking"
at a 2D part is madness in most cases. You can use center finding for
holes and use the method I just described for internal orifices too.

For small parts perhaps scan them on a flatbed.

Graham