I would prefer to have the CNC machine do the holes for me.

All DR.H has to do is get the right tapp.

In the cad tool I can program the hole dia. and thread pitch....so when Dr.H's mill asks for a tool change, it will even tell him what tapp to load!

Plus some of the holes are blind...and would you really want to snap off a tapp in one!


and I dont mind about the rough milling....

For those that dont know what roughing and finishing passes look like....






To make the outside of the diff case look like the bottom pic would double (EASY) milling times.