Among the many issues that I have been having with this particular part another one just popped up. Here are some details, this particular part is cast aluminum. The hole I am now having problems with is a 3 inch long 8mm hole that goes through 1 inch of material, then 1 inch of a cored out area, and back into another inch of material. The hole must be perpendicular to datum A within 0.002in. I am using a solid carbide accupro drll with 150 drill point and going straight through no pecking. I then follow with a spiral flute reamer with 3 inches of flute length. Also, even though the CMM reports that the hole is out of tolerance, about 0.003, I am still able to pass a very tight slip fit pin all the way through. Please provide input...