M Greenaway said:
Agree with the above that a go/no go plug gauge is probably the best method of determining if a bore is acceptable or not, as it mimics the actual application of the bore, and measures the entire bore surface from front to back. A CMM or bore mic only measure points on the surface.
OK Gang. . . another opportunity to jog The Taz's memory bank of "Believe It Or Not" rediculous situations. . .
Once upon a time in a galaxy far far away. . . I was a VP of QA for a fastener manufacturer. . . in that capacity I had alot of practice explaining the many intricacies of fastener gaging to customers.
One of the special fasteners had a .062" diameter in the point end of it. Two gentlemen from a customer called and stated, "The hole measures .00205" undersize on our new $120,000 CMM."
I had one of the parts they had returned and went to my trusty Pin Gage Set and selected a .0620" +.0002" GO Pin and checked the part. It dropped in and I told the gentleman so. They then, in their infinite scientific wisdom, decided to get the (Lady) boss on the line to settle the dispute. They explained how they checked the parts with their new $120,000 CMM, and I explained how I checked the part with my $1.75 Pin Gage. She was very quiet for a moment. . . she then thanked me politely and requested that her two "scientists" join her in her office.
Simple wins!
