numbers are all cool and stuff but there is also the "feel" to using a pr of mics and setting a dial bore gauge. Working within .0005 should be your goal WITH SOME PRACTICE. The average seasoned machinist is doubtful at +/-.0001 just due to the 100000 variable involved with measuring. Do you realize that the oil left behind from your fingerprint is typically .0001" thick?.... a sharpie marker is about .0003". I can put the BEST steel wrist pin in my hand in a 72* environmentally controlled shop and within 2 minutes make it .00015 BIGGER than when it is at 72 degrees. Your dealing with steel and aluminum, both are about as stable as a wet 2x4 in the sun. Don't get lost in the numbers....just understand what your numbers represent.
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