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Originally Posted by Andrew Blair
So, the question is, should I buy the .3120 reamer, and be right on tolerance(assuming no tool slop) or go with the .3115 reamer, which is still within tolerance, but would give me a bit of play as far as oversize goes. Does a typical reamer end up making a bigger hole, or a smaller hole due to tool wear?
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Hmm, good question. When you start talking about 1/2 one thousands of an inch you really need to take into account the tolerances of your equipment. I assume you have access to a lathe since you are talking reamers. How good is it? I would be inclined to think that your lathe will introduce at least a little bit of error. A lathe chuck with .0002 or .0003 runout is pretty good in my book. I would think that if you have a decent lathe you should go for the .3115 reamer and with a little added error on the alignment of your lathe and chuck you might be pretty close to spec.