Quote:
Originally Posted by Ninja_Bait
Why not? If you find a bolt that you want to use, for whatever reason, and you don't know what size it is (let's say you dug it out of a bin of unsorted machine screws of various practically indistinguishable sizes), testing it in the holes in a drill index or a drill gauge could easily tell you what hole size you need.
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What does that tell you? The hole in a drill guide are oversized quite a bit, so it's easy to put the bits in and out. Probably if you put a 1/4 inch bolt in the hole for a 1/4 inch drill bit, it would fit in really loose because the hole is larger. If you then used the 1/4 inch bit to drill your holes as you suggest, you wouldn't be able to assemble the parts because of tolerances. You may not even get 1 in since the bit wears down.