Quote:
Originally Posted by Madison
"Plain bore" is an important part of the description of the product.
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Indeed. Plain Bore items come with a hole in them, but as madison noted, it is expected you you will bore the hole to some specific diameter that you need, then add a hole for a set screw or broach a keyway. These items are made of steel that is easier to machine, and not having the keyway or setscrew hole keeps you from breaking lathe tools as they pass over the 'gap'.
Finished bore items are often much harder steel, and more difficult to machine. Then you have the 'gap' (keyway or screw hole) that can break the lathe tools, combine them and it makes you wish you just had ordered them the right size to begin with. Oh, the finished bore sprockets that I have experience with are too hard to drill, too, so you're really in trouble....