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<p>[QUOTE=&quot;springfld.arsenal, post: 331078, member: 54&quot;]This is what I call a split double sprocket with sawtooth profile.&nbsp; It can’t be “driven” since the inside is smooth, so it can only be an idler.&nbsp; Usually a chain runs on a sprocket (think bicycle.)&nbsp; I asked on the machinist forum “ what kind of chain runs on this sprocket?”&nbsp; They aren’t yet in agreement on that question.&nbsp; Most chain sprockets have a roughly-parabolic tooth profile, unlike this one with V-shaped teeth.&nbsp; These sprockets are made as two halves that are held together with two socket-head capscrews.&nbsp; The two-piece construction allows them to be installed on a shaft where neither end is accessible.&nbsp; The two halves were stamped with matching numbers when made so the assembler won’t get them mixed up; there&nbsp; may be some slight differences in dimensions from one pair of halves to another and you wouldn’t want to risk something bad happening after installation in the end product.&nbsp; Those “match numbers” tell me that these sprockets were made on non-CNC machinery, because if made on any modern CNC machinery, each piece would be so identical to all others made on that shift that all would be interchangeable, and the numbers shouldn’t&nbsp;&nbsp; be needed unless called out in the drawing.[ATTACH=full]110717[/ATTACH][/QUOTE]</p><p><br /></p>

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