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Unread 25-05-2014, 22:44
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Tristan Lall Tristan Lall is offline
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Re: paper: WCP/VexPro Gear Calculator

Profile shifting is the term you're looking for. See here for an explanation of the method, and here for some diagrams and equations. Basically, you cut fewer teeth on a given diameter blank than would ordinarily be expected; the profile shift describes the different tooth shape that is required. (One common reason to do this is to avoid the undercut that is evident on low-tooth-count gears, especially with 14.5° pressure angles.)
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