Posted by BillS on June 21, 2012 at 19:53:16:
Hi All,
This is primarily for those who use CPC-24 for straight bevel gears.
There is a user of CPC-24 who chooses the "Old 14.5 PA System" and he changes PA to 20 PA. By doing so, he finds that the chordal thickness at the heel is correct but at the toe, he has to cut toe .030 thicker than CPC-24 calls for to get correct bearing.
My first question is: what is it about the "Old System (14.5 PA)" changed to 20PA that might lead a user to choose it over the newer AGMA system?
Also, is there an outdated System that calls for 20 PA? I can only think of the "20 PA Stub Tooth System" which preceded the current AGMA system, but is there a British or International system that I should include in CPC-24?
Sorry to ramble on, but this one has me puzzled...