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Can Anyone Help Identify This Gear Please

What is its pressure angle ?

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Phil P	27/07/2011 20:06:40
851 forum posts 206 photos	I have put a photo of a portion of gear teeth in my album. I know it's OD and it's number of teeth so have already figured out it's DP. Looking at the photo of the brown coloured gear can anyone offer an opinion of what the pressure angle is please. I have included a photo of a silver coloured gear of the same size which is a known 14½° pressure angle for comparison, and a couple with them superimposed on each other. Has anyone got a "foolproof" easy way of determining this for certain, I have compared it to other known gears and also to various hobs and Sunderland cutters. I think I know the answer but there is still some nagging doubt. Thanks Phil Edited By Phil P on 27/07/2011 20:13:55
Nicholas Farr	27/07/2011 20:14:10
3988 forum posts 1799 photos	Hi Phil, try this thread. http://www.model-engineer.co.uk/forums/postings.asp?th=43266
blowlamp	27/07/2011 20:24:22
1885 forum posts 111 photos	Phil, have a look at the link to the PDF in the last post of this thread. http://www.model-engineer.co.uk/forums/postings.asp?th=43266 Martin. Beaten to it!!! Edited By blowlamp on 27/07/2011 20:25:15
Michael Cox 1	28/07/2011 11:44:22
555 forum posts 27 photos	Hi Phil, If you can take a good high resolution photo of the gear and can transfer it to a CAD program then it is easily possible to distinguish gears with pressure angles of 14.5 and 20 degrees. My method is explained here: http://mikesworkshop.weebly.com/change-gear-pressure-angle.html I hope this helps. Mike

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