Kirk Wallace wrote: > On Sat, 2009-05-09 at 11:45 -0700, Kirk Wallace wrote: > >> I would like to make gears, but I need to know the tooth shape in order >> to make a form tool or cut an outline. This is what I came up with, if >> there are any mistakes or bad assumptions, please let me know. >> >> I referenced: >> http://en.wikipedia.org/wiki/Gear >> http://en.wikipedia.org/wiki/Involute_gear >> http://en.wikipedia.org/wiki/Involute >> http://en.wikipedia.org/wiki/Rack_and_pinion >> >> My example gear is a 2m(module) pitch - 20mm. >> >> A sample is on this page: >> http://www.qtcgears.com/RFQ/default.asp?Page=../KHK/newgears/KHK044.html >> (Short URL) http://alturl.com/whp2 >> >> Pitch is the tooth length, but expressed in pitch circle diameter, so a >> > ... snip > > Dooh, I've had my Dad's Machinery's Handbook for almost twenty years and > it hadn't occurred to me until now to see if there is any gear > information it. It seems to cover everything I've been trying to hash > out the last few days, including the ANSI 20 degree rack form. The > gearing section is about four hundred pages, fortunately, about ten or > fifteen cover what I need. One problem is my 1971 edition doesn't cover > metric gears, so if anyone has any leads to the metric standards, I'd > appreciate hearing from you. I suppose I could just buy a current > edition. > > I found another interesting link here: > http://science.howstuffworks.com/gear8.htm > > > My 1974, 19th Edition, Machinerys handbook, has British metric standards but they may be different. Their threads are. Seems everyone wanted to go metric, but they just wanted their own metric standards.
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