C
A question for machinists and for chain and sprocket experts . . .
Are the bumps between these old teeth just irrelevant material left
over from machining small inch-pitch gears? The long-lost secret to
longer skip-chain life? Impacted half-inch pitch wisdom teeth?
Big bumps, 9-tooth, 1900 through 1914:
http://www.nostalgic.net/index.asp?S=arc/pre1920/1900's+wood+rims+with+hub+3.jpg
http://www.nostalgic.net/index.asp?S=arc/pre1920/1901+Wyoma+hub+2.jpg
http://www.nostalgic.net/index.asp?S=arc/pre1920/1902+Eadie+1.jpg
http://www.nostalgic.net/index.asp?S=arc/pre1920/1903+Morrow+hub+1.jpg
http://www.nostalgic.net/index.asp?S=arc/pre1920/1906+Durkop+hub+3.jpg
http://www.nostalgic.net/index.asp?S=arc/pre1920/1909_Eclipse1.jpg
http://www.nostalgic.net/index.asp?S=arc/pre1920/1914_Eclipse_1.jpg
(nice tool)
Big bumps, 10-tooth:
http://www.nostalgic.net/index.asp?S=arc/pre1920/1906_Cinch2.jpg
Faint bumps, 8-tooth:
http://www.nostalgic.net/index.asp?S=arc/pre1920/1890's+straight+pull+hubs+1.jpg
Faint bumps, 9-tooth:
http://www.nostalgic.net/index.asp?S=arc/pre1920/1901+EZ+hub+2.jpg
No bumps, 9-tooth, 1904 through 1910:
http://www.nostalgic.net/index.asp?S=arc/pre1920/1904+Eadie+hub+1.jpg
http://www.nostalgic.net/index.asp?S=arc/pre1920/1908+Corbin+Duplex+hub+2.jpg
http://www.nostalgic.net/index.asp?S=arc/pre1920/1910's+Thor+straightpull+rear+hu.jpg
No bumps, 10-tooth:
http://www.nostalgic.net/index.asp?S=arc/pre1920/1913+Corbin+Duplex+hub+1.jpg
No bumps, 7-tooth:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=280153069111
The bumps _seem_ to be absent from much larger front sprockets:
http://i2.ebayimg.com/04/i/000/b6/3f/7abd_1.JPG
http://i9.tinypic.com/4taqys4.jpg
http://www.nostalgic.net/pictures/1649.htm
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=160157336995#ebayphotohosting
http://www.nostalgic.net/pictures/1474.htm
http://www.nostalgic.net/pictures/871.htm
Cheers,
Carl Fogel
Are the bumps between these old teeth just irrelevant material left
over from machining small inch-pitch gears? The long-lost secret to
longer skip-chain life? Impacted half-inch pitch wisdom teeth?
Big bumps, 9-tooth, 1900 through 1914:
http://www.nostalgic.net/index.asp?S=arc/pre1920/1900's+wood+rims+with+hub+3.jpg
http://www.nostalgic.net/index.asp?S=arc/pre1920/1901+Wyoma+hub+2.jpg
http://www.nostalgic.net/index.asp?S=arc/pre1920/1902+Eadie+1.jpg
http://www.nostalgic.net/index.asp?S=arc/pre1920/1903+Morrow+hub+1.jpg
http://www.nostalgic.net/index.asp?S=arc/pre1920/1906+Durkop+hub+3.jpg
http://www.nostalgic.net/index.asp?S=arc/pre1920/1909_Eclipse1.jpg
http://www.nostalgic.net/index.asp?S=arc/pre1920/1914_Eclipse_1.jpg
(nice tool)
Big bumps, 10-tooth:
http://www.nostalgic.net/index.asp?S=arc/pre1920/1906_Cinch2.jpg
Faint bumps, 8-tooth:
http://www.nostalgic.net/index.asp?S=arc/pre1920/1890's+straight+pull+hubs+1.jpg
Faint bumps, 9-tooth:
http://www.nostalgic.net/index.asp?S=arc/pre1920/1901+EZ+hub+2.jpg
No bumps, 9-tooth, 1904 through 1910:
http://www.nostalgic.net/index.asp?S=arc/pre1920/1904+Eadie+hub+1.jpg
http://www.nostalgic.net/index.asp?S=arc/pre1920/1908+Corbin+Duplex+hub+2.jpg
http://www.nostalgic.net/index.asp?S=arc/pre1920/1910's+Thor+straightpull+rear+hu.jpg
No bumps, 10-tooth:
http://www.nostalgic.net/index.asp?S=arc/pre1920/1913+Corbin+Duplex+hub+1.jpg
No bumps, 7-tooth:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=280153069111
The bumps _seem_ to be absent from much larger front sprockets:
http://i2.ebayimg.com/04/i/000/b6/3f/7abd_1.JPG
http://i9.tinypic.com/4taqys4.jpg
http://www.nostalgic.net/pictures/1649.htm
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=160157336995#ebayphotohosting
http://www.nostalgic.net/pictures/1474.htm
http://www.nostalgic.net/pictures/871.htm
Cheers,
Carl Fogel