This grinding of the tips has the effect of bringing the teeth to a truer cycloid shape.
If you look at industrial cogs they often use this shape, as it does run better with a worn chain. Something like a 1911 Brittanica will explain the whole thing.
Joe Bender-Zanoni
Great Notch, NJ
> Thanks, Len.
\r?\n> I had to first look up "cogent" in my dictionary ("forcibly
\r?\n> convincing"), but I also read a few other's posts after I posted,
\r?\n> so I
\r?\n> must at least credit Carl Gonzalez and "Berkeley" Brian for being
\r?\n> on to
\r?\n> the same cure.
\r?\n> In Brian's case, the increased chain tension helps force the roller
\r?\n> past
\r?\n> the reverse-shark-finned tooth's corner. This should work for
\r?\n> milder
\r?\n> cases, and I once even had this work for me when my touring bike's
\r?\n> worn
\r?\n> granny ring would often slip during impact loading over severely
\r?\n> rough
\r?\n> ground.
\r?\n> Carl grinds off the driven-side corners, as I do.
\r?\n> Again, these solutions address sprocket wear at the base of the
\r?\n> tooth.
\r?\n> Well-"roached" drivetrains need not apply!
\r?\n>
\r?\n> David Snyder
\r?\n> (rainy) Auburn, CA
\r?\n> ----- Original Message -----
\r?\n> From: lennys_email@juno.com
\r?\n> Subject: skipping chain
\r?\n>
\r?\n>
\r?\n> david,
\r?\n>
\r?\n> that was a remarkably cogent discourse on the chain/sprocket
\r?\n> interface. my compliments. you must be a very fine mechanic.
\r?\n>
\r?\n> best regards,
\r?\n>
\r?\n> len