Chainring grinding service (creation of chainring guards for cyclocross and single speed use)



A Muzi wrote:
> RobCam wrote:
>
> > OK - So I don't have a grinder. Does anyone know of a place that will
> > do this for a fee? Seems like a good money making scheme for someone.
> > At $30+ for new chainring guards, a price of $20 per ring mod would be
> > great. Shipping wouldn't be much. Any takers?
> >

> Most chainrings are aluminum, not steel. Aluminum won't burn
> on a grindwheel and in fact trying that may be unsafe as
> aluminum or brass can load up on the wheel and cause
> catastrophic failure. (pieces of stone flying out from 1760
> rpm). I have never seen that happen but it's mentioned in
> two machining texts.
>
> If you want to trim a chainring, try a file. It shouldn't
> take long. I'll gladly file your teeth away for $20!!
>
> --
> Andrew Muzi
> www.yellowjersey.org
> Open every day since 1 April, 1971
 
On 2005-07-25, Werehatrack <[email protected]> wrote:

> Thermite is nasty stuff. A soda can full of it placed on the hood of
> a car and ignited will melt its way *through* the engine. When it
> hits the oil pan, things get really interesting.


Yup. Back in the days when oxy/acetylene wasn't readily available, they
used it for butt welding e.g. railroad tracks in remote areas.

--

John ([email protected])