Re: Small Part Machining

Shane Gibson

June 30, 2011 at 10:08 AM

I agree with what Jon says. I've broken a seat bolt in the past (during
rather rigorous mountain biking ... and the results ... were very, very
painful). I searched high and low for a replacement bolt - and found that
Chown Hardware in Portland, on SE Stark carries a very very wide selection
of high quality bolts. I rode using that replacement bolt from Chown for 5
more years of hard use before retiring that bike.

You do NOT want your seat bolt to break at the wrong time. Trust me.


"Opportunities multiply as they are seized." - Sun Tzu

On Thu, Jun 30, 2011 at 9:26 AM, Jon Myers wrote:

> I would be very careful picking the material for this part. The parts
> around the seat post tend to be very highly stressed. Often these parts are
> a high strength alloy steel. These parts are typically machined in an
> annealed condition when it is softer and easier to machine. Then the part
> is then heat treated to give it a good mix of hardness, strength and
> ductility. A steel part that is heat treated to full hard can be up to 4
> times as strong as the same part in an annealed (soft) condition.
> -Jon
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