2013/4/5 dave <dengv...@charter.net>

> Hi all,
>
> The wiki for buttress threads states the buttress threads tend to fail
> because only the first 4 threads are load bearing.
>

Not really true, all threads are bearing the load, it is just that due to
elasticity of material first one has the most, last one has the least load.
I have formulas to calculate, what percentage of the load does each thread
take somewhere in my notes from last year. Basically the rule of thumb is
that first three threads take approximately 75% of the load and it does not
make much sense to have more than 8-10 threads.

-- 
Viesturs

If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto
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