[python] Re: no weld python

On Tue, Jun 3, 2008 at 5:50 PM, Kevin Bailey
<ke-python@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Tue, Jun 03, 2008 at 09:38:29AM +0200, Uipko Berghuis wrote:
>> On Mon, Jun 2, 2008 at 8:47 PM, Olaf Johansson <home@xxxxxxxxxxxxxxxxx> 
>> wrote:
>> >
>> > Someone should mention carbon fibre and epoxi.
>> >
>>
>> Carbon is certainly a no weld option but I think it will cost the same
>> or more as welding. And it is probably also more difficult, anybody
>> experience with both methods?
>
> The only cost with composite building is the materials. There's
> no expensive equipment that you may never use again.

Please correct me if I'm saying stupid stuff..... my only composite
experience is making a kitesurfboard. Before doing that I read a lot
about and I find it a really interested metarial. One of the projects
on my list is making a composite tail faring. The ultimum would be to
make my own (light weigth) carbon bike ;). But I think Jaculus has a
point changing a steel frame sounds way easier to me. So I first have
to learn to weld to make a steel prototype, adjust it till its the
perfect bike for me and than make a carbon version.

Don't you have to use a vacuum pump,  bag breeder etc. if you want to
make round shapes? And I think you also need to make molds or not?

Or do I make things to complex? Is it possible to make a foam frame
and just wrap around the composite?

> Carbon
> fiber is expensive, but you could also build it out of fiber
> glass which is almost a tenth the cost. Before saying that fiber
> glass isn't strong, or you have to use more to get the same
> strength, recall that they make airplanes out of it (which is
> where my experience comes from.)

I think the "problem" is that glas is more flexibel and you want your
frame as rigid as possible. Probably you can solve this by using a
more rigid core, for example a foam wood combination (like the
stingers in a surfboard). Or you can make a sort of sandwitch of foam
and glas to build a more rigid core.

Uipko
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