[python] Re: Svar: Re: crazy idea?
- From: Kurt Rutter <tokabago@xxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Fri, 29 Apr 2011 19:27:49 -1000
Interesting, I happen to have bamboo growing in the back yard...
I have seen a bike design with carbon wrapped bamboo
athttp://www.instructables.com/id/How-I-built-a-carbon-bike-frame-at-home-and-a-bam/
The concept of having printable joints is very interesting. Snap it together
and wrap the joints with carbon tape.
Kurt
On Fri, Apr 29, 2011 at 9:52 AM, Thomas Paul Jahn <tpj@xxxxxxxxxx> wrote:
> Great idea Dirk.
> I think bamboo would be just the obvious choice. Laminated with hemp fiber.
> Also the drop outs could be designed and pre-cut and then enforced with
> carbon fiber or hemp.
> Bamoboo doesn't oxidize either....
>
> cheers
> Thomas
>
>
> >>> Dirk Bonné<dirk.bonne@xxxxxxx> 29-04-11 14:36 >>>
> Attached is a drawing of such joint. It would connect 3 tubes at
> 90degree angles.
>
>
> On 29.04.2011 12:21, Dirk Bonné wrote:
> > A week ago I came across the reprap project (reprap.org), which is an
> > "open source" 3D printing machine. Such a printer can print pieces of
> > plastic, supposedly in any form as long at it is limited in size. I'm
> > very much tempted making such a machine for my self (as winter project).
> >
> > One idea I have is to build a bike (e.g. python) using the reprap. The
> > goal would be to build a trellis-framed python, like my own bike
> > (pythoon) and some others seen on the project page. I would still use
> > regular steel tubing with small diameter (8-16mm), but the joints
> > connecting those tubes would be printed plastic bits that are pressed
> > inside of the tube. The construction process would look like this:
> > 1 design all the joints connecting the tubes.
> > 2 print them -> results in "inner lugs".
> > 3 cut the metal tubes to the right length (tube cutter).
> > 4 assemble the frame by pressing the plastic joints in the tubes.
> >
> > => at this point I would like that the bike is stiff enough to hold
> itself.
> >
> > The next phase would strengthen the bike by wrapping uni-directional
> > carbon fiber around the joints (like using a tape roll wrapping it
> > around forming a "outer lug":
> >
> > 5 paint the tubes with a primer before wrapping the CF around
> > 6 cut the roll of unidirectional CF in long strands about 1cm width
> > 7 use a brush dipping the CF with epoxy while wrapping it around the
> > joints firmly connecting the tubes to the joints.
> >
> > What I hope the advantages would be:
> > * sharing: possible to share the design between people - anybody with a
> > 3d-printer could produce a bike. It would even be possible to make a
> > program that given some parameters can produce a custom measurements.
> > * easier/quicklier: the tubes are just cu wih a plain tube cutter tool.
> > There is much less measuring and filing involved (making a trellis frame
> > can really be horrible - especially when brazing where precision means
> all).
> > * easier: no need for a jig. The joints would make the frame pre-stiff
> > enough to easily adjust the frame as a whole using a measuring stick.
> > * equipement: no welding/brazing equipement needed (ok, you need a 3d
> > printer....).
> >
> > Other directions: the same process would be useful for a pure CF-bike or
> > may be a bamboo-bike...
> >
> > What is your take on the idea? Is there ny around iwth experience with
> > 3d printing product?. Could it work? Would there be a real advantage?
> >
> > DirkB
> >
> > PS: with the reprap I discovered there is a 3D CAD for programmers:
> > OpenSCAD. For those with the programming ability, it might be
> > alternative for autocad and the like.
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>
--
Kurt Rutter, RN, MSN
Kauai Community College
Nursing Department
krutte@xxxxxxxxxx
cell: 631-9131
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