[python] Re: crazy idea?
- From: Ken Pendergrass <kenp794@xxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Fri, 29 Apr 2011 06:49:54 -0700 (PDT)
Dirk,
Why not just use carbon tubes? Such tubes are becoming easier to find.
Wrapping the metal or plastic tubes in carbon tape sounds like it would be
really tedious and unpleasant. This could be a great way to offer a "kit" bike
of sorts. Ones inseam outseam or other measurements are plugged into the
software and one takes the data to a local company to be printed. Please put
me
on the list after Mr. Mages. I have been dreaming of a "tinker toy" sort of
way
of creating lugs into which tubes are glued like windcheata and others. You
are
getting really close to that idea. However I'm a luthier a master if 16th
century technology and as such I don't have the skills to write the software.
Good luck with a very interesting project.
Ken
________________________________
From: JürgenMages <jmages@xxxxxx>
To: python@xxxxxxxxxxxxx
Sent: Fri, April 29, 2011 9:19:09 AM
Subject: [python] Re: crazy idea?
Thanks Dirk - Sounds great. I really love this idea. My inseam is 86 cm
and I herewith order one of the first prototypes.
What, if you use light plactic tubes instead the steel ones? The
CF-wrapping might be sufficient and you won't have corrosion problems.
Cheers,
Jürgen.
On 29.04.2011 14:35, Dirk Bonné wrote:
> 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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