Hi DirkB,*
nice idea. I stumbled onto this article the other day:
https://3dprint.com/74810/3d-printed-supercar-blade/
carbon tubes and printed connectors for a super car frame.
of course they had to go for steel connectors....
is suspect, even if we stick the connectors into the tubes, we would
have about 1,5x the tube diameter worth of plastic connector lenght
unsupported, and thus free to break or at least flex without much
stiffness...
how about printing a negative connector shell in 3D, fill wax into it
and put that in a sandbox for metal casting?
- DirkS
Zitat von Dirk Bonne <dbonne@xxxxxxx>:
Hi Philip
My idea was to be able to provide "python kits".
1) A designer would provide a list of tubing (sizing and length) + files to
print kind of "inner lugs".
2) A builder would get the tubes and cut them to length.
3) Then she would print the lugs. These lugs would then act as connectors
for the tubes.
The lugs were to fit *into* the tubes. These lugs would not give strength.
It would just make hold the tubes in the correct place. The builder would
then need to use epoxy and carbon fiber to strengthen each joint. As a
sidenote, you can get carbon fiber in tape rolls (they are not weaved).
Advantage would be that with minimal workplace/tools somebody would be able
to make a bike. Furthermore one could provide the tubes and lugs further
making building accesable for the builder.
I have no tried it in practice because I had trouble getting access to a
printer.
greetings dirk
GESENDET: Montag, 21. August 2017 um 20:25 Uhr
VON: "Philip Hahn" <hahnpv@xxxxxxxxx>
AN: python@xxxxxxxxxxxxx
BETREFF: [python] Re: 3D printing
As much as I love the idea - as someone who both cycles as a primary
vehicle and has melted 10+kg of plastic in his printer over the last year -
this will not be a robust or safe idea in any available plastic. The
deposition of layers in the X-Y plane results in weakness in the Z plane,
highly susceptible to both shear and tensile loading. Think of it as
separate laminations which have a weakness in bonding between laminas.
I would suggest perhaps that idea of tubes and connectors aimed at the CNC
community. Homebrew hobby CNC machines are built for under $1000 or about
3x the cost of a decent printer. They are driven by the same gcode so you
can prototype on your printer and then make metal parts with the same code.
I'm currently working on such a CNC conversion at the moment.
philip hahn
On Mon, Aug 21, 2017 at 11:17 AM, Jürgen Mages <jmages@xxxxxx> wrote:
I think, it is about time to reanimate an idea, made by Dirk Bonné in
2011: The 3D-printing of a python frame. I guess, the printing
technology has advanced in a way, we can seriously start to work with it.
Thus I have set up a wiki page:
http://en.openbike.org/wiki/3D-Printing
Here we can gather all useful information and hopefully one day the
first prototype will be made.
Everybody interested is invited to contribute ...
Cheers,
Jürgen.
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