Im working on upgrading my printer to be able tot print PC but that will
taken another 2 months i think, life is getting in the way. Keep us updates
and we might be able to help out
Rob
On Jan 18, 2019 11:24, "Steffen R" <big.skangster@xxxxxxxxx> wrote:
Hey folks,
I'm still stuck with PLA when printing at home. The bonding between the
layers is okay, but I wouldn't trust it when used for a bike. What about
the idea of using the printed parts to join the tubes an strengthen it
afterwards with fibre rovings (carbon, glass or aramid)?
Cheers
Steffen
Am Fr., 18. Jan. 2019, 11:04 hat Rob Raymakers <r.raymakers@xxxxxxxxx>
geschrieben:
If the plastic tubes are splitting at the ends, you could slide a ring
over the ends of the tubes for extra strength. The plastic wants to
expand/split, but it can't because the ring is not giving the plastic any
room.
Using metal in some high stress areas would be no shame. It doesn't have
to be perfect the first or 5th time.
Rob
On Fri, Jan 18, 2019 at 1:54 AM Robert Semenoff <
dmarc-noreply@xxxxxxxxxxxxx> wrote:
Matthias, I actually did a static simulation on a bike component design
involving 3d printed parts, and the results were not encouraging....plastic
just is not strong enough. I would recommend sheet metal. Dont know how
much experience you have with it, but there’s a lot of creative potential
and you can rapidly fabricate protos with simple handle tools, and then
potentially transfer it to laser cut production later. You can easily find
scrap sheet metal around everywhere, so Im surprised there arent bikes
being made. Although I haven’t built a sheet metal bike either so maybe
there’s good reasons for that..
On Wednesday, January 16, 2019, 11:47:59 AM PST, Matthias B. Schönborn <
mbs@xxxxxxxxxxx> wrote:
Robert, thanks for pointing out Fusion 360! I've been thinking about
simulating the frame for its stability and did not know about Fusion 360.
I'm also very curious to see how well the joints will perform eventually. I
would not try this project if it weren't for the videos about the "PVC and
duct tape" python bike on youtube.
On 15.01.19 22:10, Robert Semenoff (Redacted sender semenoff for DMARC)
wrote:
Hi Matthias, it's an impressive concept for sure! Just the idea of using
that type of space frame, with
many triangles, is very interesting.
I wouldn't have thought PVC would be strong enough, but who knows.
Did you know that fusion360 is free for non-commercial use? And it has
static simulation which would tell you if the PVC is going to cut it,
strengthwise. Or even will the joint/nodes be strong enough...I have my
doubts about that I think the nodes strength is going to be critical ...
Robert
On Tuesday, January 15, 2019, 12:27:27 PM PST, Matthias B. Schönborn
<mbs@xxxxxxxxxxx> <mbs@xxxxxxxxxxx> wrote:
Hello everyone,
I hope by putting the right subject I can make this message append to
the right thread, since I've not been a member of the mailing list at
that time. I've decided to try to build a python bike using PVC tubing
and joints printed from PETG. I've just created a page in the wiki,
which I hope we can have the discussion at:
http://en.openbike.org/wiki/Printed_Plastic_Python
I'm very much looking forward to a fruitful discussion!
For reference, you can also download the hole OpenSCAD design from
Github: https://github.com/mattbenscho/PrintedPlasticPython
Best regards,
Matthias
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