Ducati engined café racer

Hi. Short update.
I'm getting closer on the frame design. Between the first version and the second I made the frame about 40mm longer. But now I have decided that 20mm is probably enough. So now the wheelbase is about 1400mm. So still nice and short.
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Out of curiosity, why not go with a Trellis frame that Ducati built, that is tried and true, and build around it?

Either way, looks neat.
 
JadusMotorcycleParts said:
So cool man, looking good. Great to see the addition of some context (the cad man) to make sure its all in proportion.
Thanks. Yea I needed to see the proportion in the cad sometime it's hard to see how big things are when your drawing. Design is still not set but slowly getting there.

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J-Rod10 said:
Out of curiosity, why not go with a Trellis frame that Ducati built, that is tried and true, and build around it?

Either way, looks neat.
Thanks. Yes that would probably be the cheapest and most sensible way to go. But how boring wouldn't that be .
I need to get my mind of things So building stuff is kind of therapy for me.




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HansS said:
Thanks. Yes that would probably be the cheapest and most sensible way to go. But how boring wouldn't that be .
I need to get my mind of things So building stuff is kind of therapy for me.




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I totally agree if you have the time to do it :) I would love to have the time to build my own frame for a custom build!
 
Tinkering with the seat position I realized i need footpegs. So I let the 100$ 3D-printer rip. 4 hours later rightside bracket done. Tonight I hope I get the last parts done.
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I suppose 3D printing will be the future of custom builds with parts that aren’t manufactured anymore, how strong is the actual finished product? I never imagined plastic foot pegs would stand up to much abuse


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Blano said:
I suppose 3D printing will be the future of custom builds with parts that aren’t manufactured anymore, how strong is the actual finished product? I never imagined plastic foot pegs would stand up to much abuse


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They won't last long at all, and if they're ABS the sun will eat them alive. 3D printers are for prototyping, not final products. Something to design, get fit, then send off to a machine shop to produce.
 
irk miller said:
They won't last long at all, and if they're ABS the sun will eat them alive. 3D printers are for prototyping, not final products. Something to design, get fit, then send off to a machine shop to produce.
Ahh that makes sense


Current build:

1979 Honda Cb650z cafe/brat
 
Im just trying differnt designs. Its amazing how strong the parts are.
At work we are using alot of 3d printed metal parts. Exhaust and turbo manifolds, brackets and lots more. But its still to expensive for series production.


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So I decided to ditch the honda cbr 600 wheels. The hub and the swing was just to wide and looked out of place.
I got hold of a KTM swingarm for $30, a really nice cast piece and really nice weldable aluminium so I'm going to cut it up, make it shorter and wider.
I got a OK price on a used pair of supermotard wheels from a VOR 503 together with brake calipers front and rear. So now I need to make another jig for the swing arm.
Still working in the CAD with the frame. It's getting there slowly..

First pic. right length.
Second pic. KTM swingarm.
Last pic. KTM swingarm 150mm to long.

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Short update. Welding fixture is almost done. Started to cut up the KTM swingarm.
Trying out headlight height. Higher or lower?

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this is turning out awesome. if that profile line is an approximation of the fuel tank i think the headlight looks good there.
 
looking good so far man.
what size tubing are you using for your frame?
also wondering if you ran some stress analysis on your cad design?
I've been trying to find a way to make a stronger lightweight frame for a spare engine as well, and the results have been very interesting.
Sometimes moving the ends of a couple tubes by an inch would reduce the stress by 30%.

can't wait to see where this ends up.
 
Thanks. Im using 25x1.5mm Docol R8 pipes. Its like CrMo but with better weld properties.
Yea I have done some calculations but im not there yet. Im still moving pipes around.
As you say, it amazing moving a joint just a couple of mm sometimes make a huge difference in stiffness.
Done some milling today.✌

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