Bike Frame Project Questions


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FrameFudger
FrameFudger
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Hi,

Got my tubes made, been using 100gsm hi-mod UD CF. next step is to jig them and epoxy the joints together and then fillet the joints, also need to epoxy carbon fibre to a titanium bottom bracket shell I am using...

Bottom bracket Shell

Will be wrapped in pre-preg UD CF. Want to make sure the bond between the titanium and CF is stronger than the just the pre-preg resin. So which epoxy to use?

Tube joining

Tubes will be mitred and then fit flush to each other. Once they have been glued I will then be wrapped further pre-preg UD CF around the joints, so the epoxy needs to be generally strong with a little flex, however will not be the only structural element taking force and load.

I was looking at the ET515 Epoxy Adhesive, but I am not sure if this is the most suitable?

http://www.easycomposites.co.uk/products/structural-adhesives/semi-flexible-15min-epoxy-adhesive.aspx

If not what would you suggest?

Joint filleting

Prior to wrapping the joints in further UD CF I need to fillet the joint so there are no sharp acute angles which could create a void after wrapping and curing.


Similar to this...

http://applemanbicycles.com/wp-content/uploads/2013/12/KoenFilletHTP1040089.jpg



What filler \ epoxy combination would you suggest, as this isn’t structural the lighter the better.

Look forward to your responses.


Cheers,

Andy



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FrameFudger
FrameFudger
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Tubes are made from pre-preg UD so I need a suitable epoxy to create the fillets. Also what kind of % weight quantities of Carbon Powder to Epoxy to Glass Bubbles would you suggest?
progetto
progetto
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Mix your epoxy and micro balloons to the consistency of putty, ideal to fillet the joint with. The fillet doesn't need to be super big, just enough to take away sharp edges. Google Velocipede salon Carbon building, it is a great thread by Nick Crumpton, one of the worlds premier tube to tube frame builder.
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