Talk Composites - The Forum for Advanced Composites

shringage after vaccum

http://www.talkcomposites.com/Topic29240.aspx

By KostasBiz - 9/3/2018 4:14:35 PM

On my first try to produce a composite part a came across this unexpected issue .I 3d printed a fork core for a bike frame i wrapped the core to CF and then vacuum bag it.But when i measured the dried part the fork legs were closer(25mm-1') they previously were !!!
here my photos 

why this happened ?How can i over come it ?Should i alter my design in order to compensate for the shrinkage ?Should i build a support to hold the fork legs in the vacuum bag ?Thanks in advance!
By KostasBiz - 9/11/2018 6:44:12 PM

 
f1rob - 9/6/2018 8:25:28 PM
Unless I'm looking at your pic really funny you have your job across the bag ???Just run your job along the bag an cut your bag a lot longer

Yes you are right , i was a lot stingy with my consumables ... and i learned that in order to save small you spend big .
That was  exactly what i had in mind  , i just finished redesigning  my forks  (chainstay and seatstay ) and a support rod to hold the legs in place .
Unfortunately i have the chance to work only on weekends  , so mid week is desing and print only . I will post again as soon as i have a new result .Thanks for the feedback.