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Step 3Make your parts
Once you have your moulds made your 1/2 way there , if you look after your moulds you will get several "runs " out of them
Carbon fibre is not as expensive as you might think , and readily available on the net , my violins use less than 2 square meters of carbon fibre cloth
Carbon fibre comes in many different fabrics and weaves , ill leave it the net to explain the "K" and weave patterns and there uses.
Basicly Carbon fibre cloth is like any other cloth (soft) and once its set in resin ,it gets its strength , its the strength and acoustic abillitys of the resin that is important , fibreglass polyester resin is no good , epoxy must be used , there are several was to make carbon fibre ,
Wet lay up , is when you wet down the fabric with a paint brush and lay them up , place a peal ply over it , an absorbent layer , then plastic vacuum bag it up and suck the air out , the pressure from the vacuum bag forces the excess resin through the peal ply and into the absorbent .
Infusion , is when you lay it all up dry and vacuum bag it , waiting until the vacuum is high before allowing the resin in through a tap , once the mould has been infused you close the tap and pull a good vacuum on the mould , i like this way because it gives you lots of time to lay the layers down and your not running around like a mad man if your vacuum bag has a hole in it .
Prepeg is the professional way , manufacture has wet it down with a resin , most need ovens and autoclaves , it must be stored in a freezer even then the shelf life is short
i put down 3 layers of clear before the carbon fibre so the parts come off the moulds just needing a polish
Carbon fibre is not as expensive as you might think , and readily available on the net , my violins use less than 2 square meters of carbon fibre cloth
Carbon fibre comes in many different fabrics and weaves , ill leave it the net to explain the "K" and weave patterns and there uses.
Basicly Carbon fibre cloth is like any other cloth (soft) and once its set in resin ,it gets its strength , its the strength and acoustic abillitys of the resin that is important , fibreglass polyester resin is no good , epoxy must be used , there are several was to make carbon fibre ,
Wet lay up , is when you wet down the fabric with a paint brush and lay them up , place a peal ply over it , an absorbent layer , then plastic vacuum bag it up and suck the air out , the pressure from the vacuum bag forces the excess resin through the peal ply and into the absorbent .
Infusion , is when you lay it all up dry and vacuum bag it , waiting until the vacuum is high before allowing the resin in through a tap , once the mould has been infused you close the tap and pull a good vacuum on the mould , i like this way because it gives you lots of time to lay the layers down and your not running around like a mad man if your vacuum bag has a hole in it .
Prepeg is the professional way , manufacture has wet it down with a resin , most need ovens and autoclaves , it must be stored in a freezer even then the shelf life is short
i put down 3 layers of clear before the carbon fibre so the parts come off the moulds just needing a polish
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Dec 5, 2011. 12:14 PMpjwolos
says:
You didn't indicate how you trimmed the excess. Very nice job BTW.
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Dec 5, 2011. 6:42 PM
AussieCFviolin (author)
says:
AussieCFviolin (author)
says:
most of the cutting and trimming was done with a dremel fexi drive , using engraving bits , 1 inch cutting disks , and sanding drums , with the part submerged under water to keep the dust down and the carbon fibre cool , if you over heat the carbon fibre ( 2 seconds ) the resin breaks down and your cuts end up furry
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Dec 6, 2011. 6:57 AMpjwolos
says:
Thanks! That's a good tip. I knew about using fiber cutting discs because carbon is hard on metal but I didn't know about submersion.
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