pre-preg pinholes.. driving me crazy

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pre-preg pinholes.. driving me crazy

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roger sbk composites	roger sbk composites posted 11 Years Ago HOT Topic Details
Group: Forum Members Posts: 17, Visits: 163	this is the third part that comes out exactly the same and i've done 3 diff things so far.... my kitchen oven minum is 76c so i leave that 2 hours and then take it to 110c this time i added peelply on the edges but nothing... the stack is as fallowed 2 layers of pre-preg aviation no face side... ... eassycomposite unperforated release film and breather all over the mold put inside a bag and full vac... any ideas guys... this is dirving me crazy already
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roger sbk composites	roger sbk composites posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 17, Visits: 163	i put breather EVERYWHERE.... and here you can see i press down into the mold with a mixing stick and a heat gun so its driving me crazy already... more power.. did you cut the side??? or is it one full cloth??? morepower.... we are going to be best friend jejej i also have the complete ex tripple 6 molds and people want them but so far i cant pre-preg en i made this test in my kitchen oven to see what it felt like im completly new to pre-preg i am using this aviation stuff here are the instructions from ebay guy... they sound to me like instructions to start up a plasma motor lol ________________________________________________________________ Can be cured at temperatures from 250°F to 300°F, depending on service temperature requirements Recommended cure cycle is 50 psi; 3°F/min ramp to 275°F; hold for 90 minutes, cool to <140°F Low, medium, and high pressure molding techniques may be used to cure this resin system Store frozen or use within 30 days. Beyond this, material may become difficult to work with Material can be stored for 1 year at sub-freezing temperatures ___________________________________________________________________________
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pre-preg pinholes.. driving me crazy

roger sbk composites - 11 Years Ago

left one is the previous one.. wich i started sanding to try and recover the part......

roger sbk composites - 11 Years Ago

Looks like bridging from the pictures. You haven't got the cloth into the recesses in the mould....

wozza - 11 Years Ago

Yep looks like bridging on the corners and the pin holes are going to be a problem until you can...

morepower - 11 Years Ago

i put breather EVERYWHERE.......

roger sbk composites - 11 Years Ago

more power.... want to sell me those plans for the cardboard box oven please :-)

roger sbk composites - 11 Years Ago

Ok... Cool.. I know Nick from 666 and I know who made some of his moulds... long story and quite...

morepower - 11 Years Ago

I've made this video a few months ago, using the prepreg for Easycomposites....

matthieutje65 - 11 Years Ago

thanks guy.. ive seen that video im subscribed to you... i know about the eassy preg... the problem...

roger sbk composites - 11 Years Ago

Yes I cut the sides and matched them in.... Plain weave is harder to find I use a plain weave but it...

morepower - 11 Years Ago

The thing you could do is use easypreg finishing layer behind that plain weave to add some resin...

matthieutje65 - 11 Years Ago

[quote][b]matthieutje65 (20/01/2014)[/b][hr]The thing you could do is use easypreg finishing layer...

morepower - 11 Years Ago

i have a crazy idea let me know if this would work.. well i live in tropical country of costa rica...

roger sbk composites - 11 Years Ago

Haha..... the sun might just do it..... I will sort something a little more specific and try and...

morepower - 11 Years Ago

well for the ones watching and wondering i will be making another test today... this time with...

roger sbk composites - 11 Years Ago

ok im running a second test on a second vac pump in my kitchen oven... this time i put the mold...

roger sbk composites - 11 Years Ago

Ramping up is not just increasing the temp by 20 degrees, it is linear increase of temperature,...

baja_patient - 11 Years Ago

ok after cooking for 8 hours at 60C then 1 hour at 110 here is the results i can count about 5-6 pin...

roger sbk composites - 11 Years Ago

looking better... Once you get a part that works you need to do it about 3 times to make sure you...

morepower - 11 Years Ago

def cooking low temp is the trick compared to the other horrible fast cooked parts i say its not so...

roger sbk composites - 11 Years Ago

found a picture of the first part fast cooked...

roger sbk composites - 11 Years Ago

thanks to the endless help from more poweri decided to try out the VARI-PREG fabric from eassy...

roger sbk composites - 11 Years Ago

That is not bad.... As you say, you need to get your layup techniques down a little more.. You need...

morepower - 11 Years Ago

You have bridging for sure. You can see how some of the resin has tried to fill the voids and...

fgayford - 11 Years Ago

Hey I am new here but I am mechanical engineer and here are my thoughts. You have bridging for sure...

combustioncraig - 11 Years Ago

hey guys i have some updates... i found that bridging was the problem and also my layup as in plain...

roger sbk composites - 11 Years Ago

Nice to see progress mate, got any more pics of ur oven? Inside oven? Regards

Djekouk - 11 Years Ago

yeah sure... after two hours of tunning the oven... and drilling venting holes i finaly got it...

roger sbk composites - 11 Years Ago

Whats the black thing on the white heater? In ur last pic. Do u use only 1 external heater blower?

Djekouk - 11 Years Ago

Cool design :-)

Djekouk - 11 Years Ago

Get one of these too... It can be used on the parts you cook as a check of the actual temp of the...

morepower - 11 Years Ago

the black thing is a second heater as that 1500 watt max temp was 60c constant running so i added...

roger sbk composites - 11 Years Ago

[quote][b]roger sbk composites (22/02/2014)[/b][hr]the black thing is a second heater as that 1500...

Djekouk - 11 Years Ago

No problem let go on pm

roger sbk composites - 11 Years Ago

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