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removing pin holes
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Toffee
Toffee
posted 10 Years Ago
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Hi all,
I have made a few parts which have a few pin holes, whats the best/easiest method for removing these, do you just mix a bit of resin with fast hardener and keep applying until the hole is filled and then flat off or is there a better method?
cheers
Lee.
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20_rc51_00
20_rc51_00
posted 10 Years Ago
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Here are a few recommendations from various sources as to lay up schedule etc.. all which I pulled from the net with a bit of digging.
The cytec doc talks about edge bleeding and top bleeding for debulk and for sure if I recall correctly. Might want to try each/both. One or the other may drain too much resin or not enough. If the SHD TDS had this info it would be what you're after etc. Nothing says that you can't actually come up with a better way too. Also I would suggest stretch out the dwell time so that the resin is at it's thinnest for quite a while. This can allow air to be pulled off, but may be what leads to too much resin pulled off too with one method or the other.
Also, report back with your results !
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CYTEC TDS1019_User_Manual_LTM_Prepregs_Adhesive_Films_Issue4b.pdf
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2-ACP_Lecture_31.05.2012-OOA_Prepreg_Processing.pdf
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10 Years Ago by
20_rc51_00
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morepower
morepower
posted 10 Years Ago
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20_rc51_00 (16/10/2015)
Here are a few recommendations from various sources as to lay up schedule etc.. all which I pulled from the net with a bit of digging.
The cytec doc talks about edge bleeding and top bleeding for debulk and for sure if I recall correctly. Might want to try each/both. One or the other may drain too much resin or not enough. If the SHD TDS had this info it would be what you're after etc. Nothing says that you can't actually come up with a better way too. Also I would suggest stretch out the dwell time so that the resin is at it's thinnest for quite a while. This can allow air to be pulled off, but may be what leads to too much resin pulled off too with one method or the other.
Also, report back with your results !
The problem with using other recommendations from other suppliers is you are up against different chemistry. Some will work or help others will make it worse.. I spent 6 months with one material getting different results from small changes and it has been a mixture of breather stack and ramp and dwell that I spent all my time on. Oddly some moulds need peel ply on the flange to bleed air and some don't. After a while you get to know which ones do and which ones don't. But the cure schedule never changes. You just need to make sure the oven is accurate with even temp top, bottom and middle or find a way to make sure you have the parts where the oven is working best. You may have to fine tune the controller and compensate for any differences. Mine is 2 degrees different from the thermocouple location to the centre of the oven. Dwell times are important but I have found controlling ramp is actually more important than you think. Moulds may have different thickness so getting the moulds to all heat up within a margin that keeps them quite close will make all your parts cure consistently.
Its a bit of work to get your oven to be consistent but it is worth it... The SHD cure schedule is based on my findings and although I have not given them my breather stack info it is not to hide anything it is simply due to different moulds work differently so the only thing that will not change is the cure cycle.
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morepower
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removing pin holes
Toffee
-
10 Years Ago
That's generally the best method, but it's a lot of work given resin doesn't sand easily....
Hanaldo
-
10 Years Ago
:) thanks for the tip.
Toffee
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10 Years Ago
If you plan to lacquer the part just skim it with APF7 Its a black filler like p38 but made for...
f1rob
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10 Years Ago
[quote][b]f1rob (13/05/2015)[/b][hr]If you plan to lacquer the part just skim it with APF7 Its a...
flamypie
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10 Years Ago
I would also like to know where to get this product has anybody here tried this? Wiping filler...
Bonobo
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rob is that the name for the infamous 'black magic'?? i couldnt remember the company who makes it,...
scottracing
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10 Years Ago
"black magic" sold by Ami-con among others
f1rob
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10 Years Ago
"black magic" sold by Ami-con among others
f1rob
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10 Years Ago
I know this is a quick fix but you need to find a cure schedule that you can get to work...
morepower
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10 Years Ago
I know from reading earlier posts that you've spent a lot of time getting the cure schedule right to...
MarkMK
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10 Years Ago
[quote][b]MarkMK (15/10/2015)[/b][hr]I know from reading earlier posts that you've spent a lot of...
morepower
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10 Years Ago
now that is some quality looking parts, and exactly what you should be able to achieve with...
scottracing
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10 Years Ago
Here are a few recommendations from various sources as to lay up schedule etc.. all which I pulled...
20_rc51_00
-
10 Years Ago
[quote][b]20_rc51_00 (16/10/2015)[/b][hr]Here are a few recommendations from various sources as to...
morepower
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10 Years Ago
If it's some help try a majorcompany namedPPG paints they have branches in Australia and other parts...
sam
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10 Years Ago
If it's some help try a majorcompany namedPPG paints they have branches in Australia and other parts...
sam
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10 Years Ago
Having had a look at the SHD PDF, it certainly does look like it offers the opportunity for some...
MarkMK
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10 Years Ago
Mark. To be honest ignore the fact you CAN get a 3 hour cure. Too many seem to want to cure hot and...
morepower
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10 Years Ago
Thanks for the comprehensive reply morepower, it certainly seems like it's worth trying out with so...
MarkMK
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10 Years Ago
SHD have a new material they are developing. Its a higher temperature cure but still classed as a...
morepower
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10 Years Ago
We have tested a few OOA carbon fiber prepregs some time ago, and generally OOA prepregs works with...
ArturK
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9 Years Ago
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morepower
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9 Years Ago
Same with EasyPreg. I had some issues making these parts initially, but after working on my cure...
Hanaldo
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9 Years Ago
Hanaldo, I think it is most want to have a material where the guidelines given work 100%, 100% of...
morepower
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9 Years Ago
[quote][b]morepower (21/11/2016)[/b][hr]Hanaldo, I think it is most want to have a material where...
Hanaldo
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9 Years Ago
[quote][b]Hanaldo (22/11/2016)[/b][hr][quote][b]morepower (21/11/2016)[/b][hr]Hanaldo, I think it is...
morepower
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9 Years Ago
Ive been using shd a lot more at work. But the vtc401 in the clave and the press. Hopefully trying...
scottracing
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9 Years Ago
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Hanaldo
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9 Years Ago
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TomDesign
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9 Years Ago
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Hanaldo
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9 Years Ago
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TomDesign
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9 Years Ago
I only really do smallish things. Anything bigger than say 0.5sqm I will usually infuse, just due to...
Hanaldo
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9 Years Ago
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morepower
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9 Years Ago
so guys i simply need to make big owen correct? any help what is needed?
TomDesign
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9 Years Ago
[quote][b]TomDesign (05/12/2016)[/b][hr]so guys i simply need to make big owen correct? any help...
morepower
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9 Years Ago
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