removing pin holes


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Toffee
Toffee
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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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morepower
morepower
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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 ! BigGrin




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. 
Edited 9 Years Ago by morepower
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