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Old 05-25-2016, 05:38 AM   #11
Hanaldo

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I've never had an issue with core thickness, and I don't see why it would effect anything. Holes would be roughly 3mm. To be honest, I don't actually drill them, I just punch them out with a small screen driver.
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Old 05-25-2016, 07:48 AM   #12
Kevin Doe

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Thanks, I did closer to 2.3mm holes. What is a screen driver. I'd love to punch holes instead of drilling.
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Old 05-25-2016, 07:51 PM   #13
Hanaldo

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Sorry, a screen driver is like a screw driver but typed on an annoying phone

Just punch them out. I've done it with cores from 5mm to 25mm thick. Just punch it through from one side, and then push the screw driver through the hole from the other side just to clear up the hole. Much quicker and easier than drilling.
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Old 05-26-2016, 06:54 AM   #14
Kevin Doe

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Nice. Hah. Thanks.

Another thing I was thinking about. When I infused, I had the resin cup about 3 feet below the mold surface. Is this too low, creating too much of a difficulty climbing the resin tube to the mold?
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Old 05-26-2016, 11:15 AM   #15
herman

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Issues that might have caused it are vacuum level. Go as low as you possibly can. This solves a lot of dry spots.

Also keep the vacuum on for a longer period before opening the resin valve: there is air in the foam, and this could also play its part.

Infusing with mesh on both sides is perfecly possible. The holes will keep the resin fronts somewhat equalised. The resin speed below the foam will probably be slightly faster than above the foam.

To create grooves in foam press in a piece of chicken wire. Simple but effective.

Just some loose thoughts...
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Old 05-26-2016, 11:19 AM   #16
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My pump will generate ~ 29 inHg. I have found that to be typically adequate, but what is your experience?
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Old 05-27-2016, 07:57 AM   #17
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Then keep the vacuum on longer before opening the valve.
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Old 07-28-2016, 12:25 PM   #18
wochi

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just as a side note..why so many plys of material when you have a core(you didnt mention its tickness)?? wont that be waaaayyy overkill?
asking as im doing a similar project and i was thinking in two plys of carbon on top and one ply of glass+one kevlar on bottom.
I have done splitters with 5mm foam core with bonded sheets of carbon top and bottom (2 plys each) and the splitter is quite stiff. Not "racecar" stiff and thats the reason im going 10mm dininycell and infusion
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Old 07-30-2016, 08:10 AM   #19
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I have no idea what I was thinking on the number of plys. WAY too much. Significantly stiffer than required. I can literally jump on this thing w/o any measurable deflection by eye. I will likely re-do with maybe 2-3 layers per side or something like that.
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Old 07-30-2016, 08:12 AM   #20
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which core tickness did you use?
Any photos (or jumping on it videos, ahaha)?
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