Subject: Re: [harryproa] Two-Sided Infusion
From: "Rob Denney harryproa@gmail.com [harryproa]" <harryproa@yahoogroups.com.au>
Date: 5/29/2019, 9:14 PM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

Perforated plastic would avoid the need to grind anything from the laminate.  Plastic laid into the channel for the spiral would avoid the need to cut the channel each time, although with a hand held circular saw, this is not a lot of work.  Could possibly make the channel small enough that spiral was not required.  Still need to cut small channels in either the table or the foam to get the resin to spread across the laminate, or use mesh, but the former is less wasteful and gives more bonding area to the foam, which is the weakest link.  Probably still need the perforations.     Given that the underside is where dry spots appear (and that it can't be seen until it is too late), this idea has merit.  Biggest problem is sealing the channel.  mdf, ply end grain and particle board all absorb a lot of resin.  Not a problem if the mould/table was sealed anyway.     Worth a try, I think.

eruttan is correct about the beams.  The sleeves are a tight fit so there is no wobbling.  Tow spreads the loads at minimal weight and a block on the beams stops them jamming in the hole.  Trampoline and mainsheet tension stops them falling out.   

Funny that "light and simple" gets complicated to "simplicate and add lightness"



On Wed, May 29, 2019 at 9:03 AM vpointcafe@gmail.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
 

Middle of the night idea:


If the plates of MDF forming the tool could be positioned with a gap big enough for the vacuum and inlet hoses and spiral, we could have infusion on both sides relatively independent from each other. The gap would have to be bridged by a backing plate and sealed. 


It would mean a bit of ugliness to grind and sand off on the "good" side. But it could also reduce the number of holes to drill in the foam, reduce the useless epoxy in remaining in these holes, and the core could be the cheaper solid stuff. There would be less risk of dry areas. Overall a stronger and lighter laminate would result.


The laminating table could be built the same way, with one or more channels, and the individual panels centred over them. 


Given the workboat finish the melamine/mdf gives, would the grinding scar be a bid deal?


Lots of little details to discuss if worth it. Thoughts?

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Posted by: Rob Denney <harryproa@gmail.com>
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