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Let there be FOAM!!!
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Terry LaValle
Registered: April 2007
Location: Grand Rapids, MN
Posts: 12
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Maiden Voyage. Basement temp 66f. Kids had a blast. Mixed generously for the 25 seconds and poured within the next 25 seconds. IT took several more seconds upwards of a minute to get going. I was thinking it was a much more rapid process. Make no secret - be aware of the clock -
It went better than anticipated. Tom thanks for being so involved as we get going on this concept.
The article was true to its every word.
So, we shall see once we pop them from the PVC and take that next step...
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| · Date: Thu January 3, 2008 · Views: 2,314 · Filesize: 58.9kb, 142.4kb · Dimensions: 640 x 480 ·
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Keywords: Let there be FOAM!!!
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Tom Kirkman
Registered: March 2005
Location: North Carolina
Posts: 1,568
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Thu January 3, 2008 9:47pm
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Even though it didn't seem to be doing much, during those couple of minutes it's starting to gel and move. In warmer temperatures the expansion will happen faster and be much greater.
The key now is to get the cores out and turn into them and see what type of consistency you have. Most guys I speak with are having good results and only getting a few very minor pinholes and voids. A few have gotten some terrible voids, but I suspect they're not doing something correctly. I suspect, I really don't know for sure.
The tube can be a problem - if you pour this stuff in an open baking pan you'll get a perfect core with no voids whatsoever because the material is more free to expand and release bubbles. I am going to make up a pan holding 4 mandrels and pour into that and then cut the thing lengthwise so I get 4 turning squares. Could be the ultimate core.
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mike harris
Registered: April 2007
Location: asheville
Posts: 44
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Fri January 4, 2008 5:11pm
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That’s a great idea pouring the foam into a pan with mandrels. The larger surface area will certainly help with outgassing and should give more consistent foam. For the rods that I build I can’t ever see pouring a core more than 3” long so my L/D ratio should help insure good pours.
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Tom Kirkman
Registered: March 2005
Location: North Carolina
Posts: 1,568
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Sat January 5, 2008 9:42am
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At 75F, just 4 ounces total mix will completely fill a 10x13 inch teflon coated baking pan. The expansion will be less in cooler temps, of course, so adjust accordingly. Also remember that you can pour more fresh foam on top of the already poured and cured foam. So don't worry about coming up short - you can always add more with no loss in strength. The bond between the two pours is just as strong as throughout the rest of the structure.
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