Turned "Acrylic" Trashwood box - Woodworking Talk - Woodworkers Forum
 
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post #1 of 11 Old 07-17-2012, 06:05 PM Thread Starter
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Turned "Acrylic" Trashwood box

This is my turned trashwood box. Pretty easy and fun to make. It's made from flame box elder scraps put into a round mold and added a blue poly resin and put in a pressure pot overnight. Once it's removed from the mold turn it as usual. It's a little over 4" tall. The things you can make are pretty well limitless.
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post #2 of 11 Old 07-17-2012, 06:22 PM
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Beautiful! How does a presure pot work and can I make one myself?
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post #3 of 11 Old 07-17-2012, 06:30 PM
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yea thats definatly kool
im curious about the pot too
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post #4 of 11 Old 07-17-2012, 06:47 PM
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That is stunning. I generally can admire the skll of, I dunno, items with "busy" patterns and whatnot but not really like them but this....This just works! Really cool.
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post #5 of 11 Old 07-17-2012, 09:46 PM Thread Starter
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A pressure pot is just a 2 1/2 gallon paint pressure tank. It's usually rated for 60psi. Harbor Freight sells them for about 89.00. Look for an online cupon and get 20% off. With a few fittings from a hardware store and it will be ready. All it does is force resin in those very small cracks and pores of the wood. For some projects a pressure pot is not needed but when making a good trashwood resin blank it is necessary to use the pressure.
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post #6 of 11 Old 07-19-2012, 03:12 PM
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great job -- I like the form of the box as much as the neat effect of the FBE embedded in blue resin

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post #7 of 11 Old 07-21-2012, 09:07 PM
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I'm curious about the pressure pot concept. It would seem to me that you'd want to put in in a vacuum chamber to force the resin into the cracks, but instead you use high pressure (how high?). Can you explain why?
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post #8 of 11 Old 07-21-2012, 09:41 PM
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Quote:
Originally Posted by sprior View Post
I'm curious about the pressure pot concept. It would seem to me that you'd want to put in in a vacuum chamber to force the resin into the cracks, but instead you use high pressure (how high?). Can you explain why?
High pressure makes the bubbles of air smaller (compresses them).

A vacuum makes the bubbles expand -- the only way that it can draw a liquid into the gaps to replace those bubbles would be if the opposite end was at a higher pressure.

Think about a drinking straw -- you suck on one end, reducing the pressure, and the soda is pushed up the straw by the air pressure acting on the surface of the drink.

When the pressure in a pot doubles from 14.5psi (normal atmospheric pressure) to 29psi, any bubbles are compressed to half their original size. Doubling again from 29 to 58psi halves the bubble size again (now down to 1/4 original size). Doubling to 116psi halves again (down to 1/8 original size), and so on.

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post #9 of 11 Old 07-21-2012, 09:58 PM
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I guess what I was thinking was that if you draw a vacuum the pressure internally in the wood drops low so when you release the vacuum you end up with normal (high) pressure on the outside and low pressure on the inside which would suck in whatever you were adding.
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post #10 of 11 Old 07-22-2012, 08:34 AM
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Quote:
Originally Posted by sprior View Post
I guess what I was thinking was that if you draw a vacuum the pressure internally in the wood drops low so when you release the vacuum you end up with normal (high) pressure on the outside and low pressure on the inside which would suck in whatever you were adding.
This would work so long as the air that was trapped inside the cavities actually exits while the pot is at reduced pressure -- then, as you say, returning to normal pressure would make the resin impregnate deeper (provided it hadn't already cured.)

In other words, just making the bubbles bigger then making them smaller again didn't win you anything. And just making them bigger then letting the resin solidify makes things worse.

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post #11 of 11 Old 07-23-2012, 07:52 PM
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That is really cool!

Last edited by Nate Bos; 07-24-2012 at 11:37 AM.
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