> I wondered about the air flow thorugh MDF but the idea came from a post I saw a couple years back that I now can't find. The guy was using 1/2" material to build the vacuum chamber and had to paint the non table areas to hold his vacuum. Now he may have been using particle board and calling it MDF, particle board is much less dense.
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> I don't want to use 1/2" or 3/4" that I can get at the home center, just too thick and heavy. My brother sent me a link showing the stuff is available from 1/8" to 1-1/8" thick. As for the air flow, it only needs to transport a very small volume of air over a relative long time since the PCB stock material is sealing the top surface of the MDF.
> I have some 3/4" MDF, guess I should go slab off a 1/4" thick piece on the band saw and see if it works.
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I can not see MDF having air flow thru it. I just took a piece of 1/4" MDF and put my BIG Shop vac on it. I did not feel any air going thru it. I can not see particle board passing any amount of air either.
Ben