Measuring Surface Flatness (was "Cabinet Grade Particle Board")

[Bill Glaze]

Bob:
Do I recall when such a room as you describe was known as a "Faraday 
Cage?"  Or am I having one of RvP's "Senior Moments?"  (No offense, Ron! 
O:-) )
Bill Glaze

Bob Richards wrote:

> The ideal material I have seen is used in RF shielded room walls. It 
> is 3/4" high-density particle board, skinned with galvanized steel on 
> both sides, maybe 28ga. Very flat, and very smooth. It will bow just a 
> little, maybe 1/2 inch at the most, when you pick it up from the end. 
> Came in 4' x 12' as I recall. Don't have any idea where you could 
> purchase it at a reasonable cost. I was hoping they would have a sheet 
> of it leftover when they built one of the chambers where I used to 
> work, but they didn't.
>  
> Bob Richards.
>
>
> John Ferrell <johnferrell at earthlink.net> wrote:
>
>     The test for a Pool Table is to put a straight edge across it and
>     try to slide a dollar bill under it.
>      
>     BTW, I am surprised to hear the talk about using pins. One of the
>     first things Dave Guerin taught me was to use masking tape instead!
>      
>     John Ferrell  
>     My Competition is not my enemy!
>     http://DixieNC.US <http://dixienc.us/>
>
>         ----- Original Message -----
>         From: Mark Grabowski <mailto:MGrabowski at fmtinv.com>
>         To: 'discussion at nsrca.org' <mailto:%27discussion at nsrca.org%27>
>         Sent: Friday, November 19, 2004 11:21 AM
>         Subject: Measuring Surface Flatness (was "Cabinet Grade
>         Particle Board")
>
>         We've seen some great ideas from several folks. However, a
>         common element to this discussion is that you need to measure
>         how flat the surface winds up. What tricks are you guys using
>         to actually measure how flat the surface is of the bench you
>         just built?
>
>
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