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

[Bob Richards]

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

----- Original Message ----- 
From: Mark Grabowski 
To: 'discussion at nsrca.org' 
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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