Jack Lord's Discussions

Started this discussion. Last reply by Jack Lord Nov 21.

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At 7:57am on September 28, 2008, Russell Vance said…: Hello Jack, thanks for your interest - a toothing iron looks like a rough cut file with the end ground off to reveal the tooth set - sort of a jagged edge appearance. This edge is pushed along the smooth grain of the surface to be roughened and digs in to roughen the surface with a lot of small 'v' cuts - surfaces that have been toothed look like a lot of small stirations running along the grain.
Keying the surface refers to this kind of mechanical scouring of a surface - it can be done with rough sandpaper or toothing and basically scratches the surface of the wood to allow a glue to get a better grip for a mechanical bond. A standard practice on wood such as ebony and rosewood is to then wipe the surface with acetone to remove extractives (minerals and chemicals in the wood which resist glue action) and impurities. Allow the acetone to gas off and glue it up. Hope this helps, Rusty.

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