Can I use a glass shelf as a flat surface?

G

Grapevine

Joined
Mar 5, 2002
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I'll attempt to put scales on various naked blades like the Spyderco Mule and a few others, all with hand tools. I've read where makers use thick machined granite slabs for their flat truing surface. The cost + shipping something like that to me is a bit more than I'd like to spend at my stage of dabbling. Ikea sells a 3/8" thick 11" x 13" glass shelf for $10. Do you think something like that would be within tolerances compared to the machined granite slab?
 
Does anyone use scrap pieces from a granite counter top place ?
 
While a granite surface plate is nice, and only about $20, a heavy piece of glass will work.
Other things that work for the tolerances we need are -
Scrap granite counter top
Corian counter scraps
Laminated counter scraps
Sheet of flat steel.
Woodcraft Supply , MSC, and many others sell the granite surface plates. Sometimes you can get free shipping.
 
Polished granite is pretty flat - the local granite countertop places cut out the holes for the sink after polishing, so they're (A) pretty flat and (B) scarp.
 
Usually only 12 x 12" but Home depot and Cost Less Carpet sells granite plates used for flooring pretty cheap too.
 
-and the scrap pile at a gravestone marker dealer.

Often the same makers do gravestones, and granite countertop work.
The kitchen sink cutouts are nice pieces.
 
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