On 06/08/2012 11:39, dennis@home wrote:


"ss" wrote in message
...

I dont use chisels much, so much so that over the years I didnt
realise how bad they had become, also the stone was hollowed out. What
I did for a quick improvement was use a piece of flat pack wood and
glued a few grades of wet & dry to it. Not perfect but a vast
improvement on my chisels, now looking for a piece of plate glass. I
use the eclipse guide, its ok for me as I am not sharpening chisels
every day.

Plate glass is not float glass and may vary in flatness.
You can always grind it flat if you want.
Its easy to do but you need three pieces and you grind each one against
the others in a sequence that makes all three flat.
Its how you make optical flats for telescopes.

It used to be how you made engineers flats except you used a dye marker
to indicate high areas and scrapers to actually remove the material.

I keep a chunk of yorkstone on the bench. Fine enough for my
requirements, and heavy enough to stand still.