: The current FWW issue has an article about sharpening and lapping on a
: granite plate using silicon carbide powder. My question is if doing this
: method of sharpening on granite (or plate glass), does the abrasive
: significantly change the flatness of the substrate (granite or glass)?
: a sharpening stone, do you lose the flatness...the most important feature?
I use chromium polishing paste on glass - please see my web site -
Sharpening Notes - Some Scientific Light On Sharpening Technique' .
The surface of the glass is somewhat degraded of course, but I haven't
noticed significant wear. However carbide powder might be much coarser,
hence some wear is inevitable.
When using fairly coarse carbide grains on glass for flattening plane soles,
I've found that the scratches act rather like glass cutter scratches and
make the glass rather more fragile than usual.
: If not, why?
Until the surface of the glass is fragmented by numerous scratches, the
surface will not be attacked in the same way as an edge does to a stone. Ie
the steel is not trying to tear the grains from the supporting matrix.
Well, that's a theory anyway!
Jeff Gorman, West Yorkshire, UK
Email address is username@ISP
username is amgron
ISP is clara.co.uk