I was trying to think up a method to directly compare the
Well Todd, the problem is that abrasives are much more complex than
that. You can Google abrasives and find volumes written about them,
if you are so inclined. I think the effort in question is less than
worth the effort myself, but whatever floats yer boat…
I’mnot an abrasives expert, but there are some things in play that
everyone should know anyway. First factor is “aggression” - how
sharp and how tough the abrasive is. Silicon carbide or carborundum
is maybe the most aggressive abrasive out there. Next is probably
aluminum oxide, which is emery among other things. Diamond is hard
and sharp but lessaggressive, surprisingly. Now, andybody who knows
more about abrasive than I do is welcome to correct me or embellish,
because I’m not an expert, as I said.
What that means is that you get a sheet of carborundum sandpaper and
stroke it across a sheet of metal. The grit cuts deeply and quickly
and most importantly the crystals largely stay intact. Then you
stroke it again and it’s roughly the same as the first stroke - it
cuts deeply and quickly. Do the same thing with aluminum oxide -of
the same grit - and it’s nowhere near as sharp or tough. It cuts
less on the first stroke, and many of the crystals break, leaving a
softer edge. So the second stroke is only 90% (whatever) of the cut
of thefirst stroke. As you keep sanding the sandpaper gets "softer"
and you actually almost end up with a finer grit sandpaper in the
end. Almost, not really. Diamond has it’s own properties - the
diamond crystals cleave easily, but when they do they expose fresh,
sharp edges, not soft ones. So it’s not just a matter of comparing
grit sizes, youalso need to factor in WHAT the abrasive is - it’s
not all about grit size.
Then you have the backing material and the glue used to bond the
grit to it and you get into pretty much infinite possibilities.
Andthat’s just sandpaper, it’s not even getting into wheels and
Whole books have been written about this stuff, as you’d expect.