I have a question about finishing jewelry pieces. I usually end up
using different types of abrasives for different parts of a piece.
Maybe a sanding stick for flat, open areas, abrasive sponge or maybe
bristle disc or something else for a hard to reach area, and so on.
If I could just use one abrasive method to cover the entire piece,
for example, graded sanding papers, there would be no problem. That
doesn’t always seem practical. When I switch from one method to
another, I’m never sure how they match up as far as abrasive grit.
How does a “fine” 3m sanding sponge compare to a 440 bristle disc?
How does that compare to my “medium” Moore’s disc? Did i just move
backwards from a fine to a more coarse grit? Some abrasives, like
sandpaper, usually have a grit or micron size specified, but I’m not
even sure if they are really equivalent between different brands, and
many abrasives are not specified that way (just “coarse”, “fine”,
I don’t know if there is a solution to this, but as a scientist-type,
I wonder if there is some way to test these to at least rank them in
some way, as to equivalent abrasive level (grit?). I was wondering
about some sort of scratch test. Is there such a thing, or some other
technique to shed light on this?