I’m practicing making cabs using agate on a Inland Lapidary Swaptop
series, and I have a question about the hand cabbing process on a
stone mounted on a dowel with dop wax.
I usually start using my 175 grit wheel. Typically after grinding
the edge, I start the bevel at 45 degrees and grind the stone while
twirling, gradually increasing the angle toward the center of the
stone until only a third of the top of the stone remains.
Then, after cleaning my equipment and my stone thoroughly, I’ll
switch to 325 grit. I’ll do a fast twirl from the edge to the nearly
the top of the stone. I’ll then start rocking the stone from edge to
center to edge, twirling as I go, to round the top.
When I look at what I just did under 10X magnification, however, I
see a bunch of lines, so I’ll do another twirl from edge to top. This
breaks up the lines into what appear facets roughly evenly coating
the stone like a compound eye from a bee or fly.
I repeat this at my next disk, which is 600 grit, and the result
from this is that the stone is now covered by a whole bunch more
The book (P. Downing) seems to say that I have to be able to
completely get rid of all scratches, pits, and lines for each grit as
seen under 10X magnification, before I dare go to the next grit.
But I don’t see how I am able to do that, because when I try to work
on the pits, they just get bigger and cover the stone far more
Just what am I suppose to be doing?
Thanks in advance,
Andrew Jonathan Fine