Eish, Eish, Jeff, That has got to be the most beautiful agate I have
ever seen. I could do some things with that! Is that a one off or is
there more available?
Best advice I could give is to use wooden dowel sticks, charged with
the appropriate cutting compound 1200 grit, 14000 50,000 etc.
You buy the round dowel sticks at the hardware store.Cut them into
’polony’ slices of various lengths.
Drill a hole into the center and glue a shaft into the ‘more or less
center’. Then you put the shaft into your hanging motor or drill
press and true it up using a file or graver so they run smooth. You
’lathe’ it to the required shape That why I said more or less
Then you take the appropriate diamond grit and mix it with olive
oil, WD 40 or butter or axle grease, for that matter, and you smear
the compound on the prepared wood piece…You recharge the wood as you
go along. I use 220, 1200 and 50000 as I remove prior scratches.
Also, I cut strips of the appropriate wet or dry sand paper ( the
black corundum stuff) and with my sanding mandrill, ( hanging motor)
I dip it into a bowl of water and sand my piece down. I know, it
sprays water every where but it works very well, until I get to the
’wooden’ stage of polishing. So I would wet the sanding mandrill,l
then work the stone piece for a little while, then tear the worn
piece of sandpaper off and wet it again and continue. If you use
Carborundum 1200 without water, it starts to polish the stone. This
you want to avoid. It causes an uneven surface when the final
polishing stage is reached. I use this method mostly with 220 and
1200 grit. I spray the hand piece with WD 40 to stop rust.
Indeed, if I have a large piece of quartz, say + 50mm, and I want to
finish a smooth curve, I take cotton cloth ( like an old teeshirt),
cut it into strips and impregnate it with the right grit,( that is,
smear it with my grease and compound) put it in my drill press in a
large split mandrill, ( 6mm thick, cut with a small hacksaw down the
center), set the speed to about 300rpm It is a bit bumpy at first,
it mellows in a short time.
If you have done the early grinding carefully the prepolish feels
very sensual.Smooth and satin like, but not glossy. LOOK with an
Optivisor carefully for deeper scratches Trying to polish a badly
prepared surface is a schlep and wastes time.
One thing to watch out for is that if you use a very course grit at
first, it is more likely to make finishing off more difficult.After a
Mizzy heatless wheel, or a green grinding wheel, I go to 220 grit,
and I spent a long time there.I go over and over the surface,
checking with a loupe to see that every last grinding wheel mark is
gone— Ergo, a finer grit takes more time, but it easier to get to a
high polish in a shorter time.And polishing always takes the longest
I purchase diamond powder at Crystalite, but there are many other
suppliers. A bit rambling, I know, but if you need any pictures, you
Cheers Hans Meevis