From:
B B <blb@xxxxxxxxxxxxxx>
Date:
Thu, 6 Mar 2003 14:40:45 -0800
Subject:
Polishing basalt, granite
I think it is unusual to leave traces like you describe. Get different
pads, use them with a centerfeed water grinder/polisher. Normally
basalt and granite are virtually free of surface pores, so I am not
sure of what your problem is unless you are not using water and are
overheating the resin pad so that it leaves melted material. Also
polishing is done at only 3 or 4 thousand rpm, not 10,000 rpm that a
saw uses. You can use silicone carbide sanding disks, wet or dry to
polish, but diamond has such better abrasive power, you are better off
with the resin pads. There are lots of tricks for polishing that others
may be able to offer, but these basics may help.
Most diamond pads when used with water have very good bite. Normally
you would use from 50 grit to several thousand grit for smoothing to
polishing. Double the grid as you go up. If you want more grinding
ability, say 30 or coarser grit, you need to use silicon carbide
grinding wheels or diamond cup wheels for the igneous stone you are
working with.
regards,
Bill
- References
- message 00401: Polishing basalt, granite - Kaaron (06 Mar 2003)
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