The Woodcraft here in Palatine, IL is carrying a new granite surface plate.
It's 2" x 9" x 12" and goes for $30. It's specified flat to 0.0001". I
don't know if $30 is a good price since I've never priced one, but it seemed
interesting. Just an FYI. I also see they have it on their web site.
Dunno if it's a good price either, and I don't know how hard it is to come
by stuff flat to 0.0001"
I'm gearing up for Scarey Sharp, and I'm using a lot of chunks of what I
think are granite counter backstop. Happens to be the right width for
pre-cut 1/3 sheet sandpaper. It's as flat as my straight edge, however
flat that is, and it was free. Dumpster behind a custom stone counter
place. They throw away about four cubic feet of this stuff every day.
I'm heading that way tomorrow, to see if I can get enough chunks that I can
have one dedicated chunk for each grit.
Want some? :)
Michael McIntyre ---- Silvan < email@example.com>
Linux fanatic, and certified Geek; registered Linux user #243621
i consult for a granite and marble place here in MI. i strongly suggest
you walk into a local facility that does stone countertop fabrication
and ask for a scrap before you pay for a piece of stone.
our company pays $150 per day to discard tons of large, flat "scrap"
pieces. so much material, in fact, that i am seriously considering
building a large router table out of 2 1/4" thick granite.
Nowhere close. It may not matter though. Depends on what you are doing with
it Are you using this as a measuring standard? If so, go with surface plate.
Are you using this for sharpening? if so, go with the cheap stuff.
If you take two plates, spread some rubbing/polishing compound between them
and slide one over the other, they'll polish out to flat (or spherical, one or
other). By working with successively finer compounds, you'll be able to get
any degree of flatness and smoothness you want. Trade off cost vs work.
Pardon the newbie question, but what are the main uses/benefits of a granite
The size of plate you are talking about in this thread seems too small to
lap planes. All the scary sharp fans seem to go for a large piece of glass
as backing for the sandpaper. I googled granite reference plates and see
there are many sizes and "grades", but not much about the main uses a
woodworker would make out of having one. Any feedback is appreciated. I have
already learned LOTS by lurking on this NG for a few months. Regards,
Judging by the reflections on those surfaces they are just a couple of
granite slabs - the type that you would use for a countertop. Not the type
that is flat to the 1/1000". Still they are rather flat.
Even better, judging by the thickness, or lack thereof, they are definitely
*not* surface plates.
Those suckers are *thick*, like 3 or 4 inches for small surface plate.
Still, really nice pieces of granite, and a nice shop, to boot.
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