[meteorite-list] RE: RE: Polishing slices?

[Christian Anger]

Disagreement !

I also lay the sanding papers on a flat glass which has the same effect of
producing a flat surface on the sample. I do not have rounded edges on my
specimens.
Also it is wrong to move the face of the probe in circles.
You have to describe an "8" when moving the sample across the grains or
paper - that's the real polishing technique.

I also do NOT produce scratches. You have to take care not to withdraw
grinding material from the coarser grinding papers to the next lower
grinding grain size paper. Keep your sanding papers clean. Store every
sanding paper extra, be careful and make the job with patience and love.

I do not have the difficulties what Marcin is talking about.
And diamond powders or pastes are expensive too.

The technique I use only takes time. I own years of experience in polishing
by using sanding paper and I also use it DRY - without any fluid (water,
alcohol etc...) - I think nobody expected this - but that's my experience
and it works - works very well and I have best results - without any
scratches. You just have to learn it. Experience is all.

It is a lot of work, for sure, but this belongs to curating a collection
too, for me, at least.

Cheers and good night,

Christian


IMCA #2673
www.austromet.com
 
Christian Anger
Korngasse 6
2405 Bad Deutsch-Altenburg
AUSTRIA
 
email: christian.anger at aon.at

-----Original Message-----
From: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of
Meteoryt.net
Sent: Tuesday, March 08, 2005 12:26 AM
To: meteorite-list at meteoritecentral.com
Subject: Re: [meteorite-list] RE: Polishing slices?

> I polish all my meteorite slices, endcuts, windowed meteorites  with
sanding
> paper by hand.
> I begin at 80 grit and then polish
> with 120,220,400,800,1000,1500,2000,3000 grit sanding paper.

I want suggest different technology.
Sanding paper produce rouded edges on sanded surface, cost is high and
durrability low.
Better is to buy sanding/grinding powders.
First You must buy normall piece of window glass as big as You like. Then
You put in some powder and a few drops of water/alkohol/oil. But the best is
water (alkohol disapear too fast, oil is ok only for iron meteorites). And
then You move Your slice on surface making small circles on all glass
surface. This is much FASTER than sanding paper and every new portion of
powder that You can add is sharp, like new page of sanding paper. This
technology make ideal flat durface. And what is inportand, grinded surface
is perfect mat/dull. No scratches like from sanding paper.
But after 1000-1200 grid powder it still need a finish polishing usng
diamond powders or other high grade polishing powders to make a mirror
polishing.

grid
 220 is good for remove saw marks
400 for remove scratches from grid 220
then You can jump to 800 and finish on 1000 or 1200


-----[ MARCIN CIMALA ]-----[ I.M.C.A.#3667 ]-----
http://www.Meteoryt.net             marcin at meteoryt.net
http://www.PolandMET.com       marcin at polandmet.com
http://www.Gao-Guenie.com      GSM +48(607)535 195
--------[ Member of Polish Meteoritical Society ]--------

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