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Ken
 
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Default Shapton: Sharp vs Shiny

I've been flattening the backs of some chisels using
the following stones:
Norton Waterstone 220 grit
Norton Waterstone 1000 grit
Norton Waterstone 4000 grit
Shapton Professional Waterstone 8000 grit

After the Norton 4000, the chisel back is perfectly flat
and rather polished. Though I can still see scratches
by eye and with magnification, the surface is shiny and
mirror-like.

After the Shapton 8000, the surface is less shiny,
less mirror-like. The scratches seem to be finer than they
were after the 4000 Norton, but the surface is more
of a satin finish and not mirror shiny.

Just wondering what's going on here.

Thanks, Ken

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Vijay Kumar
 
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Ken wrote:
I've been flattening the backs of some chisels using
the following stones:
Norton Waterstone 220 grit
Norton Waterstone 1000 grit
Norton Waterstone 4000 grit
Shapton Professional Waterstone 8000 grit

After the Norton 4000, the chisel back is perfectly flat
and rather polished. Though I can still see scratches
by eye and with magnification, the surface is shiny and
mirror-like.

After the Shapton 8000, the surface is less shiny,
less mirror-like. The scratches seem to be finer than they
were after the 4000 Norton, but the surface is more
of a satin finish and not mirror shiny.

Just wondering what's going on here.

Thanks, Ken

Dont know how Shaptons supposed to be used. For a normal waterstone
6000x or greater, you are supposed to use a Nagura stone and create a
slurry on the waterstone surface before using it. Mirror shine guaranteed.
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woodworker88
 
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No offense, but what is a Nagura stone? Is it some form of polishing
compound like rottenstone?

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stoutman
 
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http://japanwoodworker.com/page.asp?content_id=2817




"woodworker88" wrote in message
oups.com...
No offense, but what is a Nagura stone? Is it some form of polishing
compound like rottenstone?



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Bob in Oregon
 
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Not sure what its made of but it is a white natural stone that will not
only help build up a slurry, but will also "deglaze" the surface of the
stone- taking off the stubborn metal redidue left behind to clean the
stone off. you should use it several times during a sharpening.

It is possible that you are using too much water on the 8000. Dont soak
it, and just squirt a little water on, then use the naugura stone to
build up a slightly wet paste. Add just a drip of water when it gets
dry. Use the nagura stone and rinse with water again when the stone
turns grey from the metal. It should only take a few strokes, maybe
half dozen to make an almost perfectly mirrored surface-- when you hear
the blade squeak across the stone- its done. You should be able to see
your nose hairs.



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George
 
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"Ken" wrote in message
oups.com...
I've been flattening the backs of some chisels using
the following stones:
Norton Waterstone 220 grit
Norton Waterstone 1000 grit
Norton Waterstone 4000 grit
Shapton Professional Waterstone 8000 grit

After the Norton 4000, the chisel back is perfectly flat
and rather polished. Though I can still see scratches
by eye and with magnification, the surface is shiny and
mirror-like.

After the Shapton 8000, the surface is less shiny,
less mirror-like. The scratches seem to be finer than they
were after the 4000 Norton, but the surface is more
of a satin finish and not mirror shiny.

Just wondering what's going on here.


The scratches on the Norton are from the previous grit? Seems a truth in
sanding.

Shapton's sharper. Duller stones make shinier surfaces.


  #7   Report Post  
J
 
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"woodworker88" wrote in message
oups.com...
No offense, but what is a Nagura stone? Is it some form of polishing
compound like rottenstone?


Yep. But more like chalk. Very fine.

-j


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arw01
 
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Shapton does not require a nagura. Very little water, just enough to
wash away the abraded particles. My one chisels are shinny enough to
count pores when done with the 5000, let alone the 8000.

I suspect an improper technique. Personal experience with the Shaptons
vs scary sharp is Shapton is much sharper at 8000 vs SS 2000 which is
quite comparable.

Alan

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