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Contamination in Shapton Stone???

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Forum topic by yvrdennis posted 11-18-2016 05:00 PM 396 views 0 times favorited 3 replies Add to Favorites Watch
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yvrdennis

34 posts in 912 days


11-18-2016 05:00 PM

I have been wrestling with a sharpening problem for a long time now. All of my chisels and irons have nasty looking scratches on the back. I’m using Shapton water stones. I polish the backs up to 5000 grit and they look fine. Then I do a final polish on my 8000 grit stone and I see all of these scratches. I originally thought that they were scratches from the 5000 grit that I hadn’t polished out yet, but I can work my 8000 grit all day and they don’t go away. Also, I have tried polishing in different directions on the different stones and the scratch pattern seems to match the 8000 grit direction.

I’m starting to wonder if I have some kind of contamination in my 8000 grit stone. I can’t see or feel anything, but I can’t think what else it could be. Has anyone else run into this, or do you have any idea what else it could be?

Thanks,
Dennis


3 replies so far

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Bill White

4802 posts in 3795 days


#1 posted 11-18-2016 05:07 PM

Have ya lapped the stones between use to insure the surface?
Bill

-- bill@magraphics.us

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yvrdennis

34 posts in 912 days


#2 posted 11-18-2016 05:47 PM



Have ya lapped the stones between use to insure the surface?
Bill

- Bill White

Yes, I lap them on a diamond stone.

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Tim

3680 posts in 1796 days


#3 posted 11-19-2016 03:22 PM

Then yes, it seems very possible that you got some grit contamination from a higher grit stone or from the diamond stone. Diamonds are harder than other materials but the bonding agent that holds them on the surface can fail. They’re bonded with nickel I think.

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