Weird sharpening stones phenomenon
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- This topic has 3 replies, 3 voices, and was last updated 5 years, 4 months ago by Andrew Sinclair.
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While I was trying to flatten and prep my #7 plane iron (aftermarket Everkeen iron), I experienced something that I can’t make sense of. I flattened on 400 grit sand paper and took note of the hollow in the center of the back. The edge had polished, so I moved on to 1000 grit water stone. That polished as expected. But then when I switched to my 3000 grit stone, it started to polish from the center — where the hollow was. It took forever to try and polish to the edge as it moved from the center out. Finally, I went to the 6000 stone (opposite side of the 1000), but it began to polish from the outside in again. It took forever to get the edge of the iron polished, because it had presumably became bellied rather than hollow. I repeatedly checked my stones for flatness and made sure I was working on each stone the same way. Any ideas why the iron seemed to invert between stones? It is a pretty hefty iron, so I don’t think flex played into it. I already bounced between stones to make sure I wasn’t crazy.
I’m not doubting that:
The iron is flat with a slight hollow in the center.
It will not flex.
The stones, like you say are flat.
Could one of the water stones flex but the other ones does not?Seems to me that either flat or flex has to be causing the problem.
I suppose it’s possible; it just seems odd and unusual. The stone is on a 3/4 sheet of plywood (same base as the other). It was a pain in the neck to get that blade sharp because it seemingly hollowed out the middle before the final stone. Maybe I’ll just skip the problem stone in the future?
25 December 2018 at 7:31 am #554098One possibility is the problem stone is more abrasive in one region?
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