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| Truing up water stones http://w-ww.luthiersforum.com/forum/viewtopic.php?f=10102&t=4841 |
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| Author: | Brock Poling [ Tue Jan 31, 2006 6:03 am ] |
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The sharpening article got me thinking. Someone once gave me a used japanese 8000 grit water stone. It is all gouged up on both sides from blades digging in. Does anyone have a resource or a methodology for fixing these and truing them up? Both sides have the same problem but the stone is virtually new I can still see the writing on it. |
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| Author: | dgalas [ Tue Jan 31, 2006 6:08 am ] |
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From bottom up: glass, water, 220 wet dry sandpaper, water, stone. The water on top of the glass will help the paper adhere and lay flat. The water on top of the paper acts as a lubricant. Cheap any easy - albeit messy. You can also use a diamond stone if you have one - expensive, easy, and messy. 
Cheers, -Dave |
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| Author: | Wayne Clark [ Tue Jan 31, 2006 6:10 am ] |
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I use 600 grit wet/dry on a flat surface. Flood the paper with water and scrub away. |
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| Author: | Chas Freeborn [ Tue Jan 31, 2006 6:23 am ] |
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Don't make so much work for youself- use 80 grit wet or dry and a thick (3/8" or so) piece of glass. You're not sharpening the stone, you're flattening it. I'll rub the stones on each other for touch up. The high areas around the edges grind on each other and put it back to flat. -C |
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| Author: | Bob Steidl [ Tue Jan 31, 2006 6:26 am ] |
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Nice stone, lucky you. If one of mine is in bad shape, I start with my 6 x 48 belt sander to get close, then switch over to a flat surface as suggested above. |
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| Author: | RussellR [ Tue Jan 31, 2006 7:02 am ] |
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Hi Brock There is a special stone they produce for refacing waterstones, its called a Nagura stone I would use an abrasive to level and then redress with a Nagura stone, this will ensure there is no traces of your abrasive left behind and removes any glaze from the stone. |
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| Author: | Todd Rose [ Tue Jan 31, 2006 7:33 am ] |
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I like the idea of starting on the belt sander if the stone is really in rough shape. I do mine on sandpaper (as Chas said, fairly coarse sandpaper is fine - is that an oxymoron?) on glass, since I'm already set up for that. I stick several 1/2 sheets of wet/dry sandpaper of various grits to a large piece of thick plate glass (which is on a dedicated table next to my sink) with spray adhesive. They come off pretty easily with alcohol and a little razor blade scraper. I don't use the nagura stone, but that may be foolish on my part. If you aren't set up with the glass, you could use another dead flat surface, such as table saw or whatever. You might want to check with a straight edge to see if it's really dead flat. |
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| Author: | Todd Rose [ Tue Jan 31, 2006 7:34 am ] |
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or just run it over your jointer 
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| Author: | RussellR [ Tue Jan 31, 2006 7:50 am ] |
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Todd The reason I said about using the Nagura Stone on this one is because it is an 8000 Grit Stone on a coarser stone not neccasary as long as the abrasive used is a finer grit than the stone, otherwise you risk particle contamination, effectively making the stone coarser than you want it to be. |
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| Author: | Dave-SKG [ Tue Jan 31, 2006 7:57 am ] |
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Brock the way I do it is to put some 90x Lapping grit on a Lee Valley lapping glass plate. it is perfectly flat. you add a little water and start rubbing. When the tone changes the stone is flat so flat that you can pick the plate up with the stone stuck to it. since there is no hollow or other imperfection the stone will not release the plate. Takes about 30 -60 seconds. all supplies from Lee Valley. |
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| Author: | dgalas [ Tue Jan 31, 2006 8:03 am ] |
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[QUOTE=Todd Rose] or just run it over your jointer [/QUOTE]
That is, believe it or not, in the older Powermatic jointer manuals as a way for honing knives! 
Stop block on the infeed, lap from the outfeed side, back and forth, with the jointer RUNNING! No thanks, not for this chickens**t!!! |
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| Author: | Shane Neifer [ Tue Jan 31, 2006 8:34 am ] |
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I'm with Mr. Bland, the Lee Valley grit and glass. Except, because I sharpen at 90 degrees off of what most others do, that is the long edge of the chisel paralell with the long edge of the stone, an unflat stone is not really an issue to me so I seldom true them up until they get really bad. That is the down side of water stones, they are very soft and do gouge easily. Shane |
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| Author: | crazymanmichael [ Tue Jan 31, 2006 10:06 am ] |
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a nagura stone is not for leveling, but rather for getting the messy slurry started on fine finish stones before you put a blade to it. |
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| Author: | RussellR [ Tue Jan 31, 2006 10:10 am ] |
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Michael it has two applications the one you mention, and it is also good for lifting contaminates and glaze after you have levelled your stone. |
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| Author: | Brock Poling [ Tue Jan 31, 2006 12:33 pm ] |
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Thanks guys. Great info. This seems easier than I thought. |
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| Author: | Roy O [ Wed Feb 01, 2006 2:42 am ] |
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I know an old time wood worker here that runs them through his thickness sander when they need leveling. |
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| Author: | Rob Girdis [ Wed Feb 01, 2006 4:41 am ] |
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Brock, A granite surface plate is a really good investment for this purpose. Mine is 12"X18". (I believe Grizzly carries them). I think it is as important as having a good reference straight edge. For use, a piece of PSA sandpaper of your favorite grit adhered to the plate provides a flat surface to lap the DRY stone over. You can see your progress easily. I originally got mine to true up my planes, but it is perfect for the water stones as well. Not as effective on ceramic stones though. You'll find other uses for the plate once you have one. |
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| Author: | Don Williams [ Wed Feb 01, 2006 4:52 am ] |
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[QUOTE=dgalas] [QUOTE=Todd Rose] or just run it over your jointer [/QUOTE]
That is, believe it or not, in the older Powermatic jointer manuals as a way for honing knives!
Stop block on the infeed, lap from the outfeed side, back and forth, with the jointer RUNNING! No thanks, not for this chickens**t!!![/QUOTE] We saw a demonstration of this technique a few months ago at an NEL meeting. It was scary as heck to see it being done, but it worked fabulously for sharpening the jointer knives, as well as getting them all at the same height. It was quite astonishing. But still, not this guy either! |
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