I am flatening the back of chisels with some Japanese water stones. They don’t seem to be polishing, instead they are getting a dull matte finish. I started with 120, 220 and 400 grit silicon carbide paper and glass then I went to 800, 1000 and 6000 grit stones. I used to get a mirror polish, what am I dong wrong? I have flattened the stones on silicon carbide paper and glass.
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Replies
Ray,
Are they sharp enough to slice the end grain of a pine board?
Dano
yes
Ray,
It could be the stones are leaving residue on the chisel - I sometimes get that when I use buffing compounds. As long as they are sharp, I wouldn't worry about it.
Jeff
Are you sure you didn't contaminate the finer stones with the silicon carbide grit slurry? Did the change occur right after you flattened them? Or did you flatten them to correct the problem? You can cross contaminate the stones if you don't clean the tool real well in-between stones. Are the stone surfaces clean?
Edward
I flatened them to try to correct the problem. I rinsed the silcon carbide paper, but perhaps not very well. Assuming that is the problem what do you suggest I do to correct the problem? Should I reflaten the stones? Ant ideas?
Thanks for the suggestion.
I've never used sandpaper for sharpening although I have read articles about it. What grits do you use? I've been pleased with the waterstaones because they cut so fast. You just need to keep them flat.
60, 100, 120 on the rough side of my glass and 150, 180, 220, 320, 400, 600, 800, 1500, 2000 on the other. I only use the rough side for new or badly chipped blades. I run through each grit for 30 seconds using a Veritas honing guide. I touch-up a 2 degree micro bevel at 1500 and 2000. BTW I use it dry and use compressed air between grits. John O'Connell - JKO Handcrafted Woodworking
Life is tough. It's tougher if you're stupid - John Wayne
Steve, as a matter of possible interest to you, I just ordered a video called "Sandpaper Sharpening" by Michael Dunbar from Taunton Press. You can find it by doing a search on the Home page. The cost is 11.95 and the promotional copy says you can use five grits to get a razor sharp edge.
Bill
Hi Ray,
I also used Japanese water stones and also have tried the sandpaper or "Scary Sharp" methods....until I discovered the two-sided DMT diamond stones....the best IMHO! You don't have to flatten them, they don't wear out and they don't require soaking in water..and subsequently don't freeze in the winter. I'm a huge fan of sharpening my chisels EVERY time I use them. That way, once I get them sharp, it just takes 20-30 seconds of "touch up" to keep them sharp. The planes don't get the same treatment....takes too long.
With both methods, however, I've found that you need to strop the chisel in order to get that shiny finish we all love.
Don't bother buying a strop from a catalogue or whatever... Find a piece of leather, glue it to a flat piece of maple or other reasonably hard wood and get some green polishing compound....Lee Valley and most others sell it.
After you've got the chisels sharp and you can feel the burr, strop each side of the chisel 20 times (per side with green compound). You'll find it cuts a tiny bit better and also has that nice shiny finish.
Good luck!
lp
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