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Thread: Corner Chisels
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1st February 2006, 10:14 PM #1
Corner Chisels
I have a question for all those afficionado's of the "reputed" dark side..one that I feel has'nt posed itself before.
How is the bevel ground on a corner chisel happenstance it should need it?
It's not that I have a need to re-grind the bevel, but the thought came to mind as I was re-lapping the backs on my waterdtones.
I have both the Robert Sorby and the Crown corner mortise chisel's and I think that the crown does'nt hold an edge as good as the Robert Sorby.
However I would be interested in your views.
CheersJohnno
Everyone has a photographic memory, some just don't have film.
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1st February 2006, 11:43 PM #2
I don't have one yet, but a half-forgotten sharpening book that I read claimed that since they were only for very ocassional use, they weren't hardened to the extent of a regular chisel, and hence were sharpened with files.
I have always wondered if that was true.
Greg
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2nd February 2006, 08:58 AM #3
Well as I have Leonard Lee's sharpening book in my desk drawer at work (it's a library book that I have to return by tomorrow ) I looked it up for you. The description covers most of the page but in essence it's what GregoryG says.
You use a safe edge mill file to file the bevel as the chisel steel is fairly soft (he says never harder than RC58).
He recommends a bevel angle of 30 degrees for softwood anf 35 degrees for hardwood.
Like I said though there's about a page of info on the subject.
The Complete Book of Sharpening pp 72.
Craig (who must buy his own copy of the sharpening bible )
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2nd February 2006, 07:20 PM #4
Thanks for those responses,it was something that intrigued me and I had'nt seen a reference to it ...but now the light is clear.
CheersJohnno
Everyone has a photographic memory, some just don't have film.
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3rd February 2006, 12:01 PM #5
From memory, Lee basically says that they are a sharpening nightmare and one shouldn't be too worried about gettign them smooth, just reasonably sharp.
After totally stuffing up my attempt to square off some routed mortises, I'm thinking of a corner chisel too.......Cheers,
Adam
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3rd February 2006, 07:48 PM #6
Thanks guys!
I have a couple of R. Sorby corner chisels (1/4" and 5/8"), and have used them from time to time - but have been wondering "how the devil can I sharpen these"...) along the edge of a waterstone, and in so doing irretrieveably leave a rebate on the stone :eek: ? or with a file or even a diamond "stick".
Cheers!
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3rd February 2006, 07:51 PM #7
Just make sure that you 'safe' the file by grinding the teeth off the edge, like an auger bit file.
Greg
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4th February 2006, 01:43 AM #8
Corner chisels are really tricky to hone.
I have just one, a 1/4" Japanese laminated type. What you quickly learn is that you only use a corner chisel to pare, and not to pry the waste away - otherwise they chip. Mine did, and I had to grind the sides back and start from scratch.
I made some files out of sandpaper glued to hardwood, 80 grit upward. This was done with the chisel clamped in a vise, and taking the sandpaper files to the chisel. I didn't get too fussed with the angle of the bevel - could be anything between 25 - 35 degrees. Finished with a diamond plate, again taken to the chisel rather than the other way around.
Regards from Perth
Derek
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