Hello,
I have been reading the discussion threads for a while, and now I have a question that I would like answered and I can think of no better place to ask.
I recently found an old Stanley chisel at a antique store. I think it is a 720 or 750, I can’t seem to find a consistant website on the model number. However, that is not my question. Although it is about 5 1/4 inches long from the edge to the end of the socket. Its missing the handle, but I should be able to find on somewhere.
On the newer chisels that I have the sharpening angle is 25 degrees. When I went to sharpen the old stanley, and also my fathers old stanley chisels , it looks like the angle is 30 degrees. I didn’t sharpen them at all because I didnt want to put the wrong angle on them.
So, should I sharpen the old chiseld to 30 degrees, or has someone put the wrong angle on them. My fathers chisels have been used a lot, and it looks as though he didnt keep them very sharp, or use a consistant angle on them. So I can see his chisels having the wrong angle on them, but the old Stanley that I found leads me to believe that maybe 30 degrees is the correct angle for old Stanley’s.
Any information would be greatly appreciated. And if anyone can lead me to an identification and maybe a replacement handle, that would be great also.
Replies
There is no "correct" angle for a chisel. The choice of the angle is always a compromise between ease of cutting (a shallower angle) and resistance to wear and chipping (a wider angle), and is also dependent on how the chisel will be used. Light paring cuts in a softwood are best done with a shallow angle, but chopping mortises in oak would require a wider angle to maintain the edge for a reasonable amount of time. The quality of the steel in the blade also makes a difference, top quality steels properly hardened and tempered allow you to use a shallower angle.
It is likely that the Stanley chisels were meant for rougher work and were factory sharpened to a 30 degree angle to make for a rugged edge. If you intend to use the chisels primarily for bench work without heavy chopping you can safely grind them to 25 degrees. I do a lot of work in pine and have some chisels with an even shallower angle.
John White
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