How to find out about the edge angle on a blade?

Hey QS-

WHat do you want to know? The angle of an egde on a knife youhave?

Or what angle you should sharpen most knives at?

For the former question, you can spark plug gappers os even stiff paper... form a "v" with them and put you blade in the v. Close the v till the edges are flush with edge bevel. Pull your tool away and lay it down on paper, trace it or just use a protractor to fins your angle. I'm sure SOMEWHERE there is an actual tool for this...

Best of luck...

;)
 
Sounds a bit complicated. :)

But thanks anyway. And, yup you got my question right. I want to know how to find out about the given angle of a blade.
 
if you dont want to go to that trouble and want to sharpen your knife paint the edge with a sharpie and then work the edge till the ink wears off. nothing exact but you can duplicate the angle already on the blade.

Also, I wonder if certain companies only use a certain angle? Then you can make a chart saying X company has X angle. just my thoughts.



dave
 
Measure the edge thickness and width. The angle is approx. thickness / width * 30. The exact angle is ArcTan (thickness / width * 0.5) .

-Cliff
 
Cliff, excellent tip. The edge forms a right-angled triangle. We can easily find the base (edge thickness x 0.5) and one side (length of the edge) then some basic trig gets the blade angle. I am kicking myself right now for not figuring that out myself.
 
Cliff and Rev's comments are right on, but maybe a bit sophisticated for many. UltraSteele gave a rather simple way to at least get a good approximation of the angle.;)
 
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