becker bk7/9 blade hardness?

bladefan :

BK7 a good slicer with the .188 thick blade?
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The spine is only a factor if the cutting is actually that deep, and the material stiff enough to wedge around the blade at that height. Thus the BK7 is a poor choice to cut foods like turnips as the cuts are deep enough to reach the spine and the vegetable can squeeze on the blade at that depth as it is fairly elastic and strong. Really thick cardboard (double ridged , 1/4" thick) can cause similar problems.

However for most utility work such as fabrics, ropes, woods etc., only a small section of the blade height actually ever sees the material being cut, and most of that doesn't even get pressed on. For example when cutting cord since it opens up once cut and falls away from the edge and can't press strongly against the sides of the blade. For that type of cutting edge angle and to a lesser extent edge thickness are much more critical than spine thickness.

The CU7 has a decently thin and acute edge grind which therefore allow it to cut most materials well. Mine was about 0.036" thick ground at ~16 degrees per side which put it at the top in regards to general cutting ability for blades of its size. Its only real drawback in regard to general functionality is the neutral balance which makes for poor chopping ability - but which has advantages in reducing fatigue for lighter work.

Ref :

http://www.bladeforums.com/forums/showthread.php?s=&threadid=194037


-Cliff
 
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