Too Sharp

Joined
Jan 3, 2002
Messages
41
I have been sharpening a customer's Wusthof and Zwilling/JK Hinckels kitchen knives ( 8.5 and 8 inch chef's knives, another 8 inch knife and a pairing knife). They were some of the dullest knives I have come across. In an effort to get them very sharp I may have over did it. The knives are very near razor blade sharp and it seems the steel is not good enough to handle this level of sharpness. The edge dents or rolls very easily. I'm not sure if my problem is a residual burr root or if the edge is just too fragile.

The customer needs to butcher one or more deer next week. If he avoids bone or other hard materials the knives should cut wonderfully. However, they will probably dull quickly. These knives were sharpened on Tormek T4 using the standard 220/1000 stone and a 4000 grit Japanese water stone. I ground the edges at a very shallow angle (probably too shallow) to enhance sharpness.

Deburring was done on a belt Rikon belt sander with a plain leather belt.

How should I go about fixing this problem? Any suggestions would be appreciated.
 
Stick with a 30 degree inclusive angle. Stay under 4000 grit. Give your customer a finishing steel to restore the edge. Butchers have been doing this forever.
 
My wife's Henckels knives are sharpened at 30 degrees inclusive but get a 42 degree micro-bevel for longevity, ease of touchups. They last much longer this way. No help with trying to cut bone though.
 
Sounds like he beats on his knives. My family does the same cutting on ceramic plates and stone countertop.
 
With many steels the works dictates the angle. A chef’s knife he’s using for delicate slicing, you can get away with the super fine edge. But carving up a deer! Yeah, the 30 degree edge is the way to go it will will still go thru the meat a grissle fine and the bone strike won’t ruin it like a 10 degree edge would.
 
I wouldn't generalize like that. My deer skinning knife is about 15-20° inclusive and works through a whole deer no problem.
I often find if you're noticing shiny spots in the edge quickly after cutting something it's not the edge rolling. It's the wire edge you missed being folded over. Probably the most important and difficult part of sharpening
 
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