|Sharpening Handbook - Kitchen Knives||
Because sharp enough
... usually is not.
Guidelines shown below are for Included Angles (⍺).
I've not found value in adding micro/secondary bevels to pocket knives, so that is not recommended here. If the sharpener wants to add one, an additional 2º should be sufficient.
If you want to get truly sharp, Dr. Vadim Kraichuk with KnifeGrinders has a really good method and has adapted the Tormek system to these wheels. The KnifeGrinder method is one that is proven, and has great tools to assist with making it easy.
CB's USB Projection Calculator is recommended for calculating setup for Tormek knife jigs. (The simpler Projection Calculator is also still available.)
|Bread Knife||(use these instructions : Serrated Edge Knives)|
Could be anything up to 35º, however Dr. Vadim Kraichuk at KnifeGrinders recommends 24º.
Given his vast experience and testing data, this is the recommended value.
Vadim posted a great analysis titled, "Edge Stability in Butcher’s and Kitchen Knives as a Function of Edge Angle and Initial Sharpness" on the BESS EXchange.
|Type||1st Deburring||2d Deburring||Notes|
|Angle||Grit size||Angle||Grit size|
||3 - 6 µm
||0.25 - 0.5 µm
||Edge Angle Stropping - for steels which are brittle, have high hardness, are high carbon or carbide steels.|
||3 - 6 µm
||High Angle Stropping - for steels which are tough or ductile, have low hardness or low carbon, or are fine carbide.|
The following scanning electron microscope (SEM) images show the burr on a knife in the 1st image, that was then “ripped off” by cutting cross-grain into a piece of redwood in the 2nd image – loss of the sharp edge is obvious.
Click on either image for bigger size.
Images courtesy Todd Simpson via Dr. Vadim Kraichuk of KnifeGrinders
Key take-away from these photos : don't skip the honing step.
Good videos showing the use of the Tormek Knife Jigs : SVM-45, SVM-100 (no longer sold), SVM-140, and SVM-00:
|Jeff Farris - Knife Sharpening with Tormek|
|Steve Bottorff - Using Tormek Knife Jigs|
|Tormek Knife Jig SVM-45|
|Tormek Long Knife Jig SVM-140|
|Tormek Small Knife Holder SVM-00|
|Tormek AngleMaster WM-200|
|Herman Trivilino showing the use of a platform jig|
|Knife Grinders showing sharpening of knives with convex curves|
|Knife Grinders showing sharpening of knives with concave curves|
|Knife Grinders showing how to mounting the pin pivot collar on your knife jig
Pin Pivot Jig
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