Guidelines shown below are for Included Angles (⍺).
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 created an excellent USB Projection Calculator which can be used to calculate the settings you will need to use with the Tormek knife jigs. His calculations have been vetted for accuracy to the sub-degree level.
Drop Point Blade
||This is a common blade and is sharpened to an angle which is good when a sharp tool is needed.
Sheep's Foot Blade
||This is a blade often used for scraping actions. Thusly, it is sharpened to a greater angle, and no secondary grind is applied.|
Spey Point Blade
||This blade is sharpened to a greater angle. This is to allow for its use on tougher materials.|
|Type||1st Deburring||2d Deburring||Notes|
|Angle||Grit size||Angle||Grit size|
|Harder steels||-0.1º to -0.3º
||3 to 6
||3º to 6º
||0.25 to 0.5
||Edge Angle Stropping - for steels which are brittle, have high hardness, are high carbon or carbide steels.|
||3 to 6
||0.4º to 2º
||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.
Tormek is a copyrighted logo of Tormek AB. Its presentation on this site is used to help the user quickly understand when specific Tormek tools, jigs, or setting are being used. For specific information regarding Tormek AB, or its products, please refer to the www.Tormek.com.