Guidelines shown below are for Included Angles (α).
Green wood carving can use a lower included angle (α) than when carving dry wood.
CB's USB Projection Calculator is recommended for calculating setup for Tormek knife jigs. (The simpler Projection Calculator is also still available. This one is web-based and does not require Excel.)
|Chip Carving Knife||
||Concave or Slightly Convex||
Could be as low as 15° or 16° included angle, especially on softer woods.
The Scandi grind can be "grabby" on the wood when slicing into it. The micro-bevel grind does not cut as cleanly.
|General Carving Knife||20°
Could be up to 25° included angle.
|Sloyd Knife||22 - 25°
Angle can go smaller or greater, depending on need.
The convex grind is preferred by some as it gives a radius from which to adjust the angle of attack. Others say differently. You will need to identify which you prefer.
Some versions of this knife do not have the same angle on each side (this is more common with those which are hand-made). This means the Bevel Angle (β) may not be 50% of the Included Angle (α).
It is advisable to use a Sharpie marker to ensure you are grinding the same angle as was delivered. Once you have achieved the angle that matches the grind, record it onto a label attached to the knife. This will enable you to repeat the grind easier next time (or at least make dialing it in faster).
The scanning electron microscope (SEM) images to the right 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.
Key take-away from these photos : don't skip the honing step.
|Edge Geometry by Hewn and Hone|
Tormek Live Sharpening Class - Part 4 - Carving Knife & Carving Tools
Wolfgang and Sèbastian from Tormek go through the sharpening of carving knives and various carving tools such as v-tools, carving gouges and short wood chisels.
Around 24:00, there is a discussion on sharpening hook knives (with the grind on the outside edge). Sharpening the inside edge must be done by hand, or using the method advocated in The Complete Guide to Sharpening (1996) by Leonard Lee.
Tormek Live Sharpening Class - Part 1. Knife sharpening
Wolfgang and Sèbastian from Tormek talk about different techniques for knife sharpening.
Tormek Live Sharpening Class - Part 9 - Sharpen a flat bevel with Tormek MB-100 on a diamond wheel
In this episode we learn how to use the Tormek MB-100 Multi Base to sharpen a completely flat bevel ▼, on the side of Tormek's diamond wheels DC-250, DF-250 and DE-250. For some tools, such as 🎻 luthier knives,🔪 Kiridashi knives, v-tools, chip carving knives and Japanese plane irons, a completely flat surface on the bevel is preferred over a slightly concave, which you get when you sharpen on the rounded part of the grinding wheel. For some people this is more of a personal preference.
Regardless of what might be the reason to want a flat bevel, Sèbastian and Wolfgang show how to achieve it with your Tormek wet sharpening system, They will also touch upon the differences between the different types of bevels.
Tormek Live Sharpening Class - Part 10. Advanced knife sharpening
Wolfgang and Sèbastian from Tormek talk about advanced techniques for knife sharpening.
Tormek Live Sharpening Class - Part 15. Repair a damaged knife
Wolfgang and Sèbastian from Tormek show you how you can repair damaged knife on your Tormek sharpening system If your knife has a chipped edge, a broken tip, or if it has started rusting, you can often repair the knife and make it as good as new.
|Demonstrating Tormek's Centering Knife Jigs KJ-45 & KJ-140|
|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 common Tormek mistakes in knife sharpening|
|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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