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Tormek Grinding Wheels |
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Grinding Wheel |
Tormek Part Num |
Grit① |
Grain |
Material |
Knoop Hardness |
Comments |
|---|---|---|---|---|---|---|
| Original Grindstone② | SG-250 SG-200 | 220 to 1,000 |
64 to 18 |
Aluminum Oxide (Al2O3) | 2,200 |
Grit is regraded using the Tormek SP-650 Stone Grader. Dr. Larrin Thomas noted in his book, Knife Engineering: Steel, Heat Treating, and Geometry (2025), (Aluminum oxide) is a very effective abrasive on hard steels. However, it is softer than vanadium, nobium, and tungsten carbides, and is less effective in grinding steels containing those carbides. and, ... polishing of vanadium-containing steels is challenging with standard aluminum oxide ... abrasives. |
| Blackstone Silicon | SB-250 | 220 to 1,000④ |
64 to 18 |
Silicon Carbide | 2,700 |
Targeted for use on high speed steel (HSS) and other high alloy steels. Can be used for ceramic blades, but is not recommended for those. Dr. Larrin Thomas noted in his book, Knife Engineering: Steel, Heat Treating, and Geometry (2025), Silicon carbide is harder than aluminum oxide, but it is brittle and fractures during grinding, making it less effective for grinding steel. Therefore, silicon carbide is preferred only when carbide hardness is the primary limiting factor for grinding or fine polishing, where grit breakdown is desired for a good finish. and, ... polishing of vanadium-containing steels is challenging with standard ... silicon carbide abrasives. Not available in a 200mm size. |
| Japanese Waterstone | SJ-250 SJ-200 | 4,000 | 3 | Aluminum Oxide (Al2O3) | 2,200 |
Excellent for adding Micro Bevels. Dr. Larrin Thomas noted in his book, Knife Engineering: Steel, Heat Treating, and Geometry (2025), ... polishing of vanadium-containing steels is challenging with standard aluminum oxide and silicon carbide abrasives. |
| Diamond Wheel Coarse③ | DC-250 DC-200 | 360 | 50 | Diamond on steel | 8,800 |
Dr. Larrin Thomas noted in his book, Knife Engineering: Steel, Heat Treating, and Geometry (2025), Diamond and cubic boron nitride (CBN) are much harder than vanadium carbide, but abrasive belts and grinding wheels are generally much more expensive in CBN and diamond. |
| Diamond Wheel Fine③ | DF-250 DF-200 | 600 | 30 | Diamond on steel | 8,800 | |
| Diamond Wheel Extra Fine③ | DE-250 DE-200 | 1,200 | 10 | Diamond on steel | 8,800 | |
| Leather Honing Wheel |
LA-145
LA-220
LA-100 LA-120 LA-121 |
n/a | n/a | Leather with adhered honing compound | n/a |
Honing compound used with the leather wheel(s) provides the grit needed for honing the edge. Various compounds provide different grits. LA-100, LA-120, & LA-121 are profiled wheels used for honing curved tools (e.g., gouges). |
| Honing Compound | PA-70 | 8,000 | 3 | n/a | ||
| Composite Honing Wheel | DCW-220 | 2,000 | 12 | Composite with embedded honing compound | n/a | |