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Scraper |
Edge angles
The Scraper's cutting edge is formed by one step on the grinder. The grinding action forms the hook.
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Someday you will look back at this work, laugh nervously and change the subject. Unknown |
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General Guidelines |
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| α |
Relief |
Comments |
| 75° | 40° |
Some recommend the use of a belt sander (i.e., one which is bolted to the bench, not a hand-held one). I've used that and the Tormek with the Tormek SVD-110 Tool Rest. Both work, but the Tormek grinds away less metal, so that is what I prefer. If you chose to grind a different angle, then use the following guidance when using the Tormek SVD-110 Tool Rest:
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If grinding this on a high speed grinder or sander, be sure to manage the temperature so that the temper is not lost due to overheating.
| High Carbon Steel | Temperature control is critical for high carbon steel. Tempering will be lost in the steel if heated until it is blue (~550°F / 300°C). Cool by dipping as needed in water. |
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High Speed Steel |
Cool by dipping as needed in water. |
| Steel with Carbide Insert |
DO NOT cool by dipping in water. This will cause the carbide to crack due to shocks.
It is also recommended to use a high grit wheel for sharpening carbide as lower grits can cause cracks in the edge leading to it being far more crack-ridden and brittle. (Lower grits can be used for shaping the edge -- see also, Grindstones and Other Sharpening Media - Quick Selection Guide.) |
