The Scraper's cutting edge is formed by one step on the grinder. The grinding action forms the hook.
|75º||Alan Batty recommended 70º with the under side ground back at 40º (a relief grind).
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 Tool Rest.
Both work, but the Tormek grinds away less metal, so that is what I prefer.
|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.
|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.)
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