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Sharpening technique (3 main concepts: abrasives, angle, and technique…
Sharpening technique
3 main concepts: abrasives, angle, and technique
The relief angle is the angle used to taper the blade back to the proper thickness. The sharpening angle is dependent on how well the relief is tapered back. The grinding angle should never exceed 25 degrees.
For the grinding done with the coarse abrasive, any grinding motion can be used. For the grinding done with the fine abrasive, the finishing stroke should always be done slowly into the cutting edge. Alternate strokes should be used to finish the edge.
Coarse abrasive is used to remove all of the scrap iron from the blade, and fine abrasive is used to finish the edge.
Hollow grinder: prepares the edge for sharpening by removing unnecessary metal from the sides of the blade. This would be the coarse abrasive.
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Edger: produces a consistent sharp edge along the entire length of the blade. This would be the fine abrasive.
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Single bevel blades
Examples of single bevel blades are scissors, saws, wood chisels, ice augers, plane blades, and jointer blades.
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