17 Mar 2012, 2:11am

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Sharpening Chisels

Sharpening chisels for carving. Acute chisel cleanly and easily cuts the tree, run with it – fun. Good sharp tool leaves no rough edges, cut gives smooth, with a slight sheen. Depending on the degree blunt grinding process is divided into three types. The first type of sharpening applied when necessary to restore a chamfer or spalled edge. Therefore, grinding of the first kind in the blunting spend winepress, grinding wheels different granularity. In order to prevent spalling of the metal, it is necessary to remove thin layers of a few passages. Bevel, filmed during grinding, becomes slightly concave, the concavity of the radius depends on the diameter of the grinding range: the lower range, the deeper the cut.

When enchanted by a circle with a large grain size are deep longitudinal risks that it is desirable to remove the fine-grained abrasive at the same diameter as the coarse range. That the metal sliver less, better to grind at low speeds of the machine, if it is regulated by the speed. Sharpened tools to move smoothly over the surface of the grinding wheel is strictly at a right angle, that achieved by proper installation of paintings on podruchnike grinding machine with respect to the circle. After machining grinding by hand to keep sticks of different grits and finish grinding on the touchstone. Burr.

On the burr should pay special attention, it has a significant impact on the quality of grinding, and as a consequence, the subsequent process of carving. In the process of chamfering metal is shifted to the end of the wedge and remains on the cutting edge in the form of jagged stripes – Burr. The particles are connected to the burr blade. When sharpening must ensure that a smooth burr thread separated from the blade came down himself. If it will break off, then on the cutting edge Risks remain that will leave marks on the treated wood. The second facet. A role in sharpening plays second facet. As mentioned, when sharpening a chisel blade bevel is formed, the concave radius of the circle, This is the first facet, it is relatively wide, depending on the thickness of the fabric. The second facet is a narrow ribbon on the end of the first bevel and blade forms an angle slightly greater than the angle first bevel. The second facet has to be polished to a mirror finish on fine whetstone and brought up at the end of the severity of the razor. We have examined in detail the first type most grinding from coarse emery wheel on the stage before the final polishing and editing on whetstone, and skin. The second type is used for sharpening the blade dulled on average, when the facet has retained its shape, and considerably dull blade. In this case, a bar on fine-grained sharpening until slightly noticeable burr and reduce it to the above method, and then rule on the touchstone, and skin. The third type of sharpening is used with a slight edge is dulled, that is performed only on the touchstone of correction and skin without removing the burr.

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