Whetstone
The whetstone is a stone grinding tool . It is used for fine grinding and honing of tool blades made of steel . When honing, the burr that forms during grinding is removed.
A distinction is made between natural sharpening stones, which are usually named after their place of origin, and artificial sharpening stones. The artificial whetstones consist of abrasive grains (e.g. corundum , silicon carbide ) and binding agents. High-quality natural whetstones such as the Belgian Brocken or the Arkansas stone usually have a typical grain size of 6000 to 8000 on the JIS scale . This corresponds to a grain size between 2 and 1.2 µm, or the grain sizes FEPA ( Federation of the European Producers of Abrasives ) F 1500 and F 2000. This enables a very fine, almost polished surface to be achieved on the tool cutting edge. The Rozsutec sharpening stones from Slovakia and the slate stones from the Charnwood Forest are also of natural origin .
A distinction is made between stones with a hard and soft bond: A soft bond between the abrasive grains in the stone makes them break out faster, i.e. H. the stone wears out faster. But the surface is always "sharp" and attacks better. Examples of this are the Belgian chunks and fine Japanese water stones . This type should mainly be used for hard steels. The Arkansas stone, on the other hand, has a hard bond, it hardly wears off.
As a rule, the sharpening stones are wetted with water, oil or petroleum before use .
See also
Web links
Individual evidence
- ↑ Standard grain size comparison FEPA P, FEPA F and JIS ( Memento from September 4, 2014 in the Internet Archive ). PDF on the website of the Federation of the European Producers of Abrasives . Retrieved April 17, 2015.
- ↑ Thomas Rossell Potter: The History and Antiquities of Charnwood Forest , 71. Hamilton, Adams, 1842 . Retrieved April 17, 2015.