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==Turning the burr==
[[File:Ziehklingenstahl.jpeg|thumb|right|300px|Burnisher for card scrapers]]
[[File:Sharpening of card scraper.jpg|thumb|Process of sharpening:<br/>1. Rough edge<br/>2. Squared edge<br/>3. (Optional) first pass<br/>4. Turning the burr]]
The cutting component of a card scraper is the [[Burr (metal)|burred]] edge of the scraper. The '''burr''' is a sharp hook of metal which is '''turned''' on the edge of the scraper by burnishing with a steel rod. A [[file (tool)|file]] or [[sharpening stone]] is used to [[jointing (sharpening)|joint]] the edge of the scraper before burnishing. Cabinet makers typically joint the edge square, or at a right angle to the face of the scraper, which allows a fine burr to be turned on both sides. [[Luthier]]s often use a [[bevel]]ed edge, which allows a more aggressive burr, but on one side only.
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