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Video: Saw blade sharpening machine Edge/Apex of a knife after sharpening and stropping. Although this edge is sharp enough to bite a thumbnail, cut paper smoothly, or shave arm hair, the microscope plainly shows an edge which reflects light back into the lens. A truly sharp edge is too thin to reflect significant light.
Knife sharpening proceeds in several stages, in order from coarsest (most destructive) to finest (most delicate). These may be referred to either by the effect or by the tool. Naming by effect, the stages are: sharpening: removing metal to form a new edge rough sharpening (using either water stones, oil stones, or medium grits of sandpaper)
Jointing is usually the first step in the process of sharpening: When sharpening a hand saw blade, the teeth are jointed by running a flat file over the tips of the teeth so that they are all of the same height. Circular saw blades are jointed prior to sharpening so that all teeth protrude from the blade the same distance from the centre.
Original file (WebM audio/video file, VP8/Vorbis, length 46 s, 1,920 × 1,080 pixels, 5.84 Mbps overall, file size: 32.06 MB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
Roughly sharpening a blunt edge 1000-2000: 8 μm: Fine, will leave a blade sharper than most factory edges 4,000: 4 μm: Ultra-fine, for cutting meat 8,000: 2 μm: Further smoothing a sharp edge for cutting fish or vegetables (sinews in meat will bend an edge this sharp) 10,000: 0.5 μm: Polishing an edge to a mirror-smooth (but possibly ...
The Federal Reserve’s top banking regulator Michael Barr will step down from his position in February, saying that "the risk of a dispute over the position could be a distraction from our mission."
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