Experiments on Knife Sharpening

By John D. Verhoeven

This paintings has focused on comparing the effectiveness of assorted knife sprucing ideas by means of interpreting the sharpened edges of the knives in a scanning electron microscope, SEM.

Much could be realized via exam of a sharpened knife aspect with a
magnifying glass or an optical microscope, really the binocular microscope. even if, the optical microscope suffers from a critical hassle. Its intensity of box turns into tremendous small because the magnification raises. as a result inherent curvature on the sharp fringe of a knife, the optical photographs lose their usefulness at magnifications a lot above round 50x of so. The SEM overcomes this trouble. considered one of its striking positive factors is that the intensity of box is way enhanced over the optical microscope, at the order of three hundred occasions better.
Hence, the SEM is able to delivering transparent pictures of the sting of sharpened knives at magnifications as much as 10,000x.

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Comparability of the buffed blade micrographs to it is going to permit an evaluate of the impression of the buffing operation. all the eight buffed blade edges of desk three (4 blades every one with A & T edges) have been tested within the SEM and Fig. forty provides consultant micrographs of 3 of the blades. The designation of T or A at the micrographs refers back to the blade facet tested. for instance, 2T capacity the T fringe of blade 2 of desk three and 3A capability the A fringe of blade three of desk three. After buffing the blade edges seemed soft and shinny to the attention, and Fig. forty exhibits that the abrasive grooves produced through 32 strain reasonable Medium Medium Medium Med. the six hundred grit wheels have been mostly got rid of by means of the buffing operation. A small bur was once regularly came upon on all the blades and a degree of the sting width used to be made on all the blades utilizing the SEM micorgraphs. desk four provides a precis of the variety of area width values stumbled on for the eight blades. there have been transparent result of this research. (1) The T fringe of the blades possessed thinner burs than the A edges. additionally, the burs alongside the T side have been extra uniform than alongside the A area. This consequence could be obvious by means of evaluating Blade 2T to Blade 3A desk four Measurements of area widths. in Fig. forty. (2) using the 2-step buffing operation on Blade area width Blade side width blades four, always produced thinner burs than any of the 1T zero. 8-2 µm 1A 1-5 µm unmarried step operations used on blades 1 to three. the diversities 2T zero. 8-2 µm 2A 1-5 µm of the buffing approaches hired with blades 1 to three, see 3T zero. 8-2 µm 3A 1-5 µm desk three, didn't produce any major swap in area 4T zero. three -2µm 4A zero. five - five µm caliber. The 2-step buffing operation used the coarser compound for step one on a material wheel, via the finer compound on a felt wheel. it's normal perform in metallograhic sprucing of metals to continue from coarse to positive grit abrasives. it's been the adventure of this writer that making use of this innovative form of sprucing is way better at generating smoother ultimate surfaces. it kind of feels most likely related impression happens the following, with using a 2-step revolutionary grit dimension method in a position to decrease the sting bur extra successfully than using simply the ultimate effective grit compound. extra experiments will be had to ensure this chance. the explanation why the bur measurement at the A edges have been considerably better than at the T edges is unknown. the following additionally, extra experiments are had to make sure the resource of this transformation. go Sectional Outlines The optical photos of the polished pass sections of the blades have been gathered digitally. The electronic pictures have been then processed on a computer to superimpose a white line alongside the outer surfaces of the blades, as proven for 2 of the blades in Fig. forty-one. The extension of the outlines to the crossover aspect permits a cheap estimate of the unique form of the blade sooner than buffing. the unique geometry of the sting used to be identified from sections of unbuffed blades. it truly is obvious from Fig.

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