Experiments on Knife Sharpening John D. Verhoeven ... - BushcraftUK

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general the edge roughness, as seen in the face views, produced by the 220 grit wheel waslarger than that produced by the waterstone wheel. Interestingly, the bur formed by the220 grit wheel appears to result mainly form the Bending mechanism discussed on page3, while that formed by the waterstone wheel appears to have formed from the DebrisDeposit mechanism.Honing on the leather wheelThe blades were honed on the chrome oxideloaded leather wheel by adjusting the 2β edge honing angle, first to match the as-ground2β edge angle of 40 o . A series of blades was then honed with the 2β honing angleincreased to 45-46 o . Although the increased honing angle did not seem to change theface smoothness or edge straightness much, it did produce a slightly smaller edge width.Therefore, subsequent leather honing experiments presented here were done with26
the 2β target hone angle set to around 5 to 6 o larger than the as-ground 2β angle of theblades. The leather honing was done with very light pressure. The blades were passedback-and-forth across the wheel at a slow rate of around 1 inch per second. A total of 4to 6 back-and-forth passes were made on alternate sides of the blades. <strong>Experiments</strong> withincreased pressure did not produce significant changes. Figures 32 and 33 present SEMmicrographs of the blades of Figs. 30 and 31 after the honing treatment. Increasing thenumber of back and forth passes to 10 to 12 did not produce significant changes.Figures 32 and 33 illustrate that honing on the chrome oxide loaded leather stropproduces edges of excellent quality on blades as-ground on both the 220 grit and thewaterstone wheels. In both cases the face smoothness is excellent and the edgeroughness and straightness seen in the face views are also very good. It does appear thatthe edge width of the blades ground with the 220 grit wheel, Fig. 32, is a bit larger thanthat of the blade ground on the waterstone, Fig. 33. Figure 33 includes a blowup of theedge at a magnification of 10,000x, superimposed on the edge view. As shown, the edgewidth is on the order of 0.35 microns. (Note: On sharp edges, the secondary electrons that form27
Page 1 and 2: Experiments on Kni
Page 4 and 5: as a guide to good sharpening techn
Page 6 and 7: machine ground. The final 2β edge
Page 8: [2] Experiments wi
Page 11 and 12: Even on freshly dressed wheels a 2
Page 13 and 14: ledges of material has broken out o
Page 15 and 16: at the 2β edge angles of 50 and 70
Page 17 and 18: 7 All of the blades that were studi
Page 19 and 20: Japanese waterstones plus leather s
Page 21 and 22: Figs. 23-24. The blade of Fig. 25 w
Page 23 and 24: Figs 23 to 26. It appears that the
Page 25: [5] Experiments wi
Page 29 and 30: lade of Fig. 33 along part of the l
Page 31 and 32: 3 Dropping the 2β edge angle from
Page 33 and 34: the 600 grit wheels were largely re
Page 35 and 36: seen that the buffing action is rem
Page 37 and 38: [7] Experiments on
Page 39 and 40: found that the softer steel produce
Page 41 and 42: optimum EW values found for afinal
Page 43 and 44: [9] Summary and ConclusionsThese ex
Page 45 and 46: 6 When the 2β edge angle is reduce
Page 47 and 48: Appendix 1Edge angle measurements w
Page 49 and 50: β = arc cosine((R 2 +L 2 -Y 2 -h 2
Page 51 and 52: YY = 45.5 mmLThese parameters can b
Page 53 and 54: Appendix 3The Tru Hone Sharpening M
Page 55: To overcome this problem withgrindi

Experiments on Knife Sharpening John D. Verhoeven ... - BushcraftUK

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