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

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References1 L. Leonard, The Complete Guide to Sharpening, The Tauton Press, Newtown, CT (1995).2 J. Juranitch, The Razor Edge book of Sharpening, Warner Books, New York, NY (1985).3 I. Kirby, Sharpening with Waterstones, Cambium Press, Bethel, CT (1998).4 J.F. Sackman, A Close Shave, Physics in Technology, vol. 9, 208-213(1978).5 E. Kiesler, Personal communication, Technical Services, Brownells, Inc. (2004).6 J.D. Verhoeven, A.H. Pendray, W.E. Dauksch, The key role of impurities in ancient Damascussteel blades, Journal of Metals, vol. 50, 58-64 (1998). www.tms.org/pubs/journals/JOM/9809/Verhoeven-9809.html46
Appendix 1Edge angle measurements with a laser pointerA relatively crude but effective device was built to measure the 2α and 2β edgeangles utilizing a laser beam. A simple laser pointer, sold for a pointing device whengiving a lecture, was mounted as shown in Fig. A1. The diagram shows how the laserbeam is reflected to the 2 sides of the knife edge. The deflected beams strike thecalibrated cross board at specific locations, which can be seen well in a lighted room.Scratches on the edge cause the beam spot to become blurry. The sharpness of deflectedspots revealed in a darkened room were found useful in evaluating the edge smoothness.The device allowed the distance of the cross board from the knife edge to be adjusted tomaintain a fixed value of X. The distance of a deflected spot from the zero defectionpoint of the laser beam, called d, is related to the face angle, say α, as:α 1 = [arc tangent (d(α 1 )/X)]/2, where 2α = α 1 + α 2Crossboardd(β 1)d(α 1)Zerodeflectiond(α 2)d(β 2)Laser pointerCalibratedscalexBladeholderFigure A1 Schematic diagram of the laser device used to measure theface angle 2α and the edge angle 2β.Using this equation a scale calibrated in degrees was pasted to the cross board. Values ofthe 4 angles, β 1 , α 1 , α 2 , and β 2 can be read directly from the scale.47
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 and 26: [5] Experiments wi
Page 27 and 28: the 2β target hone angle set to ar
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: 6 When the 2β edge angle is reduce
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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