1. Startseite
  2. Vorwort
  3. Aufbau des Rasiermessers
  4. blade points
  5. razor identification
  6. the edge
  7. grinds
  8. grinds, why
  9. sharpening introduction
  10. stones
  11. strops
  12. using stones, introduction
  13. blade - stone geometry
  14. first stroke on stone
  15. last stroke on stone
  16. using the strop, introduction
  17. first stroke on strop
  18. last stroke on strop
  19. preparation for shave
  20. numbered shaving paths
  21. face, right side
  22. face, left side
  23. chin
  24. coup de maitre
  25. throat
  26. second over
  27. Vorwort zu den Archiven
  28. La pogonotomia I
  29. La pogonotomia II
  30. La pogonotomia III
  31. La pogonotomia IV
  32. the razor I
  33. the razor II
  34. the razor III
  35. the razor IV
  36. the razor V
  37. the razor VI
  38. Quellen, Impressum
  39. summary
  40. guestbook

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     Alle Abbildungen und Texte:
     ©1998-2003 Arthur E. Boon

     Deutsche Übersetzung:
     ©2003 Stefan P. Wolf



























































































The Razor II

The hollow grinding procedure

In principle, it is not important which grade of hollow grind is used, as long as only the cutting edge and the back will touch the hone or strop. In theory, this would already be the case with a grinding wheel of 40 cm diameter, but this is not yet the perfect hollow grind, it is called a 'light' hollow grind or 'flat' grind. The disadvantage is, that in the hand of the layman, including the barber, this 'flat' hollow grind blade rapidly thickens in time after some years of honing. This blade would become dull soon, and could only be resharpened with coarse followed by fine hones. This would take a lot of time and the avarage user would spoil the blade. Another disadvantage is that these blades are very heavy.

The full (1/1) hollow grind has the opposite effect in the hand of the expert or skilled layman. The edge becomes sharper (the razor gets 'settled'), easier to use, and the slight vibration of the edge caused by the belly increases its effect. Errors will be detected immediately and slight damages to the edge can be repaired easily. The razor is light and easy to use, and can be used for an unlimited period of time without regrinding on the wheel. Shaving is smooth and painless - provided that the user follows some rules.

One of those rules is the to conserve the thickness of the back, which should be the blade width divided by 3,5. The hollow grinder divides the blade in two halfes: the upper part is hollow, the lower part is a biconvex belly. The biconvex part consists of the edge, the thinning and the belly. The biconcave part of sole, the hollowing, the back and the stabilizing piece. The sole is the thin transition between the belly and the hollow part.

The end result is a smooth transition between the parts and parallel shadows when keeping the blade in the light. The shadow moves when rotating the blade, and must keep its width at every place of the blade. During stropping or when rubbing the thumb over the edge, the 1/1 hollow grind blade gives a ringing sound (therefore the designation 'singing razors').