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Note: When you read about knife sharpening, you may come across the term “full
sharpening angle.” This means the sum of the two angles used to sharpen both sides of a
blade (e.g. 15 one side + 15 the other side = 30 full sharpening angle). As a result, when
using the Hapstone, you need to divide the value of the full angle by 2 to get the value of
the angle you need to set on the Hapstone.
You'll see angle marks for knife sharpening (at 15, 18, 20, 25, 30, 35 and 40 degrees) on
the pivot rod of the Hapstone knife sharpener. On the lower part of the pivot rod, there is
a mark with the smallest angle value, on the upper part, the largest.
Note. The actual sharpening angle also depends on the thickness of the knife spine. The
thicker the knife spine is, the less the actual angle is. For example, if the knife thickness is
3 mm, the knife sharpening half angle is reduced by about 2 degrees. Keep this in mind
when sharpening.
4 2 . .Using the thickness compensator
Because the sharpening stones vary in size and thickness, the sharpening angle varies as
well. The thicker the sharpening stone is, the smaller the sharpening angle you get. The
thickness compensator helps to keep sharpening angle the same.
After choosing a sharpening angle, lift the
thickness compensator on the pivot rod up
to the necessary angle indicator mark. The
upper side of the thickness compensator
should be on the level of the chosen angle
indicator mark. Next, fasten the compensator
on the pivot rod with the thumb screw. When
setting the angle of sharpening, the
thickness of the sharpening stone should be
taken into consideration. To do this, before
setting the sharpening stone, put it with its
horizontal surface down onto the surface of
the thickness compensator. Lower the pivot
to securely fasten the sharpening stone
between the thickness compensator and
pivot.
