Gritomatic HAPSTONE-V5-BBS Assembly instructions

1. TECHNICAL SPECIFICATIONS AND FEATURES
Dimensions and weight:
Knife sharpener dimensions (ready to work) 64х16х21 cm (25”x 6 ¼”x 8 ¼”)
Shipping dimensions 38x28x7 cm (15”x 11”x 2 ¾”)
Horizontal shaft 64 cm (25”)
Knife sharpener weight 3.2 kg (7 lbs)
Features of the HAPSTONE PRO knife sharpener:
All parts are made of metal and covered with powder coating which provides
excellent coverage and excellent resistance to physical damage.
The universal stone holder is made of aluminum, which is suitable for the installation
of sharpening stones ranging from 10 to 20 cm (from 4” to 8”) in length. The stone
holder is designed so that forms with bevels at 45 degrees and 90 degrees can be
inserted.
Angle indicator marks are on the pivot rod (at 15, 18, 20, 25 and 30 degrees).
The set includes a thickness compensator which allows the use of sharpening stones
of different thickness while maintaining the chosen sharpening angle.
The blade table is covered with rubber.
The neodymium magnet is installed to facilitate knife fastening and the sharpening
process.
The knife sharpener is supplied with an aluminum guide which can be used as a
holding strap to help fasten knives more securely.
HAPSTONE PRO is vibration resistant due to rubber tips on the supporting legs.
Bundles and optional accessories are available.
2. STANDARD CONFIGURATION
HAPSTONE PRO knife sharpener 1 pc.
Black marker 1 pc.
Thickness compensator 1 pc.
Hex key 1 pc.
Wrench 1 pc.
Brunox oil 10 ml (0.3 oz) bottle 1 pc.
Manual 1 pc.
Carton box 1 pc.

3. SETUP INSTRUCTIONS
3.1. Attach the T-shaped supporting
leg to the base of the knife sharpener
so it is parallel to the back supporting
leg. At the front side of the base, the T-
shaped supporting leg should be
secured with the hex key that comes
with the kit.
3.2. On the back side of the base, the
pivot rod should be installed. It should
be screwed in clockwise and securely
attached to the lower part of the guide
with a wrench (included in the kit)
setting it into the one-sided groove.
The knife sharpener is supplied with a
screw nut to secure the pivot rod
underneath. After that install the
thickness compensator and fix it with
the thumb screw, as shown in the
figure.
3.3. Twist together the two parts of the horizontal shaft by hand. The stone holder is
already installed on one of them. Then, holding the handle on one side, tighten the other
side with a wrench.
3.4. The pivot unit should be
put on the pivot rod and the
horizontal shaft.
Note. As a safety feature, the
horizontal shaft has two
bronze rings, which serve to
limit the travel of the shaft.
They need to be fixed with
the hex key that comes with
the kit.

4. PRE-OPERATION INSTRUCTIONS
4.1 Setting the sharpening angle
Before sharpening a knife, it is the necessary to choose the sharpening angle. The
sharpening angle chosen depends on the type of knife steel or purpose for which the knife
is to be used. The smaller the sharpening angle, the thinner the cutting edge on the knife
and, consequently, the sharper the blade that is obtained. But it should be remembered
that sharp blades are easier to damage when used, especially if hard surfaces are cut. Thus,
you have to find an optimum angle that makes the knife sharp enough for your needs, but
not too easily damaged. Recommendations for the choice of sharpening angle (in
accordance with the type of the knife) are given in the chart below:
Type and purpose of the knife
Sharpening angle
Razors, scalpels
From 10 to 15 degrees
Knives for vegetables, bread, filleting
From 15 to 20 degrees
Professional kitchen knives of different types
From 20 to 25 degrees
Hunting knives and all-purposes knives
From 25 to 30 degrees
Dagger type knives, axes
From 30 to 40 degrees
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 PRO, 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 PRO.
You’ll see angle color marks for knife sharpening (at 15, 18, 20, 25 and 30 degrees) on the
pivot rod of the HAPSTONE PRO 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. If you need other
angles, you can use the chart given below. The distance (in mm) between the base and
upper part of the thickness compensator is shown.
Degrees
Height, mm
Degrees
Height, mm
Degrees
Height, mm
10°
51 mm
20°
106 mm
30°
168 mm
11°
56 mm
21°
112 mm
31°
175 mm
12°
62 mm
22°
118 mm
32°
182 mm
13°
67 mm
23°
123 mm
33°
189 mm
14°
73 mm
24°
130 mm
34°
196 mm
15°
78 mm
25°
136 mm
35°
204 mm
16°
83 mm
26°
142 mm
17°
89 mm
27°
148 mm
18°
94 mm
28°
155 mm
19°
100 mm
29°
161 mm

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.
After you clamp the pivot with the thumb screw, the
sharpening stone can be removed. The distance you
get between the thickness compensator and the
pivot is to compensate for the variance in
sharpening angle created by the sharpening stone.
Now, the sharpening angle is set with the utmost
precision.
4.3. Attaching the sharpening stone
The sharpening stone should be fastened on the horizontal
shaft in the stone holder. Because sharpening stones can
be of different lengths, the clamp with the fixing screw is
movable. It moves along the entire length of the horizontal
shaft and this allows a sharpening stone of any length to be
attached.
With two fingers press the nearest side of the stone holder
through the spring and get it as close as you can to the
wooden handle. Put the sharpening stone into the stone
holder and fasten it with the thumb screw.

Note: When changing sharpening stones of different thicknesses, control the angle of
sharpening of the knife. It should remain unchanged. Every time a sharpening stone is
changed the procedure for measuring the sharpening stone (between the thickness
compensator and the pivot) described in section 4.2. should be repeated. If the sharpening
stones are of the same size/thickness, there is no need to measure again.
4.4. Fastening the knife
Position the knife on the rubber mat at the base of the knife sharpener. The edge of a knife
with a blade should be directed outwards (towards you). You will immediately feel the
magnet located in front part of the base. The cutting edge of the knife must slightly overlap
the edge of the base (approximately 1-3 mm).
Attach the aluminum guide tightly to the knife
and secure it with the large fixing screw. You can
use the aluminum guide as a clamp too. You
need not worry about the safety of your blade,
because the guide is made of aluminum. For
additional protection, you can cover the blade
with protective tape.
5. KNIFE SHARPENING RECOMMENDATIONS
You should use the coarsest sharpening stone to begin
sharpening the knife. You should move the sharpening stone
away from you along the blade, and then return it to the
initial position without touching the blade. This is especially
important when working with fine sharpening stones.
The whole blade should be worked until you see burrs
(fractured stripes of metal along the whole length of the
cutting edge). These can be felt by slowly drawing your nail
along the lower part of the edge. After you’ve sharpened the
first side, flip the knife and repeat the procedure for the
second side.
Change the sharpening stones from the coarsest to finer and
sharpen both sides of the knife again. Finer sharpening
stones have less granularity and will eliminate the burrs.
While changing sharpening stones, remove metal filings from
the blade and the knife sharpener to prevent cross
contamination of sharpening stones.

6. OPERATION CONDITIONS AND PRECAUTIONS
HAPSTONE PRO knife sharpener is made of steel and covered with high-quality coating. It
can be used in any conditions. It can be conveniently placed on any surface and its rubber-
tipped legs prevent it from sliding while sharpening.
Before using the knife sharpener, be sure that the horizontal shaft can move freely inside
the pivot unit. If the horizontal shaft does not move smoothly, wipe it with a dry cloth and
oil it (a bottle of oil is included in the assembly kit).
While sharpening a knife, observe all safety measures. Be careful that your hand does not
to slide down the sharp part of a knife.
During the sharpening process, magnetized metal shavings usually accumulates on the
blade of the knife. Use the wipe periodically to clean the blade and remove the
accumulated shavings.
Thank you for choosing HAPSTONE. We wish you sharp knives!
© 2015 HAPSTONE PRO
© 2015 Edited by Gritomatic