tormek SVM-45 User manual

52
Knife Jig SVM-45
Note The height of the bench
must not be too high when
grinding knives. 550–650 mm
(22–26") is suitable depending
on your height.
Design
The jig comprises an adjustable clamp (1) for holding knives
of any thickness and an adjustable stop (2). You adjust the
jig to the knife thickness with the screw (3) and lock by
tightening the knob (4).
The jig rests on the Universal Support. The exact edge
angle is set by rotating the stop or with the Micro Adjust on
the Universal Support.
The Universal Support is normally placed vertically for
grinding towards the edge. Short knives can also be ground
away from the edge with the Universal Support placed
horizontally (page 57).
45 mm (1¾")
Grinding direction: Towards or away from the edge.
Positioning of Machine
KNIVES
Min length of blade 60 mm (2
 ").
CARVERS DRAWKNIVES

53
Check that the knob is loose. Adjust the jig with the
smallscrew to fit the thick-
nessof the knife.
Tighten the knob. The knife is
now firmly mounted in the jig.
Mounting the knife in the jig
The edge angle on the tip is depending on where the jig is mounted
on the blade (a). If it is mounted towards the handle, the edge angle
at the tip will be smaller. If the jig is mounted towards the tip, the
edge angle at the tip will be larger.
The correct mounting position
(a) will make the bevel and the
edge angle the same along the
entire length of the blade.
The jig needs to grip the knife with min 2 mm ( 4 "). You can grind
knives with a width down to 14 mm (
9/16 ") with an edge angle of
25°. Knives with narrower blades, see SVM-00 page 59.
Minimum width of blade

54
Colour the bevel with a marker
so that you can see where the
grinding will occur.
Turn the stop of the jig to zero. Earlier design with locking screw.
(The new design is self-locking.)
Set the Universal Support
so that the heel of the bevel
touches the grinding wheel.
Replicating the existing edge angle
Set the desired edge angle
on the AngleMaster WM-200.
Adjust the jig until the whole
bevel touches the angle setter.
You can measure the edge
angle in the grooves of the
AngleMaster.
Setting a new edge angle and measuring an edge angle
Raise the Universal Support with the Micro Adjust until the whole
bevel touches the grinding wheel. Check by moving the wheel by
hand to see where the grinding will take place.

55
Thin Knives
When setting an edge angle on thin knives the length of the bevel is too short to be aligned
to the angle setter. Let the angle setter touch the blade of the knife instead of the bevel. Then
the angle setter should be set to half of the desired edge angle.
Recommended Edge Angles
Select the edge angle for the type of knife and it’s intended use. With a narrow edge angle
(20°) the knife cuts very easily but the edge is not so durable. A larger edge angle (40°) gives
a stronger and more durable edge.
Woodcarving knives.
Slicing, lleting and paring
knives.
Knives for butchers and cooks.
Hunting and sporting knives.
20–25°
25–30°
30–40°

56
Grinding
Hold the knife and the jig as illustrated. Make sure that you press
your thumb (or palm) on the jig so that it is always pressed against
the back of the Universal Support. Move the knife slowly back and
forth over the grinding wheel. Ensure that the blade is in contact
with the entire width of the wheel. Raise the knife handle when
grinding the tip of the knife.
Grind until a burr forms on the
upper side along the entire
length of the blade. This you
will notice by lightly stroking
theblade from the back.
Tip Watch how the water flows over the edge to ensure that the blade is
in contact with the entire width of the grinding wheel. This is important to
achieve an even bevel.
In good light the burr will show
up as a silver line. When you
have a burr along the entire
blade, the first side is ground.
When the first side is ground, turn the jig upside-down – the knife
is still fixed in the jig – and grind the other side. Now the burr ap-
pears immediately as it has already developed on the under side.
Grind as much as on the first side to obtain a symmetrical edge.
The burr will be weakened and
more easily removed later if you
grind the first side again with a
light pressure.
Tip When grinding long knives, remove the honing wheel.

57
Grinding Away From the Edge
This instruction has so far shown how to grind knives towards the edge with the Universal
Support placed vertically. This way works for all types and lengths of knives. For short
knives you can also place the Universal Support in the horizontal position and thus grind
away from the edge. This can be an advantage when you only need to sharpen the edge
slightly since grinding away from the edge gives a lower grinding pressure. With this grinding
direction you can keep the knife mounted in the jig and hone on the leather honing wheel
with a controlled angle.
Long knives cannot be ground this way since the jig touches the leg of the Universal Sup-
port. (On the T-4 model you cannot grind knives with jigs away from the edge as this model
is too narrow between grinding wheel and honing wheel.)
Short knives, which you can mount in the jig up to approx. 50 mm
(2") from the tip (a), can be ground away from the edge.
Move the Universal Support to
the honing wheel side. Set the
jig so you get the same honing
angle as grinding angle.
Turn the machine around. Dismount the knife. Hone and polish
the bevels on the leather honing wheel. Let the entire bevel touch
the leather wheel, so you hone at the same angle as at the
grinding. Move the knife back and forth a few times on each side
of the blade until the burr disappears.
You can ensure that the burr is
completely removed by drawing
the knife through a piece of end
grain wood.
Honing
Important Always hone in the direction of rotation (away from the edge).
Place the machine as shown with the wheels running away from you and the
honing wheel to the left.

58
Press the jig downwards so that
the stop is all the time in con-
tact with the Universal Support.
Ensure that the grinding takes
place across the entire width
ofthe grinding wheel.
Hone free-hand. Hold the knife diagonally to clear the grinding
wheel. Hone the bevel and the reverse side alternately.
Carver’s Drawknives