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undertensioned, the saw blade can lightly crack. Turn knurled
button 1 to set the tensioning. If the button is moved to the
right (clockwise), the saw blade is more tightly tensioned. If it
is turned to the left (anticlockwise) the blade is loosened.
A correctly tensioned blade sounds a slight tone if "plucked"
like a string.
8.7.5 Removing saw blade (fig. 5a and 5b):
8.7.5.1 Saw blades with cross pin (fig. 5a).
1. Position the quick tensioning lever 4 to the front
2. Press top arm 5 slightly down so that the saw blade 1 can
be released from the top mount 6. Take out saw blade.
3. Take out saw blade from bottom mount 3 and remove
through table opening 2.
8.7.5.2 Saw blades with plain ends (fig. 5b):
1. Position the quick tensioning lever 4 to the front.
1. Open wingnut 8, the saw blade 1 releases from the top
mount 7.
2. Open cheese-head screw 7 with the T-handle Allen key 5,
release saw blade from the lower mount 3 and remove
through the table opening.
9 Working with the saw:
9.1 General information for working with mechanical scroll
saw:
The mechanical scroll saw is predominantly a machine for
sawing curves and precise sections. A typical application is
shown in fig. 7. The work piece must be carefully guided by
the operator. Note: Mechanical scroll saws are normally
operated without length stop, as the saw blade loses its line íf
forced in, particularly in the grain of wood.
Please note that the saw blade only saws in reverse motion in
the direction in which the teeth point.
For good results, please note the following points:
– When sawing, press the work piece onto the work plate (fig.
7), guide by feeling and with little power; more pressure on
the work plate, less pressure against the saw blade.
– Make sure that the work piece is lying properly on the saw
table (nor burrs or sawdust)
– Adapt the feed to the requirements by saw blade, speed
and work piece material.
– Guide the work piece slowly into the saw blade, particularly
if the blade is very thin and the teeth very fine or if the work
piece is very thick. Note: The teeth only cut in reverse
motion.
– Only use perfect saw blades.
– Do not let the device operate unsupervised.
– Carefully mark out/block the check line.
– Make sure there is good lighting.
– Always work with connected vacuum cleaner and carefully
set the air nozzle (7, fig. 1).
– You will achieve the best results if the wood thickness is
under 1".
– With wood thicknesses of greater than 1", the work piece
must be very carefully guided to stop the saw blade from
jamming, bending, twisting or breaking.
– For precise cutting, note that the saw blade will always try
to follow the direction of the fibre (applies particularly to
thin saw blades).
9.1.1 Selecting the saw blade:
As already mentioned, the correct selection of material has a
very great influence on the quality of the result. The table
below should serve as a small guide. Extensive experience
with many materials and types of saw blade is, of course,
always helpful with selection. You can experiment here.
Tip: The saw blades are mostly only particularly worn at
places where the teeth are particularly highly utilised when
sawing and, therefore, become blunt very quickly. To "use
up" the non-worn teeth and thus increase the edge life of the
sawing blades, you can artificially "raise" the bearing surface
for the work piece somewhat.
To do this, simply secure a smooth, table-sized underlay with
the required thickness to the saw table, using, for example,
double-sided sticky tape. The non-worn parts of the saw
blade are now sawing the work piece.
This is particularly sensible if you often saw very hard and
wear-intensive materials with thin blades.
The numerical data for characterising the "fineness" of the
toothing is related to the number of teeth per inch of saw
blade length:
Teeth/inches
approx. 10-14
approx. 17-18
approx. 25-28
approx. 41
Material:
Soft and hard wood
(from approx. 3/16"-2"),
plastics, soft materials,
thicker work pieces
Fine sawing work, wood
(up to 3/16"), plastics, soft
materials, thinner work pieces
Plastic, GRP, non-ferrous
metal, Plexiglas, iron with
restriction Pertinax
Iron, Pertinax
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