Selecting The Saw Blade; Selecting The Speed; Possible Causes Of Faults; Set Saw Blade Alignment (Fig. 2) - Proxxon DSH Manual De Instrucciones

– Always work with connected vacuum cleaner and carefully set the
air nozzle (8, fig. 1).
– You will achieve the best results if the wood thickness is under
25 mm.
– With wood thicknesses of greater than 25 mm, the work piece
must be very carefully guided to stop the saw blade from jam-
ming, bending, twisting or breaking.
– For precise cutting, note that the saw blade will always try to fol-
low the direction of the fibre (applies particularly to thin saw
blades).

7.1.1 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 re-
quired 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-in-
tensive 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 Material:
approx. 10-14 Soft and hard wood (from approx. 6-50 mm),
plastics, soft materials, thicker work pieces
approx. 17-18 Fine sawing work, wood (up to 6 mm), plastics,
soft materials, thinner work pieces
approx. 25-28 Plastic, GRP, non-ferrous metal, Plexiglas, iron
with restriction Pertinax
approx. 41 Iron, Pertinax
Round sawing blades (with flat ends) can ideally be used for plastic,
hard and soft wood. They cut on all sides, so it is not necessary to
turn the work piece when sawing.

7.1.2 Selecting the speed:

This representation can, of course, only give instructions on the gen-
eral direction to take. As in the previous section, you have to "exper-
iment" a little to find the optimal result. The appropriate speed also,
of course, depends on the blade used, the material of the work piece,
the feed etc.
Level Material
900 strokes/min Steel, brass, non-ferrous metals, GRP, plastics
1400 strokes/min Aluminium, wood, polystyrene, rubber, leather,
cork
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7.1.3 Possible causes of faults:

The following causes may break the saw blade:
– If blade is tensioned too tightly or not tightly enough
– Mechanical overloading of the blade by feeding too quickly.
– Bending or twisting of the blade when turning the work piece too
quickly when cutting curves.
– When the wear limit of the saw blade has been reached.
– If the screws are tightened on saw blades with cross pin.

7.1.3.1 Set saw blade alignment (fig. 2):

In a very few cases (slanted cutting edge in the work piece, strong
blade drift during operation) it could be necessary to make minor
adjustments to the blade alignment at the upper saw blade mount
(see pos. 2, fig. 2). By rotating the saw blade mount, the saw blade
alignment will be changed as desired.
1. Clamp the saw blade and check the parallelism of the saw blade
using an angle 5 (or angled work piece) arranged as shown in the
graphic.
2. The saw blade can be aligned if necessary. Release screw 11 us-
ing an Allen key and swivel the saw blade mount into the correct
position to align the saw blade in parallel to the angle.
3. Tighten the saw blade mount in the correctly set position using the
Allen key 11.

7.2 Sawing (fig. 7)

After you have fixed the saw to the work space, adjusted the work
table, prepared the dust exhaust and air nozzle and have clamped the
suitable saw blades, switch on the machine and guide the work piece
as shown in fig. 7.
Remember: Adapt the feed according to the material, the saw blade
and the work piece thickness. Hard materials, fine saw blades and
thick work pieces do not "tolerate" as much feed as soft materials,
rough saw blades and thin materials.
You can also experiment with various speeds.
Note:
Safe and precise work is only possible with careful fixing!
The mechanical fret saw is predominantly a machine for sawing
curves. For good results, please note the following points:
Please note:
– Only use perfect saw blades.
– Always remove the mains plug for maintenance and upkeep work.
– Do not let the device operate unsupervised.

7.2.1 Inside cuts (fig. 8)

Caution!
Always remove the mains plug before releasing the saw blade.
If you must also make inside cuts when working with your mechan-
ical fret saw, proceed as follows: