jet promac SX-823DGVI Gebrauchsanleitung Seite 16

The choice of toothing (i.e. the number of teeth per inch)
should be such that at least 3 teeth are always in action
at the same time.
When cutting thick material, a coarse Tooth Pitch "T" is
needed to accommodate the big chips.
Cutting speed selection
The general rule is the harder the material being cut, the
slower the blade speed.
20 m/min
for stainless steel, alloy steel and bearing bronzes.
30-50 m/min
for mild steel, hard brass or bronze.
60 - 85 m/min
for soft brass, aluminium or other light materials.
Saw band lubricant
The lifetime of the saw band can be extended
significantly by lubricating it with stick wax item no.
100103.
NOTE
Some materials, such as stainless steel or aluminium,
require specific oils.
Rounding of teeth
A carefully broken in blade lasts much longer and gives
better performance.
To break in your new blade, run it at only 30% of normal
pressure for ten minutes.
Then gradually increase to normal pressure.
Feed pressure selection:
A good indication of proper feed pressure is the shape of the
cutting chips.
Perfect:
Loose curled chips
If the chips are thin or powdered increase the feed pressure.
If the chips are burned reduce the cutting speed and
decrease the feed pressure.
10.1 Blade structure
Bi-metal blades are the most commonly used. They consist
of a silicon-steel blade backing by a laser welded high speed
steel (HHS) cutting edge. The type of stocks are classified in
M2, M42, M51 and differ from each other because of their
major hardness due to the increasing percentage of Cobalt
(Cc) and molybdenum (Mo) contained in the metal alloy.
10.2 Blade type
They differ essentially in their constructive characteristics
- Shape and cutting angle of tooth,- Pitch
REGULAR TOOTH: Oº rake and constant pitch.
Most common form for transversal or inclined cutting of solid
small and average cross-sections or pipes, in laminated mild
steel and gray iron or general metal.
POSITIVE RAKE TOOTH: 9º - 10º positive rake and constant
pitch.
Particular use for crosswise or inclined cuts in solid sections
or large pipes, but above all harder materials (highly alloyed
and stainless steels, special bronze and forge pig iron).
COMBO TOOTH: pitch varies between teeth and
consequently varying teeth size and varying gullet depths.
Pitch varies between teeth, which ensures a smoother,
quieter cut and longer blade life owing to the lack of vibration.
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