imaport Siena SN270BT Manual De Instrucciones página 51

Blade Structure
Bi-metal blade are the most commonly used. They consist of
silicon-steel blade backing by a laser welded high speed steel
(HSS) cutting edge. The type of stock are classified in M2, M42,
M51 and differ from each other because their major hardness
due to increasing percentage of Cobalt (Cc) and molybdenum
(Mo) contained in metal alloy.
There are several key factors to consider in choosing a blade
Tooth Pitch---The number of teeth per inch TPI
blade also known as tooth pitch
which will assure that at least three teeth are
contacting the workpiece while cutting
distribute the cutting forces and avoids tooth
breakage
Tooth Form---There are four common forms of teeth on the
blade buttress claw tooth
carbide Precision is the most common and is the
type supplied with this saw
Tooth Set---Set is the degree to which the teeth are bent
away from the blade
raker wave and straight set
Always select and use good quality saw blades and choose
the right blade for the job
requirements with your saw blade dealer to make sure you
are getting the type of blade which best suits your need
Poor quality blades and improper use are often the cause
of premature blade failure
Many conditions can lead to breakage
some cases unavoidable
peculiar stresses that bandsaw blades are subjected to
Blade breakage is also due to avoidable causes
Avoidable breakage is most often the result of poor care
or judgement on the part of the operator when mounting or
adjusting the blade or support guides
causes of blade breakage are
(1) faulty alignment and adjustment of the guides
(2) insufficient number of teeth contacting the cut
(3) feeding too fast
(4) tooth dullness or absence of sufficient set
(5) excessive tension
(6) using a blade with a lumpy or improperly finished
weld and
(7) continuously running the bandsaw when not in use
REGULAR TOOTH
0 rake and constant pitch O
Most common form for transversal or inclined of solid small and
average cross-sections or pipes, in laminated mild steel and
gray iron or general metal.
POSITIVE RAKE TOOTH
9 -10 positive rake and constant pitch O O
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).
on the
Select a pitch
This helps to
precision and tungsten
Typical tooth set styles are
Discuss your cutting
Blade breakage is
since it is the natural result of the
The most common
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.
Another advantage offered in the use of this type of blade in
the fact that with an only blade it is possible to cut a wide
range of different material in size and type.
COMBO TOOTH
9 -10 positive rake O O
This type of blade is the most suitable for the cutting of
section bars and large and thick pipes as well as for the
cutting of solid bars at maximum machine capacity. Available
in
pitches: 3-4/4-6.
Sets
Saw teeth bent out the plane of saw body, resulting in a wide
cut in the work-piece.
Regular or Raker Set
Cutting teeth right and left, alternated by a straight
tooth.
Of great use for materials with dimensions superior to 5mm.
Used for cutting of steel, castings and hard nonferrous
materials.
Wavy Set
Set in smooth waves.
This set is associated with very fine teeth and it is mainly
used for cutting of pipes and thin section bars (from 1-3mm).
Alternate Set (in groups)
Groups of cutting teeth right and left, alternated by a
straight tooth.
This set is associated with very fine teeth and it is used for
extremely thin materials (less than 1mm).
Alternate Set( individual teeth)
Cutting teeth right and left.
This set is used for the cutting of nonferrous soft materials,
plastics and wood.