Definition Of Stock Material; Selecting Saw Blade Material; Selecting Blade Pitch; Various Blade Types - Jet Elite EHB-350DGSVIP Mode D'emploi

10.1 Definition of Stock Material

Table 11-1 lists the characteristics of the materials to be cut.
So that the correct saw blade can be chosen.

10.2 Selecting Saw Blade Material

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

10.3 Selecting Blade Pitch

First of all the pitch of the teeth must be chosen, in other
words, the number of teeth per inch (25,4 mm) suitable for the
material to be cut, according to these criteria:
- Parts with a thin and/or variable section such as profiles,
pipes and plate, need close toothing, so that the number of
teeth used simultaneously in cutting is from 3 to 6
- Parts with large transverse sections and solid sections need
widely spaced teeth to allow for the greater volume of
shavings and for a better tooth penetration (Fig 10-1).
Figure 10-1: Blade Pitch Selection
- Parts made of soft material or plastic (light alloys, mild
bronze, Teflon, wood, etc.) also require widely spaced
toothing;
- Pieces cut in bundles require combo tooth design.
In short, the pitch depends on:
- The hardness of the material
- The dimensions of the section
- The wall thickness.
BLADE TEETH SELECTION TABLE
2 CONTINUOUS
THICKNESS MM
TOOTH DESIGN
TILL 1.5
FROM 1 TO 2
FROM 2 TO 3
FROM 3 TO 5
FROM 4 TO 5
MORE THAN 6
S = THICKNESS
Figure 10-2: Profiled Material
2 COMBO
TOOTH DESIGN
SOLID  OR LMM
TILL 30
FROM 30 TO 60
FROM 40 TO 80
MORE THAN 90
 = DIAMETER
Figure 10-3: Solid Material

10.4 Various Blade Types

They differ essentially in their constructive characteristics,
such as:
- Shape and cutting angle (rake) of tooth
- Pitch
- Set
Shape and rake of tooth:
REGULAR TOOTH: Oº rake and constant pitch.
Most common form for cross or inclined cutting of small solid
and average cross-sectioned pipes. For mild steel and gray cast
iron or general metal.
POSITIVE RAKE TOOTH:
9º - 10º positive rake and constant pitch.
positive
Particularly use for cross or inclined cuts in solid sections of
large pipes. But above all for 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.
distance between teeth
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 materials in size and type.
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2 CONTINUOUS 2 COMBO TOOTH
TOOTH DESIGN DESIGN
L = WIDTH