Material Classification And Choice Of Saw Blade; Definition Of Stock Material; Selecting Blade Material; Selecting Blade Pitch - Jet ELITE EHB-270DGSVIP Mode D'emploi

Figure 9-2: Coolant Tank
- Remove the pump (Q, Fig 9-3) by loosening the screws.
- Remove the filter screen (P) by loosening the screws.
- Use a vacuum cleaner to vacuum chips and debris from the
tank.
- Replace the plug (T).
- Thoroughly clean the pump (Q) and replace.
- Fill the tank with coolant to approximately 25mm below
the filter screen (P).
- Replace the filter screen (P) and pump (Q).
Figure 9-3: Coolant Pump
10.0 Material Classification and
Choice of Saw Blade
The aim is to obtain excellent cutting quality, given the various
parameters such as hardness of the material.
The specifications must therefore be harmoniously combined
in a single operating condition according to practical
considerations and common sense.
So as to achieve an optimum condition that does not require
countless operations to prepare the machine when there are
many variations in the job to be performed.
The various problems that may arise will be solved more easily
if the operator has a good knowledge of these specifications.
Shape and thickness, crosscut section, saw blade selection,
cutting speed and control of saw frame lowering.

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 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.
Figure 10-2: Profiled Material
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