Hafco EB-270DSA, Instruction Manual

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8 MATERIAL CLASSIFICATION AND
CHOICE OF TOOL
Since the aim is to obtain excellent cutting quality, the
various parameters such as hardness of the material,
shape and thickness, transverse cutting section of the
part to be cut, selection of the type of cutting blade,
cutting speed and control of saw frame lowering.
These 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 crop up from time to time
will be solved more easily if the operator has a good
knowledge of these specifications.
8.1 Definition of materials
The table above lists the characteristics of the
materials to be cut. So as to choose the right tool to
use.
8.2 Selecting blade
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 toothing to allow for the
greater volume of the shavings and better tooth
penetration;
- 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.
8.3 Teeth pitch
As already stated, this depends on the following
factors:
- Hardness of the material
- Dimensions of the section
- Wall thickness.
11 Instruction Manual for EB-270DSA (B066) 31/03/2016