Grizzly G0783, Руководство пользователя, Страница: 27 / 48

G0783 (Mfd. Since 05/15)
-25-
Blade Break-in
Proper break-in is important for the cutting per-
formance and longevity of the blade. During the
break-in period, only mild pressure should be
exerted on the blade (about half of the normal
feed pressure for a properly broken-in blade).
The duration of the break-in period is determined
by the hardness of the material cut. The break-
in period is defined in terms of square inches of
material cut.
• For hard materials, such as steel, the break-
in period is the first 50 square inches of mate-
rial cut.
• For soft materials, such as aluminum, the
break-in period is the first 150 square inches
of material cut.
To determine the square inches of a cut, calculate
the area of the cross-section of the workpiece.
Keep in mind when cutting hollow-section piec-
es that the area only includes the solid walls of
the workpiece. Refer to
Figure 32 to calculate
approximate square inches for many typical cuts.
D
L
H
L
Th
Th
H
A = L x H
A = (
D
⁄
2
)² x
π
A =Area
H =Height
L =Length
D =Diameter
Th =Material
Thickness
π
=3.14
A D x
π
x Th
A 2H + 2L x Th
Figure 32.
Calculating cut area for break-in.
Blade Feed Rate
Blade feed rate refers to the period of time it takes
to cut through a workpiece. Feed rate is controlled
by the amount of pressure exerted on the handle
by the user. Pulling hard on the lever will result in
a greater feed rate, whereas only pulling lightly will
result in a very slow feed rate.
Cutting with a feed rate that is too slow can result
in lengthy, inefficient cuts and in some cases,
tooth dulling or overheating. The chips produced
by the cut will generally be thin or powdery.
Cutting with a feed rate that is too fast may cause
the blade to wander, resulting in cuts that are not
straight, and will generate excess heat and dull
the blade. The chips produced by the cut will gen-
erally be thick and hard. When cutting small or
thin-walled workpieces, the edges of the cut may
become rough or torn.
Feed rate will vary depending upon the type of
material being cut, the proper flow of cutting fluid,
and the amount of pressure applied by the user.
Practice on a sample workpiece to learn how
much pressure is needed for a specific cut.
Blade Speed
Selection
The G0783 offers two blade speeds for a variety
of cutting needs. Always use proper blade lubri-
cation and adequate cutting pressure to ensure
maximum blade life.
The slower "1" (57 RPM) speed setting (see
Controls & Components on Page 4) is most
effective for steel alloy (stainless steel) and normal
steel applications.
The faster "2" (114 RPM) speed setting (see
Controls & Components on Page 4) is most
effective for aluminum and other non-ferrous
metals.