Scantool 320 GSHE, Руководство пользователя

Страница: 12 / 32

11
7. MAKE PROPER TOOTH SELECTION
For maximum cutting efficiency and lowest
cost per cut, it is important to select the blade with
the right number of teeth per inch (TPI) for the
material being cut. The material size and shape
dictate tooth selection.
TOOTH
SELECTION
You need to consider:
The width of the cut - That is, the distance in the
cut that each tooth must travel from the point it
enters the work-piece until it leaves the work-
piece, and
1.The shape of the work-piece.

Squares, Rectangles, Flats (Symbol :
■ )
Locate the width of cut on the chart.
(Inches on the outer circle and
millimeters on the inner circle.) Select
the tooth pitch on the ring marked with
the square shape which aligns with the
width of cut.
EXAMPLE: 6" (150mm) square, use a
2/3 Vari-Tooth.

Round Solids (Symbol : ●)
Locate the diameter of your work-piece
on the chart. Select the tooth pitch on
the ring marked with the round shape
which aligns with the size of stock you
are cutting.
EXAMPLE: 4" (100mm) round, use a 3/4
Vari-Tooth.

Tubing, Pipe, Structural ( Symbol : O H
^ )
Determine the average width of cut by
dividing the area of the work-piece by
the distance the saw blade must travel to
finish the cut. Locate the average width
of cut on the chart. Select the tooth Ditch
on the ring marked with the tubing and
structural shape, which aligns with the
average width you are cutting.
EXAMPLE: 4"(100mm) outside diameter,
3"(75mm) inside diameter tubing.
4"(100mm) OD =12.5 sq.ln.
(79cm
2
)
3"(75 mm ) ID = 7.0 sq.ln.
(44cm
2
)
Area = 5.5 sq.ln.
(35cm
2
)
5.5 sq.ln. (35cm
2
) / 4" (100mm)
distance =1.38(35mm) average width
1.38" (35mm), use a 4/6 Vari-Tooth
NOTE: The band speed and cutting rate
recommendations presented on this
chart are approximations and are to be
used as a starting point for most
applications. For exact sawing
parameters' consult your saw blade
supplier.
8. BI-METAL SPEEDS AND FEEDS
These figures are a guide to cutting 4"(100mm)
material (with a 314 Vari-Tooth) when using a
cutting fluid.
Increase Band Speed: 15% When cutting
1/4"(6.4mm) material (l0/l4 Vari-Tooth)
12% When cutting
3/4"(19 mm) material (6/10 Vari-Tooth)
10% When cutting 1-
1/4"(32 mm) material(5/8 Vari-Tooth)
5% When cutting 2-1/2"
(64 mm) material(4/6 Vari-Tooth)
Decrease Band Speed: 12% When cutting
8"(200mm) material(2/3 Vari-Tooth)
MATERIAL
ALLOY
ASTM NO.
BAND SPEED
FT./MIN M/MIN
Copper
Alloy
173,932 314 96
330,365 284 87
623,624 264 81
230,260,272 244 74
280,264,632,655 244 74