Delta 20-330 Instruction Manual download pdf (Page 16)

BLADE SELECTION

1. Your band saw uses blades 1/2" wide, 64½" long

and .020-.025 thick. Accessory blades with a pitch

(number of teeth per. inch of the blade) of 10 and 14

are available from Delta.

2. Never use a blade so coarse that less than three

consecutive teeth are engaged in the workpiece at one

time. (Too few teeth will cause the teeth to strip out).

3. Never use a blade finer than required to obtain a

satisfactory surface finish or satisfactory flatness (Too

many teeth engaged in the workpiece will prevent

attainment of a satisfactory sawing rate; frequently

produce "dished" cuts or cuts which are neither square

or parallel).

4. When thin rectangular solid bar is to be sawed, the

work should, whenever possible, be loaded with the

thinnest cross section exposed to the blade teeth. The

pitch (number of teeth per. inch of the blade) selected

must provide engagement of at least three consecutive

teeth in the workpiece. Should application of this rule

not be possible because the thinnest cross section is

too thin, the piece must be loaded with the wider

dimension exposed to the saw teeth and a coarser blade

selected.

5. When thin wall pipe or tubing or channel iron are cut,

a 14 pitch (number of teeth per inch) blade is used.

Fewer than 14 teeth per inch will almost never be

satisfactory.For standard wall pipe or tubing 10 teeth per

inch is satisfactory.

Material To Be Cut Speed Belt Position

Motor Gear

Tool Steel 80 FPM Small Large

Stainless Steel

Alloy Steel

Hard Bronze

Mild Steel 120 FPM Middle Middle

Medium Hard Brass

Medium Hard

Bronze

Soft Brass 200 FPM Large Small

Aluminum

Plastic

Other Light

Materials

When changing speeds, release belt tension and open

belt and pulley guard cover (D) Fig. 30. Speed rates of

80, 120, and 200 feet per minute are available with your

band saw. When the belt is on the largest step of the

motor pulley (A) Fig. 30, and the smallest step of the

gear box pulley (B) the blade speed will be 200 feet per

minute. When the belt is on the smallest step of the

motor pulley (A) and the largest step of the gear box

pulley (B) the blade speed will be 80 feet per minute.

When changing speeds, first release belt tension. After

the desired speed is obtained, adjust belt tension and

close belt and pulley guard cover (D).

Fig. 30

SPEED AND MATERIAL CHART

Fig. 31 illustrates the correct speeds and the position of

the belt on the motor and gear box pulleys for most

common materials cut on the band saw.

Fig. 31

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 22 23 24

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Delta 20-330 Instruction Manual Page 16

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