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SAWS
BY: MELVIN ER-ER
In the metal workshop, materials
(especially metals) are cut to shape before
filing. The numerous types of saw used for
cutting purposes in the school workshop
including the hacksaw, the junior hacksaw,
the sheet saw and the piercing saw
HACKSAW
 This has a steel frame, which can
be turned at right angles for
cutting deep into the material.
The blade is secured in the rigid
frame. The teeth point forward to
enable the saw to cut on the
forward stroke.
 hacksaw
 Hacksaw (adjustment frame)
 Piercing saw
 Hacksaws blade are made of cast
or high-speed steel. There are two
types:
Flexible and All hard – snaps easily,
and it is therefore not recommended
for school work.
 the blades come in the following
lengths; 225, 250 and 300 mm.
they are also available with 14,
18, 24 and 32 teeth per 25mm for
cutting different materials.
 SAW TEETH FOR DIFFERENT MATERIALS
 At least three consecutive teeth should be in contact with material.
 If the material is soft and has a
large section, use a blade with
few teeth per 25 mm (14 or 18
teeth per 25 mm) use a fine-tooth
blade when cutting a fairly thin
section.
 Points to watch when using the hacksaw are as follows:
 Hold the work securely in the vice.
 Grip the hacksaw firmly, using both
hands.
 Use the same stance as for filling.
 Use the full length of the blade.
 Move the blade in a straight line to
avoid breaking it.
 Do not exert too much pressure on
the blade.
7. Make sure the blade is held tightly
in the frame; if it is loose, it is likely
to break.
Other saws
The junior hacksaw has a spring
tension frame, which takes blade
about 150 mm long and 6 mm wide. It
is a useful tool for small work. The
sheet saw is used for cutting large
sheets of metal or other materials,
and is fitted with the standard
hacksaw blade(32 teeth per 25 mm)
The piercing saw is used for fine
work, either for decorative patterns
or for cutting circles in beaten
metalwork. To fix the blade, loosen
one end and pass it through a hole
drilled in the work, then re-fix it in
the frame.

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Saws

  • 1. SAWS BY: MELVIN ER-ER In the metal workshop, materials (especially metals) are cut to shape before filing. The numerous types of saw used for cutting purposes in the school workshop including the hacksaw, the junior hacksaw, the sheet saw and the piercing saw HACKSAW  This has a steel frame, which can be turned at right angles for cutting deep into the material. The blade is secured in the rigid frame. The teeth point forward to enable the saw to cut on the forward stroke.  hacksaw  Hacksaw (adjustment frame)
  • 2.  Piercing saw  Hacksaws blade are made of cast or high-speed steel. There are two types: Flexible and All hard – snaps easily, and it is therefore not recommended for school work.  the blades come in the following lengths; 225, 250 and 300 mm. they are also available with 14, 18, 24 and 32 teeth per 25mm for cutting different materials.  SAW TEETH FOR DIFFERENT MATERIALS  At least three consecutive teeth should be in contact with material.  If the material is soft and has a large section, use a blade with few teeth per 25 mm (14 or 18 teeth per 25 mm) use a fine-tooth
  • 3. blade when cutting a fairly thin section.  Points to watch when using the hacksaw are as follows:  Hold the work securely in the vice.  Grip the hacksaw firmly, using both hands.  Use the same stance as for filling.  Use the full length of the blade.  Move the blade in a straight line to avoid breaking it.  Do not exert too much pressure on the blade. 7. Make sure the blade is held tightly in the frame; if it is loose, it is likely to break. Other saws
  • 4. The junior hacksaw has a spring tension frame, which takes blade about 150 mm long and 6 mm wide. It is a useful tool for small work. The sheet saw is used for cutting large sheets of metal or other materials, and is fitted with the standard hacksaw blade(32 teeth per 25 mm) The piercing saw is used for fine work, either for decorative patterns or for cutting circles in beaten metalwork. To fix the blade, loosen one end and pass it through a hole drilled in the work, then re-fix it in the frame.