Types of saw blades

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Types of saw blades

• Crosscut
• used to make smooth cuts across the grain
• Rip
• used to make smooth fast cuts with the grain
• Combination
• used to make fast cuts with or across the grain
• Carbide tipped
• more expensive but have a longer life

2

• Dado head
• used for make selected dado cuts

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Other saw blades

• Hacksaw
• is selected by length, gauge, set of teeth, teeth
  per inch, and metal hardness.
• Band saw
• similar to hacksaw blade, except it is a
  continuous blade
• Both of these types should be selected to to
  allow three teeth to be in contact with the
  surface being cut.

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Sabre saw blades

• Three types
• 1.knife
• for cutting leather
• 2.metal cutting
• have 16 to 32 teeth per inch
• 3.wood cutting
• have 6 to 12 teeth per inch

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Portable circular saw

• Parts
• trigger switch
• guard lift handle
• anti-kickback clutch
• retractable guard
• blade
• handle
• power cord
• angle scale
• tilt lock knob
• tilt base

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Uses of the portable circular saw

• replaces the handsaw in most cases
• takes the place of the bench or table saw
• use in same or different location on any
  particular job
• used for ripping, crosscutting, dodoing,
  grooving,angle cuts,bevels and mitres.
• Considered one of the most important labor saving
  pieces of equipment in the shop
• WHY?

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Procedure for using the circular saw

• select a sharp blade of the correct type
• properly adjust the saw and be sure all
  thumbscrews are tight
• blade should be installed so that the teeth turn
  up toward the saw base
• teeth should extend below the thickness of the
  material to be cut to a distance equal to the
  depth of the teeth
• secure material to be cut

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• start saw before blade touches the work
• saw only in a forward direction
• must be guided along a straight line
• both hands should be used if possible
• at the end of the cut release the trigger switch
  and allow the blade to follow through as the saw
  is lifted away from work

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Sabre Saw
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Parts of the Sabre saw

• on-off switch
• guide knob
• blade screw
• toe
• blade

• tilting base
• base tilt adjustment
• handle
• power cord strain reliever

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Uses of the sabre saw

• referred to as electric jigsaws or bayonet saws
• make a reciprocating motion or orbital or oval
  motion
• allows the cut to be made on the upward stroke
  and the release of the chips on the downward
  stroke
• stroke of blade is about 1 inch
• saw cut varies from about 3200 to 4200 strokes
  per minute

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• motor sizes vary from about 1/6 to 1/2 HP
• considered to be very versatile
• can cut wood, sheet metal, plastics, fiberglass,
  rods, tubing, rubber, masonite, leather, and
  other materials
• to use this for different types of materials, the
  blade has to be the right type