Slide 1

PowerPoint® Presentation

Unit 14
Portable Power Saws
Power Tool Safety • Circular Saws •
Reciprocating Saws • Jigsaws •
Cutout Saws • Chain Saws


Slide 2

Unit 14 — Portable Power Saws

A portable GFCI
compares the amount
of current in the hot or
ungrounded conductor
with the amount of
current in the common
or grounded conductor
and immediately
breaks the circuit if a
difference greater than
5 mA exists.


Slide 3

Unit 14 — Portable Power Saws

Various configurations of approved grounded outlets
are available for construction power tools and
equipment.


Slide 4

Unit 14 — Portable Power Saws

In a typical grounding system,
a ground wire runs from the
power tool (in this case, a
circular saw) to the grounded
plug. Another ground wire runs
from the grounded receptacle
to a grounding bar in the
service panel. A copper ground
wire extends from the service
panel to a ground rod or other
grounding means in the earth.


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Unit 14 — Portable Power Saws

Side-drive and wormdrive circular saws are
frequently used in
construction work.


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Unit 14 — Portable Power Saws

Blade diameter affects the maximum depth of cut.
When the blade angle is set to 45°, the depth of cut is
decreased.


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Unit 14 — Portable Power Saws

Different blades are used
with a circular saw for
different operations.


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Unit 14 — Portable Power Saws

When cutting a
compound angle
with a circular saw,
set the depth of the
blade slightly more
than the thickness
of the material.


Slide 9

Unit 14 — Portable Power Saws

When crosscutting
long boards supported
by sawhorses, do not
cut between the
sawhorses. Instead,
make a cut past the
end of a sawhorse.


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Unit 14 — Portable Power Saws

Position the panel to
be cut with the waste
piece overhanging the
supporting panels.


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Unit 14 — Portable Power Saws

An adjustable
fence attachment
aids in making a
narrow rip cut with
a circular saw.


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Unit 14 — Portable Power Saws

A straightedge aids in making a straight cut across a
panel.


Slide 13

Unit 14 — Portable Power Saws

Stand to one side
of a circular saw
during use.


Slide 14

Unit 14 — Portable Power Saws

A reciprocating saw is
used for a variety of
applications such as
cutting a door jamb or
notching a stud.


Slide 15

Unit 14 — Portable Power Saws

Different blades are used
with a reciprocating saw
to cut different materials.


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Unit 14 — Portable Power Saws

A jigsaw is used to saw
along curved lines and to
cut circular and
rectangular openings.


Slide 17

Unit 14 — Portable Power Saws

The jigsaw cuts with
an orbital movement.
The blade cuts on
the upstroke and
moves slightly away
from the material on
the downstroke.


Slide 18

Unit 14 — Portable Power Saws

A cutout saw uses a
spiral bit to cut
openings in wood and
nonwood materials
such as an opening in
gypsum board for a
receptacle box.


Slide 19

Unit 14 — Portable Power Saws

A chain saw is used
to cut heavy timbers
and pilings.