PowerPoint Presentation
Drills; Saws
Presented by Orlando Moreno+1 770.354.3072
[email protected] of California at Berkeley
Introduction to Power Tools 00104-15
ObjectivesWhen trainees have completed this session, they should
be able to do the following:
Identify and explain how to use various types of power drills
and impact wrenches.Identify and explain how to use common power
drills and bits. Identify and explain how to use a hammer
drill.Identify and explain how to use pneumatic drills and impact
wrenches.Identify and explain how to use various types of power
saws.Identify and explain how to use a circular saw.Identify and
explain how to use saber and reciprocating saws.
Introduction to Power Tools 00104-15
ObjectivesRelated Performance Tasks:
Safely and properly demonstrate the use of the following
tool(s):
Electric drillHammer drill or rotary hammer
Introduction to Power Tools 00104-15
Drills and BitsIntroduction to Power Tools 00104-15Basic drill
design is the same for most types, with only slight
differences.
.
Describe power drills and identify the types of power drills
that will be presented. Talk about the operation of variable-speed
models. Describe the different types of drill bits and how they are
sized. 4
Drills and Bits
Introduction to Power Tools 00104-15Bit selection depends upon
the material being drilled and, of course, the size of the hole
required
Drills Introduction to Power Tools 00104-15These drills work
well between studs and joists in walls and ceilings. The difference
between the two models shown here is power.
Introduce right-angle drills. 6
DrillsIntroduction to Power Tools 00104-15These drills are
operated like a drill press, using a hand wheel to push the bit
against the workpiece. Maintain power to maintain the
electromagnet!
Describe an electromagnetic drill. Explain that the
electromagnet must be powered electrically along with the drill.
Use the figure to describe how it is operated. 7
Using a DrillIntroduction to Power Tools 00104-15Use the chuck
key to tighten the chuck jaws; use all three holes in the
chuck.
.
Explain how to install a drill bit or other tool into a drill
chuck. Point out that keyed chucks with three holes should be
tightened by using all three key positions. Emphasize the need to
remove the key from the chuck. Review the guidance provided in
drilling holes in wood and metal. Explain that drill sound and
speed are good indicators of the load placed upon it. Discuss how
to handle the drill as it exits the workpiece. Describe the use of
a keyless chuck on cordless models. 8
Using a DrillIntroduction to Power Tools 00104-15Most cordless
drills have a simpler type of chuck that does not require a key,
but grip is slightly compromised
Rotary HammersIntroduction to Power Tools 00104-15Rotary hammers
provide more pounding action than hammer drills, and at a lower
frequency.
Introduce rotary hammers; compare and contrast the two different
tools. Use the figure to show the different bit shank designs
needed for rotary hammers. 10
Rotary HammersIntroduction to Power Tools 00104-15Each rotary
hammer brand requires a specific bit shank style. Adapters can be
used, but they extend the overall length of the bit.
Pneumatic ToolsIntroduction to Power Tools 00104-15.
Pneumatic drills and impact wrenches eliminate the electric
motor and provide plenty of power and durability
Identify when a pneumatic drill might be chosen. Identify the
common pneumatic drill sizes. Describe pneumatic impact wrenches
and how they are used. Explain that the compressed air supply must
be set to the proper pressure. Describe how to connect the air
source and install a whip check. 12
Pneumatic ToolsIntroduction to Power Tools 00104-15A whip check
keeps the hose from whipping about if the connection is severed
while under pressure.
Circular SawsIntroduction to Power Tools 00104-15Like drills,
all circular saws have a great deal in common. However, the weight,
balance, and feel of saws can differ quite a bit.
Circular SawsIntroduction to Power Tools 00104-15Blade choice
depends upon the material being cut, cut direction (cross-cut or
rip for wood), and how smooth the cut edge needs to be. Carbide
teeth increase blade life significantly.
Describe a circular saw and identify other names for this tool
trainees may hear. Discuss the blade sizes available for circular
saws. Talk about the construction of a circular saw. Review the
list of saw blade types that are common. 15
Circular SawsIntroduction to Power Tools 00104-15The saw kerf
must be considered in measurements and when making the cut. Always
be aware of which side of the cut line you need to place the saw
blade.
As you mark the cut line, mark an X on the side that is
waste.Guards will move as the cut progresses.Both hands on the saw.
The material should be clamped, not held with one hand.Use the
blade as a guide once the notch in the baseplate moves off the
workpiece.Never force the saw.Manage the power cord before the cut
begins.Keep the lower blade guard free and clean. Do not add oil or
grease.
Discuss the proper PPE for circular saw use. Explain that the
saw must be set to allow the blade to penetrate the material, but
not extend through the workpiece farther than necessary. Describe
how to properly mark cutting lines with consideration for the kerf.
Talk about how to properly guide and control the saw.Emphasize that
the saw blade should be properly installed and the guards must be
in place before energizing a saw. Point out that the saw should not
be forced into the material and that the material must be well
secured. Discuss the need for cleaning specific parts of the saw.
Explain that oil and grease should be avoided. Discuss the
importance of a clean, sharp blade.
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Saber SawsIntroduction to Power Tools 00104-15Technically, these
are reciprocating saws too. Adjustable baseplates, swiveling left
to right, allow them to make beveled cuts.
Describe the saber saw and talk about its versatility in
detailed work. Point out that the cutting action only occurs in one
direction, and that it is when the blade is moving toward the tool.
Discuss the different types of blades available. Explain how to
make use of variable- or multi-speed models. 17
Reciprocating SawsIntroduction to Power Tools 00104-15These saws
are excellent for demolition work. Their design and cutting action
makes them unsuitable for detail work.
Clamp the workpiece down or be sure that what is being
demolished is physically sound.Be aware of what may fall or change
position in the midst of, or at the end of, a cut.Use sharp blades;
they can dull quickly.Use higher speeds for wood than metal. Metal
blades have significantly more teeth.Avoid bending the blade over
while cutting.Ensure the blade is properly secured in the saw;
broken blades often leave a piece in the saw blade mount.Keep a
firm grip. These saws often jump around, especially when using
coarse blades.
Compare and contrast saber saws and larger reciprocating saws.
Point out that the reciprocating saws are excellent for demolition
work. Describe variable- and multi-speed models. Discuss the two
types of baseplates encountered.Emphasize the need for securing the
workpiece, although the saw is often used to cut fixed construction
components. Point out that the blades may dull quickly due to the
punishment they experience. Discuss the need to apply the right
amount of pressure to the saw.
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19/48QUESTIONS ?Orlando Moreno+1
[email protected]
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