copyright © 2010 delmar, cengage learning. all rights reserved. unit 14 portable power tools
TRANSCRIPT
Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED.
Unit 14
Portable Power Tools
Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED.
Safety Precautions
• Secure the work• Use sharp blades, bits, or abrasives• Set up work area in a dry location• Wear shoes with rubber soles• Use a GFCI• Have proper balance and footing• Wear eye and face protection• Wear appropriate protective clothing
Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED.
Electrical Cords
• Always check cord for broken insulation or plugs, bare wires, or any other damage
• Types– three wires: two carry current for the motor, one is a
safety ground wire– two-wires: non-grounded cord
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Extension Cords
• Use three-wire grounded extensions for tools with metal bodies
• Use a cord longer than needed to reach the job
• Always be aware of the cord location• Wire diameter must be the proper size to
carry the electrical current required by the tool being used
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Air-Driven Tools
• Powered by compressed air– compressed air: air pumped under high pressure via
special hoses
• Can be very dangerous, especially when hoses are being coupled/uncoupled
• Do not uncouple hoses near other people
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Nail Guns
• Used extensively in the construction industry
• Make sure the gun is pressed firmly to the wood before the trigger is pulled
• Always wear eye protection
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Types of Nailers
• Electric nailer: work well in soft wood• Combustion nailer: do not require an air
compressor• Brad nailer: the smallest nailer• Finish nailer: used for trim work• Framing nailer: used for structural framing
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Drills• Classified by chuck size, power rating, or duty
cycle• Major parts of a drill
– power cord– handle– motor housing– gear chuck– vents– trigger switch– trigger switch lock– reversing switch– chuck wrench/key
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Types of Drills
• Variable speed: motor speed can be controlled by operator
• Reversible: runs backward and forward• Hammering: turns bit while providing a
striking action• Cordless: powered by rechargeable battery
pack
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Portable Sanders
• Sand with the grain for fine work• Sand across the grain when
– boards are uneven– boards are extremely rough – removing difficult finishes
• Three types of portable sanders– belt sander– disc sander– finishing sander
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Belt Sander• Uses a moving sanding belt• Make sure work is well secured• Major parts
– motor housing– handles– belt– belt rollers– belt adjustment– trigger switch– switch lock– power cord– dust bag
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Disc Sanders• Sanding grit on a revolving plate• Can be used for wood or metal• Major parts
– Motor housing– handles– power cord– switch lock– cooling vents– wheel– spindle– safety guard– tool rest
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Finishing Sanders• Small sanding pad moving in random forward-
backward or circular pattern• Generally the power sander used on a project• Major parts
– motor housing– handles– switch– switch lock– power cord– paper clamps– pad– sandpaper
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Saws
• Useful for carpentry projects and repair activities
• Types– sabre saw– reciprocating saw– circular saw
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Sabre Saws• Also called bayonet saw• Used to cut curves or holes• Up and down saw blade motion• Major parts
– motor housing– base– blade– toe– blade retention screw– handles– switch– power cord
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Reciprocating Saws• Also called the tiger saw• Operated like a drill• Sawing action at the end of the saw rather than underneath• Major parts
– motor housing– blade retention screw– blade– shoe– vents– handles– power cord– trigger switch– switch lock
Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED.
Circular Saws
• Also called a power handsaw• Motor-driven, round blade• Most popular woodworking saw• Very dangerous due to its high speed and
tendency to kick back
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Circular Saws (continued)• Major parts
– motor housing– handles– power cord– trigger switch– switch lock– guard– guard lift lever– retractable guard– blade– spindle– base– angle adjustment lock– angle scale
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Routers
• Used to cut grooves and ornamental shapes into soft materials
• Commonly used for making dado, rabbet, and dovetail joints, installing butt hinges, making signs, and decorative work
• Use clean, sharp bits for safe, even cuts
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Routers (continued)
• Major parts– base– see-through chip deflector– depth-of-cut lock– depth indicator– handles– motor– switch– depth-of-cut adjuster– collet
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Important Terms
• Sawhorse/trestle: wood or metal beam with legs
• Ground-fault circuit interrupter (GFCI): breaks the electrical circuit when the operator is threatened by electrical shock
• Duty cycle: amount of time a motor can run before it needs time to cool off
• Continuous duty: can be used continuously for 6 to 8 hours a day
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Important Terms (continued)
• Pilot hole: small hole to guide the center point of larger drills
• Orbital sander: moves in a random circular pattern
• Grinder: power tool with a spinning, rigid grinding wheel
• Blind cut: made by piercing a hole with the saw blade