copyright © 2010 delmar, cengage learning. all rights reserved. unit 14 portable power tools

Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED.

Unit 14

Portable Power Tools


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


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


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


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


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


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


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


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


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


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


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


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


Saws

• Useful for carpentry projects and repair activities

• Types– sabre saw– reciprocating saw– circular saw


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


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


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


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


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


Routers (continued)

• Major parts– base– see-through chip deflector– depth-of-cut lock– depth indicator– handles– motor– switch– depth-of-cut adjuster– collet


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


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

copyright © 2010 delmar, cengage learning. all rights reserved. unit 14 portable power tools

Documents

cengage learning

air compressorbrad nailer

aircompressed air

smallest nailerfinish

trim workframing nailer

soft woodcombustion

portable power toolscopyright

portable sanderssand