Introduction to Power Tools Module 00104-09

Upon completion of this module, you will be able to: Objectives Upon completion of this module, you will be able to: 1. Identify power tools commonly used in the construction trades. 2. Use power tools safely. 3. Explain how to maintain power tools properly.

1. Safely and properly use three of the following tools: Performance Tasks 1. Safely and properly use three of the following tools: Safely and properly operate an electric drill. Safely and properly operate a circular saw. Safely and properly operate a SawZall®. Safely and properly operate a pneumatic power nailer.

Power Tools Three kinds of power tools Electric Tools – work on alternating current (from a receptacle) or from a direct current (a battery) Pneumatic tools – powered by air Hydraulic tools – powered by fluid pressure

Power Drills Most are similar because they have a pistol grip and a trigger for controlling power – the harder you pull the trigger on a variable speed drill, the faster it will turn All bits are held in the drill by a chuck The chuck key tightens and loosens the chuck Electric drill – uses electricity Cordless drill – uses battery power

Figure 1 – Parts of the power drill

Figure 2 – Drill bits 6

Figure 3 – Chuck key 7

Figure 4 – Proper drill use 8

Figure 5 – Cordless drill 9

Figure 6 – Loading the bit on a cordless drill 10

Hammer drill – has a pounding action that lets you drill into concrete, brick, or tile – the bit rotates and hammers at the same time Electromagnetic drill – a portable drill mounted on an electromagnetic base – used for drilling thick metal – when switched on the electromagnetic base attaches to the metal to keep the drill from moving Pneumatic drill – powered by compressed air

Figure 7 – Hammer drill 12

Figure 9 – Proper use of a hammer drill 13

Figure 10 – Electromagnetic drill 14

Figure 11 – Pneumatic drill 15

Figure 12 – Proper use of a pneumatic drill 16

Power Saws Circular saws – first introduced by the Skil company – many people still call these saws a Skilsaw Blades can range from 3 3/8 inches to 16 ¼ inches – most common is 7 ¼ inches Trigger on handle starts the saw – the teeth on the blade point in the direction of the rotation – two guards protect you from flying debris – the top is stationary to keep you from touching the blade – the lower is spring loaded – it retracts up and under the top guard when you push the saw forward

Figure 13 – Circular saw 18

Saber saw/Jig Saw Very fine blade for delicate or intricate work – patterns or irregular shapes from wood or thin, soft metal Easily changeable blades for cutting many different materials

Figure 15 – Saber saws 20

Reciprocating saw Called a SawZall because it is one of the most popular brands Similar in uses to the saber saw Blade uses back and forth not up and down Usually used for heavy duty jobs

Figure 17 – Reciprocating saw 22

Portable handheld band saw A one piece blade that runs in one direction around guides Used to cut pipe, metal, plastics, wood and other irregularly shaped materials Good for cutting heavy metal

Figure 19 – Portable handheld band saw 24

Figure 20 – Proper use of a portable band saw 25

Miter saw A combination miter box with a circular saw – allows straight and miter cuts Power miter saw – sawblade pivots horizontally from the rear of the table and locks in position to cut angles from 0 to 45 degrees right and left Compound miter saw – the same as a power miter saw except the blade can be tilted vertically Compound slide miter saw – blade has the ability to slide forward

Figure 21 – Miter saws 27

Abrasive cutoff saw Used to make straight or angular cuts through thicker materials like angle iron, flat bar, and channel Blade is usually between 10 and 18 inches in diameter and ¼ inch thick

Figure 22 – Abrasive cutoff saw 29

Angle, end, detail grinders Angle – grind away hard, heavy materials – rotating grinding disc set up in a right angle to the motor shaft – grinding is done with the outside of the grinding disc End grinder – horizontal grinder – used to smooth the inside of materials Detail grinder – use small attachments to smooth and polish intricate work

Figure 23 – Angle grinders 31

Figure 24 – End grinder 32

Figure 25 – Detail grinder and points 33

Bench grinder Stationary grinding machines – usually have two grinding wheels Position the tool rest 1/8 inch from the grinding wheel – rest what you are grinding on the tool rest Most wheels are used for grinding, rust removal, and metal buffing – can have brushes for cleaning and buffing wheels for polishing

Figure 26 – Bench grinder 35

Miscellaneous power tools Pneumatically powered nailers - Powered by compressed air – nailers have specific jobs Power-actuated fastening – low-velocity – powered by gunpowder cartridges called boosters – drive steel pins or steel studs into masonry and steel Air impact wrench – powered by air – fasten, tighten, and loosen nuts and bolts

Figure 28 – Pneumatic nailer 37

Figure 30 – Powder-actuated fastening system 38

Figure 31 – Air impact wrench 39

Pavement breakers, clay spades, rock drills, core borers They reciprocate or Move back and forth Hydraulic jack – pump inside the jack applies pressure to the fluid inside when the handle is pumped – the pressure is applied to the cylinder and lifts or moves the load Porta-Power – lever-operated pump – rated by how much weight they can lift and by the distance they can move it

Figure 32 – Typical demolition tools and attachments 41

Figure 32 – Typical demolition tools and attachments 42

Figure 33 – Portable hydraulic jack 43

Figure 34 – Porta-Power® 44

Supplemental Art

Supplemental Art