C-2 Portable Power Tools Flashcards

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1
Q

Powder-actuated tools

A

use gunpowder to fire a fastener int either lumber or wood

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2
Q

Low - Velocity powder actuated tool

A

contains a “captive piston” meaning when the cartridge is fired, the force of the explosion acts first on the piston then fires the fastener to drive into meterial

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3
Q

safety features of LV tools

A
  • captive piston
  • built in device that prevents device from firing
  • two distinct sequential actions required before tool can be fired
  • method for verifying the power level
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4
Q

High Velocity tools

A

Direct acting tools they have no pistons and the fastening pins travel at speeds of 150-460 feet per second

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5
Q

Methods of Propulsion

A
  • impact
  • contact
  • co-acting
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6
Q

Impact

type of fastener

A

gap between piston and fastener. fastener is against the work surface. tool is fired and piston travels down barrel to strike fastener

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7
Q

Contact

A

piston is in contact with fastener which then is in contact with work serface

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8
Q

co- acting

A

piston and fastener are not in contact with work surface

- piston and fastener reach certain speed before hitting work surface

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9
Q

Threaded

A

Bolting an object after a fastener has been driven

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10
Q

headed

A

for fastening an object to concrete or steel

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11
Q

eyelet

A

for holding lightweight objects such as suspended ceiling

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12
Q

Center Punch test

A

used to determine if a material is suitable for fastening with a powder actuated fastener.
try and punch fastener into material should make distinct dent

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13
Q

Minimum thickness of concrete for fastner

A

must be three times the penetration of fastener

  • must be 75mm from edge of concrete
  • do not fasten on joints
  • spaced more then 3 inches
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14
Q

Spalling

A

when fastener blows out bits of concrete from point of entry

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15
Q

how to prevent spalling

A

use washer

  • reduce shank diameter of fastener
  • reduce shank length of fastener
  • reduce cartridge strength
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16
Q

things to consider when fastening to steel

A
  • must be at least 50mm or (2”) away from weld or joint
  • must be at least 13mm (1/2”) away from edge of steel
  • fasteners should be installed 1 inch apart
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17
Q

Gas Powered chainsaw

A
  • most common
  • portable
    disadvantages is fumes
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18
Q

Electric powered Chainsaw

A

sometimes used in enclosed spaces where fumes are to hazardous. not as powerful as gas saws

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19
Q

Battery powered chainsaw

A
  • use large rechargeable batteries 40v

- can be used when no electric power is available

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20
Q

Pneumatic chainsaw

A

air driven chainsaw that requires an air compressor. common in bridgework

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21
Q

Components of chainsaw

A
starter
throttle lockout 
throttle
fueltank
chain oil tank
bucking spike
chain brake
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22
Q

Kickback

A

occurs when rotating chain momentarily hangs up on an obstruction and throws saw back on user

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23
Q

Chain cuts

A

chain still spins after finger is let off throttle keep eyes peeled and stay vigilant

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24
Q

Hammer Drill

A

mechanical action makes the bit vibrate into the concrete

25
Q

Rotary hammer

A

delivered by a piston-like device, delivers blow ten times harder then hammer drill

26
Q

Bull Point bit

A

has sharp point fro breaking up concrete

27
Q

Chisel bit

A

for breaking up concrete and other hard materials

28
Q

scaling or wide chisel bit

A

has wider blade then chisel bit

29
Q

digger bit

A

slightly wider bit used to dig or trench

30
Q

asphalt cutter

A

used win demo hammer when removing asphalt

- operator can make long straight cuts

31
Q

tamping bit

A

can pack down soil or loose gravel

32
Q

Handheld saw

A

saw is brought to the material and held by hand

33
Q

bench top saw

A

saw is mounted on surface

34
Q

walk behind saw

A

operator steers the saw while walking

35
Q

Abrasive disks

A

for handheld concrete or metal cutting disks

36
Q

sub abrasive disks

A

use diamond impregnated metal blades or cubic boron nitride blades. used to cut tile, stone, asphalt, concrete

37
Q

angle grinder

A

used to smooth concrete surfaces and to cut off exposed steel

38
Q

types of metal grinding wheels

A

ferrous metal wheels (cast- iron, steel)
non ferrous metal wheels ( brass, copper, aluminum)
cutt off wheels (zipdisks)

39
Q

size of router

A

two factors ( horsepower of the motor and the maximum shank diameter

40
Q

Collet nut

A

holds the bit securely to the router

41
Q

guid bearing router

A

many bits equipped with bearings that guid bit a certain distance from material.

42
Q

straight flute bit

A

cuts plow or dado in wood

43
Q

Laminate bit

A

used to trim finished edge of laminate counter tops can also be used of edges of wood

44
Q

Chamfer bit

A

buts a 45 degree bevel on edge of board

45
Q

Bullnose bit (Router)

A

used to round the edge of boards and trim

46
Q

Ogee bit

A

ogee bit is used to put an ogee on the edge of a board ogee shape curves one way and then the other

47
Q

dovetail bit

A

using a jig can make a decretive and strong dovetail joint

48
Q

cove bit

A

used to but cove (inside curve)

49
Q

Router bit speed

A
Bit Diameter      Max Router speed 
up to 25mm -> 24000 rpm
25-32mm     -> 18000 rpm
32-57mm     - > 16000 rpm
57 - 89mm   -> 12000 rpm
50
Q

templates

A

used with routers to cut specific holes

51
Q

guide bushings

A

when using a guide bushing the gap between the router and the outside edge of bushing must be considered when making the template

52
Q

Belt sanders

A

used to smooth faces of wood. measured by the width of of sander.

53
Q

Disk sanders

A
  • used for shaping curved surfaces
  • or sanding edges of wood
  • ## remove old finish
54
Q

orbital sander

A
  • (palm sanders) orbit around 14000 rpm
  • ## use standard sand paper
55
Q

multi master

A

use triangular sanding pad

can reach into tight corners

56
Q

sandpaper

A

three different grits are used when sanding woods
course: 30-50
medium grit : 60-100
fine grit: 120-180

57
Q

Portable biscuit (plate) joiners

A

used when building cabinets shelving or furniture

58
Q

biscuit adjustment size

A

the depth of the saw kerf is reduced for the smaller biscuits and increased for larger

59
Q

double biscuit

A

can be created when working with wood that is at least 1” thick
should be at least 3/16 between material and biscuit