2A753 Volume 1

Front 1

if you had to select an aluminum alloy that is high in strength without a substantial loss in workability, which alloy should you select?

Back 1

5052

Front 2

what type of hammer do you use for double seaming lids?

Back 2

setting

Front 3

what type of punch do you use to align fastener holes in two pieces of metal?

Back 3

drift

Front 4

how many teeth per inch are recommended on a hacksaw blade when you're cutting solid stock aluminum?

Back 4

18

Front 5

how many teeth per inch are recommended on a hacksaw blade when you're cutting thick wall tubing?

Back 5

24

Front 6

if the metal being bent is within the capacity of the machine, what adjustment is required when the bar folder is hard to operate?

Back 6

thickness

Front 7

when you're hand-forming an angle by shrinking, the flage tends to

Back 7

buckle at the bend

Front 8

where on an angle do you start hammering when forming a flange by stretching?

Back 8

near the ends, working gradually towards the center

Front 9

when hand-forming flanges, the wedge block helps keep the edge of the metal perpendicular to the form block, lessens the possibility of splitting or cracking the metal, and

Back 9

aids in removing buckles

Front 10

a metal that can withstand tearing or shearing, and that may be stretched or otherwise deformed without breaking has a high degree of..

Back 10

toughness

Front 11

the coefficient of thermal expansion for magnesium alloys is critical in the temperature range from:

Back 11

70 to 212 degrees

Front 12

the american society for testing materials' nomenclature system, which is used exclusively in designating magnesium and magnesium alloys, shows the principal alloy elements by the:

Back 12

first 2 letters

Front 13

if a TO repair figure specifies a material of society of automotive engineers 1030 steel, what is the main alloying element, and what percentage of that element does the steel contain?

Back 13

carbon; 0.3

Front 14

to properly cold-bend a soft material magnesium alloy that has been annealed, the bend radius should be at least equal to how many thicknesses of the metal being bent?

Back 14

seven

Front 15

when you must saw thin, light, corrosion-resistant steel with a hand-held hacksaw, the number of teeth per inch on the blade should be

Back 15

32

Front 16

the factors you should consider when substituting metals are strength, corrosion resistance,

Back 16

weight and contour

Front 17

to locate a specific point on a blueprint, you use

Back 17

zone numbers and letters

Front 18

why is a center punch used instead of a prick punch to locate the centers of holes to be drilled

Back 18

angular degrees of shapness in points

Front 19

why should the cutting direction be counter-clockwise when using straight snips to cut out a circle

Back 19

right handed use

Front 20

why type of file is used for filing cutters and taps

Back 20

mill

Front 21

when should you use a slight pressure on the back stroke when filing

Back 21

soft metal for cleaning

Front 22

how should material for crossfiling be positioned in a vise

Back 22

parallel to the top

Front 23

what is the main precaution to remember when using a file

Back 23

never oil/ long smooth strokes

Front 24

when sharpening a chisel what may soften it and cause it to loose hardness

Back 24

pressing too hard generates heat

Front 25

why is it necessary for a hacksaw blad to have "set"

Back 25

to provide clearance for the rest of the blade in the saw cut

Front 26

what are the 3 types of blade set

Back 26

alternatie raker undulated

Front 27

what must you do before operating a power-operated squaring shear

Back 27

check the data plate

Front 28

why is the reciprocating saw able to cut almost any shape of cutout

Back 28

adjustivle collar

Front 29

what factor determines the size of the inserts used on the guide blocks of a contour metal cutting saw

Back 29

the blade width

Front 30

when you inspecty the saw blad ebefore operating a contour metal cutting saw what should you look for

Back 30

dullness, insoficent set, broken teeth, faulty welds

Front 31

if you must grind cast-iorn materials which type of grinding wheel is recomended

Back 31

silicone carbide

Front 32

what are 2 types of sanding discs

Back 32

pre glued or glue required

Front 33

on the belt sander what are the parts that require removal to replace the belt

Back 33

side and top covers

Front 34

how is the belt on a belt sander adjusted

Back 34

rotate screws on top

Front 35

give 2 situations to use a hand drill

Back 35

one or 2 holes to be drilled or less time than setting up pneumatic

Front 36

how can you tell when the v-belt on a drill press is adjusted properly

Back 36

correct speed

Front 37

what part of a twist drill does the actual cutting

Back 37

lips

Front 38

what is sumetimes called the backbone of a twist drill

Back 38

web

Front 39

what physical property of remers makes it necessary that they are handled carefully at all times

Back 39

harden to point of being brittle

Front 40

why are bottom reamers used

Back 40

complete reaming of blind holes

Front 41

for general use which type of reamer is the most practical

Back 41

expansion

Front 42

why do dimpling dies have an included angle of 5 degrees less than that of the rivet being installed

Back 42

allows for metal springback

Front 43

what is the major difference between radius and coin dimpling

Back 43

slidng ram of coin dimpling

Front 44

why are the dimpling dies used for coin dimpling dished

Back 44

facilitates removal of metal after dimpling is done

Front 45

why is hot dimpling recommended for 2024-t aluminum

Back 45

cold dimpling may cause cracking

Front 46

why is cres cold dimpled

Back 46

temp of heating unit not high enough to dimple hot

Front 47

what is the largest depth flange you can make on a bar folder

Back 47

1"

Front 48

what is the largest depth flange you can make on a cornice brake

Back 48

as wide as the depth of the jaws

Front 49

if the bending leaf on a cornice brake is properly adjusted what should the clearnances be at the center and ends

Back 49

center 1/32" ends 1/64"

Front 50

how can you check to ensure the bending leaf is not bowed

Back 50

center is checked with a straight edge

Front 51

what happens to the flange when the movements of the jaws on a shrink/stretch machine move inward

Back 51

shrink

Front 52

what is the procedure for feeding the work to ensure effective forming when using a shirnking and streching machine

Back 52

enter work to centerline of jaws work out equal distance

Front 53

what should you always ensure before you press a part

Back 53

the ram cna pass evenly between the v blocks

Front 54

when pressing an anti-friction bearing where on the bearing should you place the ram

Back 54

squarely on the face of the bearing

Front 55

what type of hardwood material is recommended for fabricating form blocks when forming aluminum

Back 55

maple and ash

Front 56

what type of stake is used to rivet pipes and elbows

Back 56

conductor

Front 57

what stake is used to supprt when laying down double seams on small cylindrical objects

Back 57

double seaming (simple)

Front 58

the candle mold stake is generally used for

Back 58

tube forming

Front 59

the roundhead stake is generally used for

Back 59

forming irregularly shaped objects

Front 60

which stake is used to make straight line bends

Back 60

hatchet

Front 61

how can you enusre you wont overform a flange when your stetching an extruded angle on a v-block

Back 61

form gradually and evenly by moving strip back and forth whilst distributing hammer blows at equal spaces

Front 62

why is the v bock method of shiriking a flange prefered over the shrinking block method

Back 62

faster, easier, and affects the metal less

Front 63

if you are using a v-block to shrink a flange in what direction do you point the flange to be shrunk

Back 63

up

Front 64

if you form a flanged angle with the flange pointed toward the inside of the bend what must you do the metal on the flange

Back 64

shrink

Front 65

what effect ahs the material comosition of the form block on the type of hammer used

Back 65

hardwood = metla plansishing hammer
metal = soft faced mallet

Front 66

when forming curved parts why is the concave curve formed first

Back 66

to help keep flange from splitting or cracking

Front 67

why is it required that the hold-down plate used during bumping should be just tight enough to hold the material flat against the face of the form block

Back 67

it will bend up or buckle away from the block

Front 68

how much metal should you allow for drawing when forming by bumping dies

Back 68

1/2-1"

Front 69

where should you start hammering when using die blocks

Back 69

down from edges

Front 70

what guidance is used to determine equipment lubrication requirements

Back 70

air force directives or approved commerical data

Front 71

what section fo the industrial support equipment record documents scheduled inspections

Back 71

section 3

Front 72

what property permits it to be hammered into various shapes without breaking

Back 72

malleabliity

Front 73

what happens to metal with a high coefficent of thermal expansion

Back 73

warps considerably when heated

Front 74

list 3 ways to reduce or preven corrosion in metal

Back 74

better grades base metal, coating surface with paint, anodizing

Front 75

if the metal you have selected is very brittle which selection factor did you overlook

Back 75

worability

Front 76

what effect does cold working have on tensile strength of a metal

Back 76

directly proportional, hardness increases tensile strength increase

Front 77

shear strength is what percent of tensile strength

Back 77

60%

Front 78

where does the greatest stress occur when your bending a peice of metal

Back 78

at the neutral axis

Front 79

why is soldering of aluminum joints difficult

Back 79

oxidation of surface pervents soft solder from adhering

Front 80

what element increase the probability of corrosion in aluminum

Back 80

copper

Front 81

whats the basic differnce between permanet modl casting and die casting

Back 81

permanet mold metal flows by gravity into die, die casting metal is forced inot die by pressure

Front 82

the amount of alclad coating on wroght aluminum sheets depends on what factor

Back 82

depends on percent of thickness

Front 83

what process are used to develop -t6 alluminum

Back 83

heat treated and artificually aged

Front 84

what do federal sepc numbers indicate

Back 84

refer to document estabilishes the amount of materials incorporated into the production of a particular alloy desred

Front 85

if you must replace 2024 with another copperalloyed aluminum which should you select

Back 85

2014

Front 86

which aluminum is used in the fabrication of most aircraft rivets

Back 86

2017

Front 87

how does 7075 differ from the other high strength alloys

Back 87

zinc is the main element

Front 88

what happens to titanium if exposed to high temeratures

Back 88

oxygen diffuses into metla and brittleness and corrosion occur

Front 89

which titanium alloy classifaction cant be heat treated

Back 89

c-alpha beta

Front 90

which titanium classification is highly vulnerable to contamination

Back 90

b-beta

Front 91

which to has information on the designation and identification of titanium

Back 91

1-1a-9

Front 92

magnisum is suseptible to what type of corrosion

Back 92

salts and galvanic

Front 93

what cast magnisum alloys are used where temeratures exceed 650

Back 93

magnesium-thorium

Front 94

why do magnesium alloys containg thorium need special handling

Back 94

1010 level radioactivity

Front 95

whats the rule for spacing spec markings on magnesium extrusions

Back 95

intervals of 2ft or less

Front 96

whats the main differnce between sae numbering and aisi coding systems

Back 96

prefex aisi number indicates process used

Front 97

why are specs given in ams and astm codes

Back 97

complete procurment specs for materials used in asm

Front 98

state the three classifications of carbon steel and the percentage range of each class

Back 98

low 10-30 medium 31-50 high 51-105

Front 99

which nickle based alloy is the most outstanding in corrosion resistance at high tempers

Back 99

cobalt

Front 100

moybdenum steels are especially adaptable to what metal working process

Back 100

welding

Front 101

what spiral angle for twist drills provides good results when drilling aluminum alloys

Back 101

47 degrees

Front 102

why is a noisy bandsaw more efficient than a quiet smooth cutting blade

Back 102

quiet saw produces smooth burnished surfaces accompanied by excessive heat and decreased blade life

Front 103

what type of blade set is recommended for cutting aluminum alloys with a hacksaw

Back 103

wavy set with 5-15 teeth/inch

Front 104

what is the maximum sheating blade clearance for magnesium

Back 104

3-5% of sheet thickness

Front 105

how many teeth per inch are required on a saw blade when sawing small to medium magnesium extrusions

Back 105

6 teeth per inch

Front 106

how does the power requirement for magnesium-working equipment compare to the power required for working mild steel

Back 106

1/6th required of mild steel

Front 107

how muc larger must the bend radius be for cold-forming hard magnesuim alloys as compared to the bend radius requried to cold form soft magnesium alloys

Back 107

7 times thickness soft
12 times thickness hard

Front 108

what type twist drills are commonly used to drill stainless steel

Back 108

high speed

Front 109

the clearance between the blades on a squaring shear used to cut steel is directly related to what particular feature of the metal being cut

Back 109

1/20th of the thicknss

Front 110

why is it nessarcy to check the specific -3 to before selecting a subsitute metal

Back 110

because different manufactures design structual members to meet various load requirments for specific aircraft

Front 111

whats the name of the longest horizontal dimention of a plane figure

Back 111

length

Front 112

what type of line is represented by a series of short unifrom dashes

Back 112

invisible/hidden surface

Front 113

how do extension lines differ from dimension lines

Back 113

arrow heads on end of dimmention lines

Front 114

what is the purpose of crosshatch lines

Back 114

indicate 2 separate parts meet at 1 point

Front 115

often, isometric drawings are used with what other type drawings

Back 115

orthographic

Front 116

what objects are best presented by oblique drawings

Back 116

objects w/irregular outlines

Front 117

what is meant by mold point

Back 117

point of intersection of lines from outside surface (overall dimension)

Front 118

why is bend allowance calculated along the neutral axis of a piece of metal

Back 118

stretching/shrink have no effect along it

Front 119

whats the difference between degree of bend and radius of bend

Back 119

radius messured inside
degree formed position of material