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M7 > 7.3 > Flashcards

7.3 Flashcards

1
Q

What can rules and scales be made of?

A

Tempered carbon steel or satin finished stainless steel?

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2
Q

What material should you never use a lead pencil on?

A

Titanium. The carbon can infuse the metal when heated and cause cracking.

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3
Q

What angle is a centre punch?

A

60 degrees

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4
Q

What materials are coarse saws for?

A

Soft materials

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5
Q

What is Kerf Clearance

A

The slot the saw cuts is bigger than the blade thickness (waved blade)

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6
Q

How many teeth in coarse, medium and fine saws?

A

14,22,32

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7
Q

What angles are triangular files for internal diameters limited to?

A

60 degrees

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8
Q

What are the 4 file cuts?

A

Single
Double
Rasp
Dreadnought

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9
Q

What are the 4 grades of cut?

A

Smooth
Second cut
Bastard
Rough

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10
Q

How far should the bench vice be below your elbow?

A

5-8cm (2-3 inches)

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11
Q

How should be pressure be applied on very soft materials?

A

Forward and back stroke

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12
Q

What is pinning?

A

The clogging of the file teeth

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13
Q

How do you prevent pinning?

A

Applying chalk, white spirit or oil

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14
Q

What are drills made of?

A

High speed steels (HSS) or carbon steels

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15
Q

What steel is more economical for drills?

A

HSS

Carbon steels overheat and lose their hardness when drilling very tough material (but cost less)

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16
Q

What are the twist drill angles?

A

Lip relief= 12-15 degrees

Lip angle= 59 degrees

Included angle= 118 degrees

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17
Q

What is the land for twist drills?

A

The peripheral portion of the body between adjacent flutes.

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18
Q

What’s the most common twist drill?

A

Jobbers drill

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19
Q

How many flutes do twist drills have?

A

1-4

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20
Q

What is the taper called for taper shank drills?

A

Morse taper

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21
Q

What should be used with an extension drill?

A

Drill guard

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22
Q

What sizes do machine spindles come in?

A

8 sizes numbered 0-7

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23
Q

What angle is often used for extremely hard materials?

A

Lip angle= 70 degrees

Point angle= 140 degrees

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24
Q

What cutting angle can be used for soft materials or fibres?

A

40 degrees

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25
Q

What drilling angle for stainless steels or titanium?

A

140 degrees

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26
Q

What angle for plastic drilling?

A

30 degrees shallow holes

Up to 70 degrees very deep holes

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27
Q

For standard aluminium alloys, what satisfactory angle?

A

135 degrees

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28
Q

What’s the metal at the centre of the drill called?

A

The web

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29
Q

What should the drill speed be limited to for drills longer than 3 inches?

A

6000 rpm

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30
Q

What angles are available for angle drill motors?

A

30, 45, 90 (limited access places)

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31
Q

What is a flat offset drilling head also known as?

A

Pork chop

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32
Q

What is wrong with the speed of drilling if the corners wear away too fast?

A

Too high

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33
Q

What should very hard steel be cut with?

A

Kerosene or turpentine

34
Q

What should be drilled to stop a crack?

A

1/4 inch counterbore

35
Q

What does a drill guide do?

A

Keeps the drill 90 degrees to skin surfaces.

36
Q

What is the nut plate drill jig known as?

A

Anchor nuts

37
Q

What numbers and letters are used for drill gauge sizes?

A

80-1

A-Z

38
Q

Why is Boelube good?

A

Non corrosive and paint compatible
Removed easily with warm water
Non toxic
Compatible with most systems

39
Q

When should Boelube residue be removed?

A

Within 48 hours of use

40
Q

When would a shaft basis system fit be used?

A

Bearing and gears where a variety of components need to fit one shaft.

41
Q

How does the ISO system of fits work?

A

H upwards smaller the hole

h upwards bigger the shaft

42
Q

What is the standard for ISO system of fit?

A

British standard 4500

43
Q

What are reamers for?

A

Improve the quality of hole and provides closer control of drilling hole size.

44
Q

How big should a reamed hole be drilled out before?

A

1/32 under finishing hole size

45
Q

What are reamers made out of?

A

High speed steel or carbon steel

46
Q

What do spiral fluted reamers do which straight fluted do not?

A

Do not tend to chatter and must be used when cutting reamed holes that have key ways

47
Q

What are bottoming reamers for?

A

Complete reaming of blind holes

48
Q

What do right hand twist spiral fluted reamers do?

A

Removal of chips affected like normal drill.

49
Q

What do left hand twist reamers do?

A

Move chips in advance direction. Does not pull the drill into the hole

50
Q

What are left hand twist reamers only good for?

A

Transmissions

51
Q

How are reamers made to reduce vibration?

A

Uneven spacing

52
Q

How do you remove a reamer?

A

In the same direction as the cutting direction.

53
Q

What is the advantage of machine reamers?

A

Higher cutting capacity and dead centre holes.

54
Q

Why is the pilot chuck reamer the most commonly used?

A

Accurate lead into the hole and a superior finish

55
Q

When is an expansion hand reamer used?

A

When a hole needs cutting a few thousandths of an inch over nominal size for fit purposes

56
Q

Which reamer is threaded it’s entire length?

A

Hand taper reamer

57
Q

What’s used to countersink inaccessible holes?

A

Back countersink

58
Q

What is spotfacing?

A

The method for cutting a hole for a bolt head on an uneven surface.

(Use a pilot 1/32 inch under hole size)

59
Q

What are the most common threads used on aircraft?

A

DIN Metric and American National

60
Q

How is a thread measured below 1/4 inch?

A

Numbers between 0-12

61
Q

What parts make up the hand threading tool?

A

Stock and die

62
Q

Why does the die of a hand threading tool have 3 or more flutes?

A

Form cutting edges on the internal thread.

63
Q

What do regular hand tap sets consist of?

A

Taper, intermediate and bottoming taps.

64
Q

What is a torque wrench measured in?

A

Inch-pounds or foot-pounds

65
Q

What are the 3 types of torque wrench?

A

Deflecting beam, torsion bar and toggle

66
Q

What torque wrench has a pre determined torque set?

A

Toggle

67
Q

How frequent must torque wrenches be calibrated if in frequent use?

A

Weekly

68
Q

How much can lubrication and frequent affect a torque reading?

A

25%

69
Q

What is a torque wrench accurate to?

A

+-2%

70
Q

What’s the accuracy of a micrometer?

A

0.01mm

71
Q

How much of an abrasive wheel is encased in a wheel guard?

A

3/4

72
Q

Why are lubricants used?

A

Prevent heat build up and increase efficiency.

73
Q

What is hydrofinishing for?

A

Remove impurities and make oil brighter.

74
Q

Why are synthetic oils more advantageous than mineral oils?

A

Less impurities, more molecularly pure and more thermally stable

75
Q

What bearings and bushings should not be lubricated?

A

Teflon

76
Q

What is the max pressure for applying lubricants?

A

2500psi

77
Q

What is suitable pressure for lubrication?

A

100-200psi

78
Q

What is bonding?

A

The electrical interconnection of metallic parts and for the safe distribution of electric charges and currents.

79
Q

What are used for bonding connections in high vibration areas?

A

Braided copper or aluminium cords

80
Q

What does a continuity tester consist of?

A

Low voltage battery (2.5 volts) and a test lamp

81
Q

When should a millivolt drop test be carried out?

A

If there is excessive resistance,… low terminal voltage at connections and heating at conductor joint.

82
Q

What length show a drill stop be set to in reference to the material?

A

Material thickness + .10 inch

M7 (17 decks)

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