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M7 E > M7.3 > Flashcards

M7.3 Flashcards

1
Q

How do you attempt to reduce parallax error?

A

Your observing eye should be as near as possible

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2
Q

Why should you never use a lead pencil on titanium?

A

Because the carbon can infuse the metal and cause cracking

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3
Q

Why cant you use normal lead pencil on aluminium alloy?

A

Because it introduces graphite into the material causing corrosion

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4
Q

What is the angle of a centre punch?

A

60 degrees

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5
Q

When sawing how many teeth should be in contact with the material?

A

More than one

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6
Q

What is the pitch of a saw bade?

A

Tooth to tooth

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7
Q

What are the three types of saw blades?

A
  • coarse
  • medium
  • fine
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8
Q

Why is the slot of a saw blade thicker than the blade?

A

To stop it from binding (known as clearance or kerf)

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9
Q

What are the four types of files?

A

-single cut (smooth)
-double cut (second)
-rasp cut (bastard)
-dreadnought (rough)
(Grades of cut)

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10
Q

What is pinning of a file?

A

Clogging of the teeth

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11
Q

What are drills made it of?

A

Carbon steel or high speed steel

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12
Q

What is the lip angle of a drill bit?

A

Half the included angle

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13
Q

What is the included angle of a drill bit?

A

118 degrees

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14
Q

What is the taper called on taper shank drill?

A

Morse taper

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15
Q

For very hard metals what is the included angle of the drill?

A

140 degrees

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16
Q

What can the included angle be dropped to for soft metals?

A

40 degrees

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17
Q

What is the most common drill for sheet metal?

A

Pneumatic or air drill

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18
Q

What is another name for the flat offset driving head?

A

Pork chop

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19
Q

What does a drill stop do?

A

Regulates the hole depth and cushions the break through

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20
Q

What is the job of the drill guide?

A

It keeps the drill at 90 degrees to the skin surface

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21
Q

What is boelube?

A

Is an agent for drilling aluminium, magnesium, steel, titanium

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22
Q

How long after using should boelube be removed?

A

Within 48 hours

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23
Q

What is tolerance?

A

The difference between the maximum and minimum sizes

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24
Q

What are the three types of fit?

A
  • clearance fit
  • interference fit
  • transition fit
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25
Q

What are the limits called on a tolerance?

A

Upper and lower limits

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26
Q

What are the two types of system fits?

A
  • hole basis system (hole size is fixed and shift varied)

- shaft basis system (shaft size is fixed and the hole is varied)

27
Q

What do reamers do?

A

I larger the hole and helps Improve the quality

28
Q

What are reamers made from?

A

Carbon tool steel or high-speed steel

29
Q

Why should you always rotate a reamer in the cutting direction?

A

To avoid chipping as it is very brittle

30
Q

What is the main advantage of a left-hand twist reamer over a right-hand?

A

It wont pull itself into the hole

31
Q

What is chatter?

A

When the tool or work has been vibrating during cutting which produces uneven cuts

32
Q

What are the two types of reamers?

A

Hand and machine reamers

33
Q

How do you adjust the expansion hand reamer?

A

By tightening a taper screw into the opening

34
Q

What is reaming speeds?

A

The speed of chip removal

35
Q

What are the angles of countersink?

A
  • 82
  • 100 (most popular)
  • 120
36
Q

What does a micro stop countersink do?

A

Controls the depth of the countersink cut and helps keep it perpendicular

37
Q

Why are back countersinking tools used?

A

When countersinking holes that are inaccessible

38
Q

What is spotfacing?

A

When you need to cut a flat are into an uneven surface

39
Q

What is the angle for a ISO metric / unified imperial Series thread?

A

60 degrees

40
Q

What is the angle for a American national thread and DIN metric thread?

A

60 degrees

41
Q

What is the angle for whitworth thread?

A

55 degrees

42
Q

What is the angle for British association thread?

A

47.5 degrees

43
Q

What is the job of the stock in hand threading?

A

To hold and tun the threading die

44
Q

What is the job of a die in hand threading?

A

To cut the thread onto the tube

45
Q

What is the tap wrench used for?

A

Holding the tap

46
Q

What are hand taps used for?

A

To cut the tread into the hole

47
Q

What are the three types of taps?

A
  • taper (1)
  • intermediate (2)
  • bottoming (3)
48
Q

What is torque?

A

The amount of rotational force applied when tightening a fastener

49
Q

What is used to prevent over tightening a fastener?

A

A torque wrench

50
Q

What are the three types of torque wrench?

A
  • deflecting beam (uses a pointer)
  • torsion bar (uses a dial)
  • toggle bar (uses pre-sett torque)
51
Q

What effects does lubrication have on a torque wrench?

A

It’s gives a false torque reading and. Normally over tightens

52
Q

How often should torque wrenches be calibrated?

A

Depending on use every week, 6 months, annually

53
Q

How do you check or readjust a micrometer?

A

By using a standard or gauge block

54
Q

What is the job of a three point internal micrometer?

A

To give more accuracy to internal measurements

55
Q

What is the job of depth micrometer?

A

To measure the depth relative to the base plate

56
Q

What are most abrasive wheels made out of?

A

Silicon carbide

57
Q

What are mineral oils derived from?

A

Crude oil (extracted from underground)

58
Q

What are synthetic derived from?

A

Chemical reaction

59
Q

Can you mix lubricants?

A

No

60
Q

Where should lubricants be stored?

A

In lockers and areas to minimise fire because they’re volatile

61
Q

How is an aircraft automatically grounded?

A

Via the nose landing gear

62
Q

How long are the cables on a bonding testing kit?

A

60 and 6 feet

63
Q

On a bond testing kit where should the 60 foot cable go?

A

To main earth (bond datum point)

64
Q

How do you test for a concealed break in a cable?

A

By using a continuity tester

M7 E (14 decks)

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