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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
What are the limits called on a tolerance?
Upper and lower limits
26
What are the two types of system fits?
- hole basis system (hole size is fixed and shift varied) | - shaft basis system (shaft size is fixed and the hole is varied)
27
What do reamers do?
I larger the hole and helps Improve the quality
28
What are reamers made from?
Carbon tool steel or high-speed steel
29
Why should you always rotate a reamer in the cutting direction?
To avoid chipping as it is very brittle
30
What is the main advantage of a left-hand twist reamer over a right-hand?
It wont pull itself into the hole
31
What is chatter?
When the tool or work has been vibrating during cutting which produces uneven cuts
32
What are the two types of reamers?
Hand and machine reamers
33
How do you adjust the expansion hand reamer?
By tightening a taper screw into the opening
34
What is reaming speeds?
The speed of chip removal
35
What are the angles of countersink?
- 82 - 100 (most popular) - 120
36
What does a micro stop countersink do?
Controls the depth of the countersink cut and helps keep it perpendicular
37
Why are back countersinking tools used?
When countersinking holes that are inaccessible
38
What is spotfacing?
When you need to cut a flat are into an uneven surface
39
What is the angle for a ISO metric / unified imperial Series thread?
60 degrees
40
What is the angle for a American national thread and DIN metric thread?
60 degrees
41
What is the angle for whitworth thread?
55 degrees
42
What is the angle for British association thread?
47.5 degrees
43
What is the job of the stock in hand threading?
To hold and tun the threading die
44
What is the job of a die in hand threading?
To cut the thread onto the tube
45
What is the tap wrench used for?
Holding the tap
46
What are hand taps used for?
To cut the tread into the hole
47
What are the three types of taps?
- taper (1) - intermediate (2) - bottoming (3)
48
What is torque?
The amount of rotational force applied when tightening a fastener
49
What is used to prevent over tightening a fastener?
A torque wrench
50
What are the three types of torque wrench?
- deflecting beam (uses a pointer) - torsion bar (uses a dial) - toggle bar (uses pre-sett torque)
51
What effects does lubrication have on a torque wrench?
It’s gives a false torque reading and. Normally over tightens
52
How often should torque wrenches be calibrated?
Depending on use every week, 6 months, annually
53
How do you check or readjust a micrometer?
By using a standard or gauge block
54
What is the job of a three point internal micrometer?
To give more accuracy to internal measurements
55
What is the job of depth micrometer?
To measure the depth relative to the base plate
56
What are most abrasive wheels made out of?
Silicon carbide
57
What are mineral oils derived from?
Crude oil (extracted from underground)
58
What are synthetic derived from?
Chemical reaction
59
Can you mix lubricants?
No
60
Where should lubricants be stored?
In lockers and areas to minimise fire because they’re volatile
61
How is an aircraft automatically grounded?
Via the nose landing gear
62
How long are the cables on a bonding testing kit?
60 and 6 feet
63
On a bond testing kit where should the 60 foot cable go?
To main earth (bond datum point)
64
How do you test for a concealed break in a cable?
By using a continuity tester

M7 E (14 decks)

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