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Kemble > 7.3 Sippo Questions > Flashcards

7.3 Sippo Questions Flashcards

1
Q

When using a hacksaw how many teeth must be in contact with the metal being cut at any on time

A

More than 1

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2
Q

What technique is used to produce a good cut with a hacksaw

A

Start by holding the saw at an angle
Forward stroke under pressure
Return stroke without pressure
Near end before material separates reduce pressure on saw

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3
Q

What has to be remembered when fitting normal hacksaw blades and junior hacksaw blades

A

On normal - teeth must point in cutting direction
Junior - teeth facing towards handle

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4
Q

What prevents the hacksaw blade from binding in the material when being used

A

As it cuts into material the slot it created must be greater than the blade thickness. - must cut required clearance.
By:
Teeth are set
Blade is waved

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5
Q

What is meant by a double cut file

A

Has two sets of teeth overlaid at 45degrees to each other for faster material removal

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6
Q

Apart from double cut what are the other cuts of file

A

Single cut - for soft material and fine finishes
Rasp cut - wood and leather
Curved tooth - dreadnought for smooth finished on aluminium or removing large amounts of material on soft materials

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7
Q

What safety precautions must be observed when using files

A

Always use a handle on a file

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8
Q

Where should a bench vice be in conjunction to your body

A

5-8 cm below you elbow

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9
Q

What is the purpose of draw filling

A

For final finish
Usually used on parts that are relatively long
Used to get a fine surface to prevent crack growth

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10
Q

What is the purpose of flutes in a drill

A

Helical grooves provide cutting lips which permit the removal of chips and allow cutting fluid to reach the cutting lips

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11
Q

Where is the body of a drill bit

A

The part between the point and the shank. Including spiral flutes, lands and the margin

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12
Q

Why is it important for the body of a drill bit to be slightly tapered

A

Means it is fractionally larger in diameter at the tip then at the shank, therefore causing it to bore a hole with clearance to prevent the drill from binding

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13
Q

What type of drill best lends itself to sheet metal work

A

Jobber drill

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14
Q

How is a taper shank drill fitted to a drill motor

A

At the end of taper shank there is a tongue, called tang. And when taper shank is fitted into the socket spindle the tang engages in a slot

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15
Q

What is the drill point angle for general purpose drilling

A

Should be sharpened to a cone of 118 degrees (lip angle 59degrees)

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16
Q

What are the drill point angles for hard materials and soft materials,

A

Angles of 140 degrees are for hard materials
Angles of 80degrees are for soft materials

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17
Q

What does a pillar drill make possible

A

Precision drill work. As no play I’m spindle, bearing or chuck. And clamped

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18
Q

What are the advatange of using pneumatic drills in aviation

A

Less hazardous than having electrical cables on a crowded plane
Control offered by air drills. - varying trigger

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19
Q

What may be used to prevent a drill from penetrating too far into a structure when drilling

A

Drill stop

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20
Q

What are the three probable causes of a drill that won’t feed into the material

A

Drill blunt
insufficient drill cutting clearance
Drill too large (pilot hole needed)

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21
Q

Why does drilling of thin plate require special care

A

The drill point often breaks through before the drill has cut its full diameter

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22
Q

What clamping devices may be used when hand drilling

A

Angle vices, pin vices, hand vices

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23
Q

What is the purpose of a drill guide

A

The hand held drill guides keeps the drill 90 degrees to the skin surfaces.

24
Q

How is a hole finder used

A

When replacing an old skin with a new one. If no pilot holes drilled in new skin.

The finder resembles a clamp that slips over the new skin and on its underside is a pin that exactly fits through the hole in structure. This guides the drill in making a new hole in new skin that aligns with the old one.

25
Q

What’s the advantage if using a drill agent

A

Improves hole life
Hole tolerance hole finish
(Shown in AMM if allows and what one)

26
Q

What should be taken into account when drilling hard materials in comparison to soft materials

A

Drill speeds (revolutions per minute)
Hard materials should be drilled slower

27
Q

What are the two systems of fits

A

Hole base and shaft base

28
Q

Describe what reaming is

A

Process which a fluted tool is used to enlarge a drilled hole.

A hole that is to be reamed is drilled 1/32 inch under the finished hole size

29
Q

How could you determine wether or not a reamer will produce a hole of the correct tolerance

A

Test it in scrap materials

Reamer generally produce a hole that is 0.001 inch larger than exact size of reamer

30
Q

What are the common factors that affect the size of the reamed hole

A

Pilot hole
Hardiness of material
Amount of material being removed by reamer
Speed of reamer
Rate of feed (pressure)
Sharpness of reamer
Amount or type of lubricant

31
Q

How many different types of flute are there on a reamer and what are they

A

Straight and spiral flutes

32
Q

What are the benefits of using a pilot check reamer

A

Gives accurate lead into a drilled hole and superior finish

33
Q

Expansion hand reamers may be used on high tolerance aircraft parts instead of solid reamers
True or False

A

False as this could cause the danger of oversized holes

34
Q

What are likely causes of oversized reamed holes

A

Hand expansion reamers
Inadequate work support
Worm guide bushings
Bent reamer shank
Trying to straighten the reamer if bent

35
Q

In relation to countersinking what is knife edging

A

Sheet metal should not be countersunk all the way through else knife edging which could result in cracking (see SRM for minimum sheet thickness)

36
Q

What countersink angles are likely to be encountered in aviation

A

82, 100,120
With 100 being the most common

37
Q

What’s the purpose of a microstop countersink tool

A

Fitted with removable cutter and pilot.
Controls countersink depth and keeps work perpendicular to work surfaces

38
Q

What device is used to countersink inaccessible holes

A

Back countersinking

39
Q

What is spot facing

A

Used for cutting a flat area or seat for a bolt head or nut on a contoured or uneven surface

40
Q

What situations should you allow for extra depth when adjusting a microstop countersink

A

Because countersinking is done through skin tape or protective spray coating. Allow for added thickness

41
Q

What are the two series of an ISO thread form

A

United national fine UNF
United national coarse UNC

42
Q

What was a commonly used thread form

A

Whitworth thread form

43
Q

What is the thread form used in electrical fitting and scientific apparatus

A

British association thread

44
Q

What does a regular hand tap set consist of

A

Taper, intermediate and bottoming tap

45
Q

What is the essential element for successful tapping

A

Holes are the correct size and condition

46
Q

When using torque wrenches what has to be taken into consideration.

A

If the threads are wet or dry
The AMM stipulates the torque loading for both

47
Q

Does a wet or dry thread require more torque loading

A

A wet thread requires more torque to be applied

48
Q

If using an extension with a torque wrench what do you have to remember

A

It’s length must be taken into consideration
Because torque values on a deflecting beam or torsion will be taken from the centre of the square drive

49
Q

What is the benefit of synthetic oil over mineral oil

A

Synthetic oils are manufactured by chemical reactions and can produce consistent quality.
Whereas mineral oils can contain some impurities, less pure and less thermally stable

50
Q

What is the problem with putting a synthetic oil in a mineral system and visa versa

A

Lubricants should not be mixed.
Putting the wrong lubricant can break down a seal, destroying its effectiveness.
Therefore should always be clearly marked and check AMM

51
Q

How is a micrometer tested during routine calibration

A

Using a standard gauge block that is manufacturers to a very close tolerance (has calibration itself)
Then gauge block inserted between anvil and spindle - then closed.
Tool then adjusted to zero mark on thimble until exactly coincides with the sleeve datum line

52
Q

When using a micrometer what should be used to turn the thimble

A

Ratchet stop

53
Q

How many different types of measurements can be taken away with a venier calliper and what are they

A

Imperial and metric
External, internal and depth

54
Q

What is the most common vernier calliper and what is its range of accuracy

A

1/20 or 0.05mm

55
Q

When grinding with an abrasive wheel why should you not grind on the side of the wheel

A

A groove can form over time, creating a weak point that has in the past led to wheels exploding

56
Q

What maintence practises occasiaonally need to be performed on punches

A

Deburring of striking face

Kemble (39 decks)

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