7.3.9 Drilling Flashcards

1
Q

What is the primary tool used for drilling in airframe structural work?

A

Portable drills (electric or pneumatic) are usually the most practical tool for use in airframe structural work.

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2
Q

What is the distinction between a drill and a drill bit?

A

The ‘Drill’ is the tool that applies power to rotate the ‘Drill Bit’, which does the actual cutting of the material.

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3
Q

What are the most common types of pneumatic drills?

A

The most common pneumatic drills are: Pistol Grip Drill, Straight Drill, Right-angle Drill, and 45° Angle Drill.

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4
Q

What is the most common type of electric drill used in workshops?

A

The most common type of electric drill is the ‘Drill Press’, also known as the Pedestal Drill, Pillar Drill, or Bench Drill.

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5
Q

Why must drill bits be carefully managed by aircraft engineers?

A

Drill bits can cause FOD (Foreign Object Damage) and must be retrieved and accounted for at the end of any shift.

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6
Q

What are the main types of drill bits classified for cutting metal?

A

The main types of drill bits are: Twist Drill, Countersink, Counter-bore, Flat Bottom Boring, and Speciality.

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7
Q

What is the shank of a drill?

A

The shank is the part designed to fit into the drilling machine (chuck) and can be a plain cylinder or tapered.

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8
Q

What is the purpose of the flutes on a drill bit?

A

Flutes allow for the removal of chips (swarf) produced at the cutting edge and enable cutting fluid to reach the cutting lips.

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9
Q

What does the point of a drill consist of?

A

The point consists of the Cutting Edge (lips), the flank, the face, the Web, and the Chisel Edge.

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10
Q

What is the purpose of a countersink tool?

A

A countersink tool is used to create a conical hole for a screw head to sit flush with the surface.

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11
Q

What is the function of a microstop countersink tool?

A

The microstop countersink tool controls the countersink depth and keeps the cutter perpendicular to the work surface.

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12
Q

What is spot facing?

A

Spot facing is the method used for cutting a flat area or seat for a bolt head or nut on a contoured surface.

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13
Q

What is the purpose of a reamer?

A

A reamer is used to finish a drilled hole to the exact size, producing a smooth finish when precision is required.

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14
Q

When is a reamer used?

A

A reamer is used when absolute precision is required for finishing a hole to the exact size.

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15
Q

What is the first step in using a reamer?

A

A hole is first drilled with a normal twist drill, slightly smaller than the finished hole.

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16
Q

What are the two main types of reamers?

A

Hand reamers and machine (chucking) reamers.

17
Q

What materials are reamers typically made from?

A

Reamers are made of either carbon tool steel or high-speed steel (HSS).

18
Q

How do the cutting blades of HSS reamers compare to carbon steel reamers?

A

The cutting blades of a high-speed steel reamer lose their sharpness quicker than those made of carbon steel.

19
Q

What is the purpose of the grooves on straight reamers?

A

The grooves provide a way for chips to escape and a channel for lubricant to reach the cutting edge.

20
Q

What should not be done when withdrawing a reamer?

A

Do not attempt to withdraw a reamer by turning it in the reverse direction, as chips can be forced into the surface.

21
Q

What is the function of hand reamers?

A

Hand reamers are used primarily ‘in-situ’ on the aircraft if the engineering instructions call for it.

22
Q

What is important to ensure when using a hand reamer?

A

It is important to keep the reamer perfectly straight during the cutting process.

23
Q

What is the difference between tapered reamers and bevel type hand reamers?

A

Tapered reamers produce tapered holes, while bevel type hand reamers require careful alignment with the hole.

24
Q

What is an adjustable hand reamer used for?

A

An adjustable hand reamer is used to smooth the bore walls of a drilled hole when precise sizing is necessary.

25
Q

How are adjustable reamers adjusted?

A

Adjustable reamers are adjusted by turning the adjusting nuts to set the blades to the desired size.

26
Q

What is the shank type of machine reamers?

A

Machine reamers have a morse tapered shank and NOT a square drive.

27
Q

What is the purpose of a straight shank reamer?

A

Straight shank reamers are used in a drill with a chuck fitted with a 3 jaw grip.

28
Q

What are the safety precautions when drilling?

A

Safety glasses must be worn, and the chuck key should be removed before starting the drill motor.

29
Q

What is the function of taps and dies?

A

A tap is used to cut threads on the inside of a hole, while a die is used for cutting external threads on a round bar.

30
Q

What are the three types of hand taps?

A

Taper tap, plug tap, and bottoming tap.

31
Q

What is the purpose of a tap wrench?

A

A tap wrench is used to hold and turn a tap when cutting internal threads by hand.

32
Q

What are the two general types of dies?

A

Solid dies and adjustable dies.

33
Q

What is the stock in threading dies?

A

The stock is the tool used to hold and turn a threading die when producing external threads by hand.