Mock Test Flashcards
Why is a pilot drill used prior to drilling large holes?
To provide clearance for the chisel tip.
Oil and water emulsion is the recommended cutting fluid for which material?
Steel
What are the two types of drill shanks?
- Tapered shank
- Parallel shank
What are the two types of flutes found on reamers?
- Straight
- Spiral
Why are pencils and crayons not used for marking out on areas that are subject to high temperatures?
They can leave carbon deposits, leading to carbonisation and embrittlement.
When must an instantair swivel coupling be lubricated?
Following immersion in a solvent/degreasing liquid using machine oil
What is the fatal air pressure?
4 PSI
What two materials are Pop Rivets made from?
- Aluminium Alloy
- Monel Metal
What two types of mandrel are there on Pop Rivets?
- Break Head
- Break Stem
Which two tools are used to fit Pop Rivets?
- PS15 Pop Pliers
- TT4D Lazy Tongs
What are the 3 common Rivet patterns?
- Single Row
- Double Row
- Staggered Row
What is the minimum pitch allowed between rivets?
4D
When riveting, what does ‘Land’ refer to?
The distance between the edge of the material and the centre of the rivet.
What is the accuracy of a Metric Micrometer?
0.01mm
What is the accuracy of an Imperial Micrometer?
0.001”
What is the accuracy of a Vernier Caliper in both Metric and Imperial scales?
- 0.02mm
- 0.001”
What is the smallest measurement a Vernier Bevel Protractor can measure?
5 minutes
What does a Dial Test Indicator measure?
Variations between high and low areas on a component
How many minutes equal 1 degree on a Vernier Bevel Protractor?
60 minutes
What Vernier principle does Vernier Calipers work from?
49/50
What principle does the Vernier Bevel Protractor work on?
23/12
What is the accuracy of a DTI in Metric and Imperial?
- 0.01mm
- 0.001”
What does a Surface Texture Comparison Plate do?
They have a range of machines surfaces to measure the finish of your own piece again, using RA (Roughness Average)
In calibration, what is the yellow sticker used for?
‘Valid Calibration Label’
MOD Form 1775A
In calibration, what is the blue sticker used for?
‘Calibration not maintained’
MOD Form 1778
In calibration, what is the white sticker with orange borders used for?
‘Calibration not required’
MOD Form 1780
What are standard twist drills made from?
High speed steel
How are standard twist drills classified?
- Shank Type
- Length
- Material
- Diameter
What are the 3 main functions of flutes?
- Present the cutting edge of the drill at the right angle.
- Allows sworf to be removed
- Allows cool air and coolant in to the hole
What is land in reference to a drill?
The narrow strip that runs along the length of each flute
What is a Combination Centre Drill used for?
Cuts a small 60 degree countersink into a workpiece to aid in the start of drilling
What are cobalt drills used for?
They are used when drilling hard materials, however they are very brittle.
Where would you find the size of a drill?
The diameter is usually etched or stamped on the shank or neck of the drill
When are hand drills used?
Where power drills are not available and/or limited accuracy is required.
What is countersinking?
A drilling process to create an angled recess specific to the head of a screw or rivet.
What are reamers used for?
They are used to enlarge drilled holes to accurate dimensions.
On reamers, what direction do they twist and why?
Anti-clockwise, to prevent the reamer from being pulled into the hole by machine rotation
What is a popular method for producing a round hole in a piece of sheet metal?
A Q-Max Cutter
From how far away can compressed air penetrate the skin?
From up to 38cm away.
What are the two types of permanent marking?
- Metal Stamping
- Machine Engraving
What can metal stamping do to the material?
Cause a reduction of fatigue resistance and cause premature failure or breakage
When can stamping not be used?
- On Aluminium Alloy thinner than 20SWG
- On high stress areas of steel
- Where doubt exists, due to the size or stress of the piece
What shape should the stamp produce and why?
Stamps should produce a ‘U’ shape rather than a ‘V’ shape to put less stress on the material
What is the tip of engraving tools made from?
- Solid Carbide
- Carbide Tipped Steel
What are solid rivets?
Rivets that are used when there is access to both sides of a material and have a preformed head
What are Blind Rivets?
Rivets that are used when you only have access to one side of a piece.
What are rivets used for?
Joining sheet metal together
What are the types of head on a river?
- Domed
- Countersunk
How are POP Rivets identified?
Using the manufactures reference or by the Aircraft General Standards (AGS) code.
In POP Rivet identification, what does the code:
TLP/D/BS420
mean?
T = Tucker L = Monel Metal P = POP Rivet D = Domed Head BS = Break Stem 4 = Diameter 20 = Length
What two basic types of riveted joints are there?
- Lap joints
- Butt joints
What does the pitch refer to when riveting?
The distance between the centre of rivets.
What is the land for sheet metal above and below 18SWG?
- 18SWG+ = 2D
- Below 18SWG = 2.5D
How can you remove a faulty pop rivet?
Using a small drill to remove the centre of a rivet