M6 Day 2

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  • Created by: astonjmky
  • Created on: 16-03-22 16:16
What direction does the thread go on a left hand screw?
Anti clockwise
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A clockwise thread direction means it is a what hand screw
Right hand
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What is the lead on a screw
The distance moved in 1 turn
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The female thread is
An internal thread
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An external thread is
male
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A 4 start has a lead what times the pitch?
4 X the pitch. A 2 start has a lead 2 x the pitch.
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What is the pitch?
The angle from crest to crest
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What are the british standard thread forms
British Standard Whitworth (BSW)
British Standard Fine (BSF)
British Standard Pipe (BSP)
British Assosciation (BA)
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What are the american thread forms
ANC & ANF
(American national Coarse & American national Fine)
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Unified Thread Forms
UNC, UNF, UNEF
(United national coarse
United National Fine
United National Extra fine)
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What is British Association diameter below?
1/4" Diameter
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What is the thread angle of BSW & BSF
55 degrees
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What is the thread angle of BA
47.5 degrees
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What is the thread angle of ANC & ANF
60 degrees
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What is the thread angle of all unified threads?
60 degrees
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How can you identify unified screws?
They have markings to identify
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What are the markings on a unified screw?
3 circles
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How can you determine the pitch of a thread?
With screw pitch guages
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What are the three specialist threads?
Square, Buttress, Acme
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Which specialist thread can only transmit load in 1 direction?
Buttress
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How is a bolt tightened?
with a nut
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What should be done when installing a bolt?
Install so if loose, they remain in head upwards, in direction of rotation.
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How is a nut installed so that it is in safety?
Install the nut so that less than 1/32" of thread is showing.

So that if bolt/nut starts to undo it is still engaged with thread.
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What should be done if the bolt is chamfered?
The whole chamfer must extend through the nut
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What should all fasteners have done to them?
Torqued to the correct value according to SRM
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How are bolts identified?
With a marking on the head
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How are steel bolts identified?
With an 'X' On the head
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How are Steel, close tolerance bolts marked?
With a triangle with an 'X' inside it on the head of the bolt
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How are CRS bolts marked?
With a '-' on the head
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How are CRS, Close tolerance bolts marked?
With a single '-' and a triangle on the head
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How are Aluminium bolts identified?
With 2 '-' on the head
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How are Aluminium alloy, close tolerance bolts identified?
With a '-' followed by a triangle, followed by another '-' on the head of the bolkt.
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On a bolt, the length extends from where to where?
The bottom of the head to the shank
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Where are all bolts and screws identified?
in the IPC - Illustrated parts catalogue
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What is the grip length?
The material thickness
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When the total material thickness is less than 2.4mm, what is allowed in regards to threads?
When less than 2.4mm, No pitch threads are allowed in the material
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When over 2.4mm material thickness, how many pitch threads are allowed in the material?
2 pitch threads.
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What is the maximum amount of washers that can be used?
3
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What are the 4 types of studs?
Standard, Waisted, Stepped, Shouldered
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What is a stud?
A piece of rod with thread at each end. Has no head.
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What is the most common stud?
Standard Stud
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What are the 3 methods of fitting studs?
Stud box, Stud insertion tool, and Lock nuts - (two spanners)
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How do you remove a broken stud?
Using an ezi out extractor
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What does a self tapping screw do?
Cuts its own thread
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What are the 3 types of castle nut?
Shear castle nut, castle nut, slotted engine nut
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Where is a slotted engine nut used?
In the engine
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Characteristic of a wing nut?
Two protruding 'wings' - finger tightened, low torque applications.
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What do most locking nuts use to lock themselves?
Friction
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Characteristics of a Nyloc Stiffnut?
Nylon insert on end. Nylon is compressed when tightened, creating a friction lock.
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What temperature can Nyloc stiffnuts not exceed?
121C
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How does an Oddie stiff nut work?
It has 6 tongues, that, once inserted, push out, preventing it from being extracted.
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What do Aerotight and Philidas stiffnuts rely on to self-lock?
Friction
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When is an anchor nut used?
When some play (movement) is required to allow bolt to locate hole.
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When would a ***** anchor nut be used?
When a panel with lots of fasteners is used.
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What is the minimum temperature requirement for high temperature self locking nuts?
120C
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What must high temp self locking nuts be made from?
All metal, such as CRES, Steel.
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What is the maximum temperature for a low temperature self locking nut?
121C
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How would you know if a Nyloc Stiffnut is not to be reused?
If they can be run up finger tight.
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What is a helicoil?
A repair that can be used for expensive, damaged thread, or to protect soft material. It is available for all thread types, and has a driving tang.
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What does a helicoil assure?
Assures full load distribution.
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What are the two types of helicoil?
Standard and screw lock.
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What is the difference between Standard and Screw lock helicoils?
Standard has a free running thread, whereas screw lock has an internal locking thread.
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What do helicoils provide stronger than the original?
A stronger thread.
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What type of thread is helicoil used for?
Internal thread.
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What are Cotter (split) pins made from?
Low Carbon steel, CRES
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Where is a split pin measured to?
To the shortest prong
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Why would a CRES Split pin be used?
for non magnetic areas
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What is the kind of fit desired when installing a split pin?
A good fit - not loose.
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What are the preferred rules when installing split pins?
No overhang, Don't contact washers.
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What does a key do?
Transmits drive, locks shaft to head.
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What is a characteristic of Gib headed keys?
They are removeable.
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What is the taper ratio of a tapered key?
1:100 - for every 100mm along, the key tapers by 1mm
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What are keys made from?
A solid metal piece.
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What loosens fasteners?
Vibrations.
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What is safetying?
Securing Fasteners.
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What is safety wire (locking wire) measured in?
1000ths of an inch. (0.0001)
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What are some of the common methods for safetying?
Wire locking, split pinning, lock washers, lock plates, snap rings (circlips), Self locking nuts.
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How many times can a lock washer be reused?
None, they are a 1x use.
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What are the 2 methods of wirelocking?
Single & Double twist.
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What is the preferred method of wirelocking?
Double.
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Where would we use single twist wirelocking?
Small screws, electrical systems, hard to access areas.
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Where would we find the required twists per inch?
AMM Chapter 20
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What are 3 types of washers?
Spring washers, Tab washers, Shakeproof Washers.
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Characteristics of a spring washer?
Compressed, friction lock.
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Characteristics of a tab washer?
Tabs are bent - 1x use.
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When is a shakeproof washer reusable?
If it has retained it's springiness.
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What are the 2 types of Dzus fastener?
Light duty & Heavy duty.
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What are the characteristics of an 1100 aluminium rivet?
Soft, pure rivet. Low strength. No marking.
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What can be done to 2017, 2117, 7050 rivets?
They can be heat treated.
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What strength are 2017, 2117, and 7050 rivets?
Medium strength
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What is an advantage of Monel rivets?
Heat resistance
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What is an advantage of titanium rivets?
High heat resistance, High strength.
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What is a rivets minimum diameter, usually?
3x thickest sheet thickness.
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What is the standard countersink angle?
100 degrees
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If it is a thick piece of material, what can the countersink angle be?
82 degrees.
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If it is a thin piece of material what can the countersink angle be?
120 degrees.
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What is the marking on a 2017(D) rivet?
a raised dot
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What is the marking on a 2117(AD) rivet?
Small dimple
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What is the marking on a 2024 (DD) rivet?
Two raised dashes
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What is the marking on a 5056 (B) rivet?
A raised cross.
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What does a 5056 (B) rivet prevent?
Dissimilar metal corrosion
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What is the marking on a 7050 (E) rivet?
Corrugated head.
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What marking does a monel rivet (M) have?
2 dimples or a raised 'r'
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What are the 2 parts of a Hi-Lok?
Threaded pin with a head, and a collar.
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What are the characteristics of a Hi-lite?
Similar to a Hi-Lok, less material, which saves weight. It is 15% lighter.
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What is the maximum out of parallel angle for CRES collars?
0.5 degrees.
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What is the maximum out of parallel angle for Aluminium alloy collars?
3 degrees.
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What is the taper ratio for a Taper-Lok?
1:48
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What do Taper-Loks require?
Special lubricant, and approved operators.
109 of 110
Characteristics of a lock bolt?
Strong, light, two pieces: Pin, collar.
110 of 110

Other cards in this set

Card 2

Front

A clockwise thread direction means it is a what hand screw

Back

Right hand

Card 3

Front

What is the lead on a screw

Back

Preview of the front of card 3

Card 4

Front

The female thread is

Back

Preview of the front of card 4

Card 5

Front

An external thread is

Back

Preview of the front of card 5
View more cards

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