7.8: Riveting

Question 1

What are three types of rivet joints?

Answer 1

Lap joints
Flush joints
Joggle joints

Question 2

What are the factors that govern strength in a joint?

Answer 2

Material specification
Rivet specification
Rivet spacing

Question 3

What are lap joints?

Answer 3

When the skin is riveted together so there is a distinct change in levels

Question 4

What are joggle joints?

Answer 4

A combination of flush and lap, with one skin joggled to accomodate the other producing one smooth side

Question 5

Where are lap joints usually used and why?

Answer 5

On light aircraft where aerodynamics aren’t as critical

Question 6

What are joggle joints used for?

Answer 6

As doublers over internal structures, by allowing the pieces of metal to be on the same plane

Question 7

What is the pitch of the fastener?

Answer 7

• The distance from the centre of one fastener hole to the centre of the next fastener hole in the same row
• Quoted in terms of fastener nominal shank diameter D
• horizontal

Question 8

What is edge margin/land?

Answer 8

The distance from the centre of the fastener hole to the nearest edge of a sheet

Question 9

What is the general rule of thumb for edge margin in terms of D?

Answer 9

2 to 2.5D

Question 10

What is spacing? What is its usual dimension?

Answer 10

• The difference between fastener centre holes between two different rows
• generally 4 to 5D
• vertical

Question 11

What are spheres of influence? What size is it usually?

Answer 11

The area of sheet metal that a rivet achieves a watertight joint, usually 5D

Question 12

What pressure do pneumatic guns operate at?

Answer 12

92 to 99 psi

Question 13

How much blows per minute do slow hitting rivet guns do?

Answer 13

900 to 2500 bpm

Question 14

How quick does a rivet gun upset a rivet?

Answer 14

one to three seconds

Question 15

How should the force of the rivet gun be absorbed?

Answer 15

By the bucking bar

Question 16

What are larger rivet heads used for?

Answer 16

Thinner skins

Question 17

When can compression riveting be used?

Answer 17

Where the reach of the riveting tongs is long enough

Question 18

What are the two types of compression riveting?

Answer 18

Hand held riveting
Pneumatic riveting

Question 19

What are the common skin pins?

Answer 19

Cleco fasteners
Gripper pins

Question 20

How much force does cleco wing nut fasteners use for clamping?

Answer 20

135 kg of clamping force, making them useful for higher clamp up pressure

Question 21

Do gripper pins need tools?

Answer 21

No unlike cleco

Question 22

How is the depth of a cut adjusted on rivet shavers?

Answer 22

By pulling outwards on the stop and turning it in either direction

Question 23

What are countersink tool angles?

Answer 23

82 degrees
100 degrees (most commonly used)
120 degrees

Question 24

What’s the most common problem encountered when hand countersinking?

Answer 24

chattering

Question 25

What size should the pilot in microstop countersinking be?

Answer 25

Should be 0.002m in smaller than the hole size

Question 26

When is dimpling is materials used?

Answer 26

When they are too thin to countersink directly

Question 27

Where can you find rivet spacing, edge margin and pitch minimums?

Answer 27

Structure repair manual