Metalic structure Flashcards

1
Q

Name at least three types of self plugging mechanical lock rivet?

A

CherryLOCK - CherryMAX -OlympicLOK HuckLOCK

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2
Q

What is the difference between the tool required to pull a CherryLock rivet and CherryMAX rivet?

A

CherryLOCK rivet require a tool for each different size and head shape, while one pulling tool will set any size CherryMax rivet

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3
Q

What of the five stresses is the most common cause of rivet failure?

A

Shear stress

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4
Q

If a 2024 rivet must be replaced with a 2117 rivet, how do you determine the size to be used?

A

For a 5/32 inch or smaller diameter use the next larger size of 2117 assuming that the edge distance and spacing meet the minimum requirement

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5
Q

Describe the process for determine the total length of a solid rivet for a particular installation?

A

Add the grip length (thickness of the material being joint) plus 1 1/2 times rivet diameter

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6
Q

what minimum edge distance and spacing should be used for a single row of protruding head rivet?

A

Not less than two diameters from the edge and not less than three rivet apart

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7
Q

How can a mechanic determine whether the countersink for a flush rivet should be dimpled or drilled?

A

By the thickness of the top sheet, thin sheet are dimpled while a thick sheet may be countersink

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8
Q

what action is taken to prevent cracks from forming while dimpling magnesium or some hard sheet metal?

A

Hot dimpling equipment is used to preheat and soften the metal before the dimple is formed

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9
Q

What type of damage can occur when using a rivet set that does not properly fit the rivet?

A

If the radius of the set is too small, it will damage the rivet.
If the set is oversize it will damage the sheet metal

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10
Q

Why is it important to use the proper size and weight bucking bar when performing sheet metal riveting?

A

If a buckling bar is too large or heavy, it will be hard to control and may cause damage to the surrounding areas.
If the buckling bar is light it will not properly upset the rivet before work hardening occur

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11
Q

What happen to stem of a self plugging rivet when the rivet is installed?

A

The stem is pulled until it snap off and the remaining projecting part is trimmed flush with the head

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12
Q

Describe the marking found on the head of A, B, D, AD, DD, and E rivets?

A

A= plain rivet
B= Rivet have a cross
D= Rivet has a raised dot
AD= Rivet have a dimple
DD= Rivet have a double dash
E = Rivet have a raised ring

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13
Q

What are the dimension of a properly rivet head?

A

The head should be 1 1/2 times the shank diameter in Width and 1/2 the shank diameter in height

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14
Q

Name several methods of forming sheet metal?

A

1- Bending 2- Stretching 3- Shrinking 4-Bumping 5- crimping

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15
Q

What is the major type of damage to aluminum structures that is caused by exposure to the whether?

A

Corrosion

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16
Q

What procedure should be followed to properly remove a solid shank rivet?

A

Center punch the rivet and than drill just to the base of the rivet head with the same size or one size smaller drill, once drill use a pinpunch to tip off the rivet head and drive the remaining shank out of the hole while supporting the surrounding metal

17
Q

When repairing on all metal aircraft, how do you determine what metal should be used?

A

Always use metal of the same type and thickness of the original structure

18
Q

Describe a joggle and explain its function?

A

a joggle is an offset formed at the intersection of two or more sheet of metal to allow multiple sheet to be stacked flat against each other

19
Q

What are the two reasons for installing a lightening hole in a sheet metal wing rib?

A

lightening hole reduce the weight and increase stifness

20
Q

What is done to a corner where two bends intersect to prevent cracking?

A

Relief hole is drilled in the corner

21
Q

what factor must be considered in order to determine set back?

A

Band radius and thickness of the metal

22
Q

what are the two special calculation that must be made when bending sheet metal?

A

Set back and band allowance