mettalic oral questiobns

What are three requirements for a repair to a piece of sheet metal aircraft structure?

The repair must restore the lost strength and rigidity, also must not change the aerodynamic shape of the structure.

When making a riveted repair to an aircraft sheet metal structure, which should be the stronger, the shear strength of the rivet, or the bearing strength of the metal sheet?

The rivet and the sheet should be strong enough that one does not damage the other, but the bearing strength of the sheet should be less than the shear strength of the rivet.

What type of device is a Cleco fastener?

A patented fastener that is inserted in the rivet holes and is used to hold two pieces of sheet metal together until they can be riveted.

What is the main function of throatless shears in an aircraft sheet metal shop?

Throatless shears are used to cut mild carbon steel up to 10-gage, and stainless steel up to 12-gage. They can be used to cut irregular curves in the metal.

What is the purpose of a sight line when laying out sheet metal to be bent in a cornice brake?

A sight line allows the jaws of a cornice brake to be positioned so the bend made by the brake will start at the bend tangent line.

What kind of metal forming is done by a slip roll former?

Simple curves with a large radius.

What kind of metal forming is done by bumping?

Compound curves in sheet metal.

What must be done to the flanges of an angle of it to be curved?

The flanges must be stretched for a convex curve and shrunk for a concave curve.

What is meant by the bend allowance used in making a bend in a piece of sheet metal?

The bend allowance is the amount of metal that is actually used in making the bend.

What determines the minimum bend radius that can be used with a piece of sheet metal?

The thickness of the material and its hardness.