Lockbolt Removal and Installation Quiz

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What is the purpose of the bend allowance for a 90° bend formula?

To determine the radius of a bend

To calculate the material thickness of a U-channel

To find the weight of a material

To compute the allowance needed for bending metal at a 90° angle (correct)

How can the bend allowance for a 90° bend be determined using a chart?

By using the top number in each cell (correct)

By adding both numbers in the cell

By using the lower number in each cell

By looking at the left-hand column only

Which parameter is required to calculate the bend allowance for a 90° bend?

Material type and bend radius

Material thickness and bend radius (correct)

Material type and degree of bend

Material thickness and degree of bend

What does the lower number in each cell of the bend allowance chart represent?

The bend allowance for a 1° bend Signup and view all the answers

How is the correct bend allowance found in the chart for a U-channel with a material thickness of 0.040 inch and a bend radius of 0.16 inch?

By finding the block opposite the material thickness and radius values Signup and view all the answers

What is the advantage of using online bend allowance calculation programs?

They eliminate the need for manual calculations Signup and view all the answers

When bending metal at angles other than 90°, what should be used to compute the bend allowance?

The lower number in each block on the chart Signup and view all the answers

What metal alloy is used to create the L-bracket in Figure 4-129?

Aluminum alloy 2024-T3 Signup and view all the answers

What factors should be considered when forming straight line bends?

Thickness of the material, alloy composition, and temper condition Signup and view all the answers

What does the radius of bend of a sheet of material refer to?

The radius as measured on the inside of the curved material Signup and view all the answers

Why is it important to consider the minimum bend radius of a sheet of material?

To prevent weakening of the metal at the bend Signup and view all the answers

What is the effect of a radius of bend that is too small on a sheet of material?

Weakening of the metal and potential cracking Signup and view all the answers

What is the approximate bend radius for annealed sheet material?

Equal to its thickness Signup and view all the answers

What kind of bend radius is required for stainless steel and 2024-T3 aluminum alloy?

Large bend radius Signup and view all the answers

Why are setback and bend allowance important when forming straight angle bends?

To minimize forming effort Signup and view all the answers

What must be considered to avoid weakening the metal at a bend?

Minimum radius of bend Signup and view all the answers

What are other factors that must be considered when making straight line bends, besides bend allowance and setback?

Brake or sight line Signup and view all the answers

Why does thinner material allow for sharper bends?

Greater flexibility in thinner materials Signup and view all the answers