18 Questions
What is the purpose of the bend allowance for a 90° bend formula?
To compute the allowance needed for bending metal at a 90° angle
How can the bend allowance for a 90° bend be determined using a chart?
By using the top number in each cell
Which parameter is required to calculate the bend allowance for a 90° bend?
Material thickness and bend radius
What does the lower number in each cell of the bend allowance chart represent?
The bend allowance for a 1° bend
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
What is the advantage of using online bend allowance calculation programs?
They eliminate the need for manual calculations
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
What metal alloy is used to create the L-bracket in Figure 4-129?
Aluminum alloy 2024-T3
What factors should be considered when forming straight line bends?
Thickness of the material, alloy composition, and temper condition
What does the radius of bend of a sheet of material refer to?
The radius as measured on the inside of the curved material
Why is it important to consider the minimum bend radius of a sheet of material?
To prevent weakening of the metal at the bend
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
What is the approximate bend radius for annealed sheet material?
Equal to its thickness
What kind of bend radius is required for stainless steel and 2024-T3 aluminum alloy?
Large bend radius
Why are setback and bend allowance important when forming straight angle bends?
To minimize forming effort
What must be considered to avoid weakening the metal at a bend?
Minimum radius of bend
What are other factors that must be considered when making straight line bends, besides bend allowance and setback?
Brake or sight line
Why does thinner material allow for sharper bends?
Greater flexibility in thinner materials
Test your knowledge on the removal and installation procedures of lockbolts, including differentiating between tension and shear pins. Learn about the steps involved in removing the collar and understanding the locking grooves of different pins.
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