Day 4 Progress Check

Which is a recommended method for marking layout lines on sheet metal?

Grease pencils

For a bend angle other than 90°, how is the setback calculated?

Setback = K(Bend Radius + Material Thickness)

If the bend radius is 3/32 inches, the material thickness is 0.040 inches, the F1 length is 1 inch, the F2 length is 2 inches, and the F3 length is 1 inch, what is the total developed width (TDW) for a 90° U-channel bend?

3.816 inches

If the bend radius is 5/32 inches, the material thickness is 0.040 inches, and the bend angle is 45°, what is the bend allowance?

0.136 inches

What is the purpose of the K-value in calculating the setback for bends other than 90°?

It is a constant that accounts for the bend angle

What is the bend allowance?

The distance between the two tangent lines on a flat layout

What is the purpose of the sight line when bending sheet metal?

To ensure the bend occurs between the bend tangent lines

The neutral axis of a bent sheet metal part is defined as:

The area that does not stretch or shrink during bending

In a U-channel flat layout, how many setbacks are present on the F2 flat?

2

How is the bend allowance calculated for a bend angle other than 90°?

BA is obtained from a bend allowance chart

If the bend radius is 5/32 inches, the material thickness is 0.040 inches, and the bend angle is 45°, what is the setback?

0.081 inches

Which factor affects the minimum bend radius?

Temper of the metal

Which of the following statements about the grain direction of sheet metal is true?

The bend lines should lie at a 90° angle to the grain if possible

If the bend radius is 5/32 inches and the material thickness is 0.040 inches, what is the setback for a 90° bend?

0.196 inches