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24 Cards in this Set

  • Front
  • Back

Most common forming method

Air bending

Points of contact when air bending

3 point

Final inside bend radius when air bending determined by


20% rule

Width of die opening x 20% equals bend radius. (2" die x .20 = .4" bend radius)

Outside setback of bend

Distance between tangent point of radius and apex if bend


Brake line

8x die rule applies to material up to


Die opening rule for material over 1/2"


When radius is less than 63% of material thickness, bend is considered


Any holes within outside setback will


Light gauge metal formed with

Leaf brakes, pan brakes, box brakes

Press capacity base on

Bending mild steel over 8x die

"K" in K factor represents

Neutral axis

Minimum bend radius determines

Limit of bending before material splitting occurs

Coining used on material thicknesses of

12 gauge or thinner

2 factors for tonnage requirements

Material type and thickness

Press has more tonnage for a lower cost

Hydraulic press

4 factors to determine capacity

Length of workpiece, thickness of Material, type and grade of Material, sharpness of bend

Bending type faster and more accurate

Bottom bending

Bending type better for light gauge production, not suitable for heavy material

Bottom bending

Die has 90° angle

Bottom bending die

Die has 85° angle

Air bending die

Bend allowance determined by

Type and grade of Material, thickness of Material, width of die opening, radius of upper die

A sweep to check bends

Bend set