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Design Handbook

7. Piercing - Adjacent To Bends

Illustration "A" indicates that the minimum inside distance required from the edge of a hole to a bend is 1-1/2 times the material thickness (T) plus the bend radius (R)

Otherwise, distortion will occur as indicated in Illustration "B" - or piercing after form must be considered.

Illustration "C" indicates a similar condition to "A", except for openings with an edge parallel to bend. In this case the following requirements apply for economical tooling and production:

• When "L" = up to 1" - 2T + R (minimum).
• When "L" = 1" to 2" - 2-1/2T + R (minimum).
• When "L" = 2" or more - 3T to 3-1/2T + R (minimum).

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Dayton Rogers Manufacturing Co. acknowledges, with gratitude, selected illustrations and editorial material supplied by Precision Metalforming Association.