How to Design Metal
Things We've Learned From Years Making Metal Stampings
2. Blank Design
a. Minimum Practical Section should never be less than material thickness or .060". A minimum section must be one and one half times material thickness for high shear strength material for the most practical stamping.
b. Radii on Blank Corners - Corners can be sharp if material thickness is 1/16" or less - over 1/16" allow corner radii (R) equal to 1/2 material thickness. See illustration.
c. Practical Design For Economy Manufacture.
W = .060 minimum for materials thinner than .060" wider if possible.
W1 = Never less than material thickness, wider if possible.
L = 5 x W is maximum depth, should be less if possible.
L1 = 5 x W is maximum length, should be less if possible.
The above rules (a and b) apply for maximum economy. If followed, all blank periphery can be included in the blanking die, eliminating secondary tooling and operations.
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