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Draft Requirements

Draft is necessary on surfaces parallel to the direction of the die draw because it facilitates the ejection of the part from the tool.

  • It is not common practice to compute the draft angle for each feature on a component, and it is normally generalizedwith some exceptions
  • Twice as much draft angle is recommended for inside walls or surfaces as for outside walls or surfaces
  • This is because the alloy solidifies and shrinks onto the features that form the inside surface and away from the features that form the outside surfaces.
MULTI-SLIDE ZINC DIE CASTING
Cores 0 Degree ≤ 6.35
0.15 Degree > 6.35
0 Degree ≤ .250”
0.25 Degree > .250”
Cavity 0-0.15 Degree 0-0.25 Degree
CONVENTIONAL ZINC DIE CASTING
Cores 1/2 Degree 1/2 Degree
Cavity 1/8 – 1/4 Degree 1/8 – 1/4 Degree
PRECISION ALUMINUM DIE CASTING
Cores 2 Degrees 2 Degrees
Cavity 1/2 Degree 1/2 Degree
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Last updated 04.24.2020