Parting + draft.
Combined design.
Mold release.
Parting line and draft combined design. Both critical for mold release. Plan together for cost-effective production.
Key principles.
Edge / hidden
On edge or hidden surface. Avoid cosmetic faces.
Toward parting line
Draft tapers away from parting line for ejection.
1-2° standard
1° smooth surfaces. 2-5° textured.
Engineer review
Tooling engineer reviews part for parting+draft optimization.
Avoid undercut
Undercut features need side actions (premium tooling).
Avoids parting
Sometimes two-piece molded + assembled cheaper than complex tooling.
FAQ
Parting line + draft direction relationship?
All vertical surfaces draft away from parting line. Visualize ejection direction.
Multiple draft directions?
Side actions enable. But adds 30-100% to mold cost. Evaluate cost vs benefit.
Texture effect on draft?
Textured surfaces need more draft (3-5°) than smooth (1-2°). Per texture depth.
Discussion with tooling engineer?
Yes — early in design. Identify difficult features. Suggest design changes.
Mold flow + parting line?
Mold flow analysis predicts fill patterns. Helps optimize parting line position.
Two-piece alternative?
For complex undercut features, sometimes cheaper to mold two pieces and assemble.
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