Process & QC — Draft Angle & Ejection
Draft Angle & Ejection for injection molding process control.
Draft is the tax every vertical wall pays for leaving the mold — and texture multiplies it: a leather-grain finish needs 3°+ or it drags white scuff marks down every part. The draft argument between design and tooling is settled by this arithmetic, not by taste.
Formula
Note: Starting-point process values — the resin grade's datasheet and an in-mold study govern. Verify with a gate-seal study and a cooling-time ladder on the actual tool.
Draft Angle & Ejection for injection molding process control. A free injection molding cycle & process tool — no sign-up, no upload, instant results in your browser.
About Process & QC — Draft Angle & Ejection
Process & QC — Draft Angle & Ejection computes the governing relationship relief = depth×tanθ; rule: ≥0.5° polished + 1° per 25 µm texture live as you type. Draft is the tax every vertical wall pays for leaving the mold — and texture multiplies it: a leather-grain finish needs 3°+ or it drags white scuff marks down every part. The draft argument between design and tooling is settled by this arithmetic, not by taste. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Process & QC — Draft Angle & Ejection
- 1Enter your values — Feature depth, Draft angle, Texture depth (sensible defaults are pre-filled).
- 2Read the live results: Dimension change over depth, Recommended draft.
- 3Check the "with your numbers" line to see relief = depth×tanθ; rule: ≥0.5° polished + 1° per 25 µm texture substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Process & QC — Draft Angle & Ejection?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula relief = depth×tanθ; rule: ≥0.5° polished + 1° per 25 µm texture with authoritative sources cited on the page (Rosato, Injection Molding Handbook, 3rd ed.; Osswald & Hernández-Ortiz, Polymer Processing — Modeling and Simulation)
- ✓Draft is the tax every vertical wall pays for leaving the mold — and texture multiplies it: a leather-grain finish needs 3°+ or it drags white scuff marks down every part.
- ✓Niche-specific defaults give a meaningful worked answer the moment the page loads
Frequently asked questions
What formula does the process & qc — draft angle & ejection use?+
It evaluates relief = depth×tanθ; rule: ≥0.5° polished + 1° per 25 µm texture, exactly as published. Sources: Rosato, Injection Molding Handbook, 3rd ed.; Osswald & Hernández-Ortiz, Polymer Processing — Modeling and Simulation. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
Draft is the tax every vertical wall pays for leaving the mold — and texture multiplies it: a leather-grain finish needs 3°+ or it drags white scuff marks down every part. Starting-point process values — the resin grade's datasheet and an in-mold study govern. Verify with a gate-seal study and a cooling-time ladder on the actual tool.
When is this calculator the right tool for the job?+
Draft Angle & Ejection for injection molding process control. A free injection molding cycle & process tool. The draft argument between design and tooling is settled by this arithmetic, not by taste. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Do I need to install anything or create an account?+
No. The tool is pure client-side JavaScript: open the page and it works, offline once loaded, with no account, no quota and no data leaving your device.
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