Design and Engineering Handbook
Part Design
Tool Design
Failure Analysis
Secondary Operations
Printable Brochure
Part Design: Typical Tunnel Gate Design

Notes:

TUNNEL GATING
Round Gates vs. Rectangular Gates

Round Gates

  • Easy to machine
  • Downward angle forms an oval on vertical plane more difficult to shear off
  • Changing diameter affects flow and freeze-off

Rectangular Gates

  • Must be burned in
  • Improved flow control for tight tolerances
    – Widen gate to increase flow
    – Modify thickness to control freeze-off time