PRECISION FOUNDRY & INVESTMENT CASTING
Investment Casting Sprue, Runner & Ingate Calculator
Compute gating choke area ($A_c$), sprue exit velocity ($v = \sqrt{2gH}$), gating ratios ($A_s:A_r:A_g$), pouring time, and alloy solidification shrinkage compensation.
1. Casting & Hydraulic Inputs
Vertical height from pouring cup lip to choke plane.
2. Gating Hydraulic Dimensions
Sprue Exit Velocity
0.00 m/s
Choke Area (A_c)
0.0 mm²
Runner Total Area
0.0 mm²
Ingate Total Area
0.0 mm²
3. Gating Tree Hydraulics Visualizer
Investment Tooling & Vector Prepress Notes
1. Torricelli Velocity Principle: Molten metal velocity at the sprue exit is governed by $v = \sqrt{2gH_{\text{eff}}}$. For bronze and aluminum, velocity entering the mold cavity should remain under $0.5 - 0.8\,\text{m/s}$ to prevent turbulent oxide skin entrapment.
2. Gating Ratios: In an unpressurized gating system ($1:2:2$), the choke occurs at the bottom of the sprue, causing the runner and ingates to fill completely before metal enters the part cavity, providing passive slag and dross flotation.