Casting Gating System Calculator
SI
Imp
Imperial
Inputs
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Casting mass
(m_c)
Net casting mass before gates, runners, risers and pouring losses.
kg
Casting yield
(Y)
Casting yield = net casting mass / total poured metal mass.
%
Molten metal density
(rho)
User-entered molten metal density. Aluminum is roughly 2700 kg/m3 as a first-pass solid-density basis.
kg/m³
Pour time
(t)
Target fill time used to convert total poured volume into volumetric flow rate.
s
Effective metal head
(h)
Effective head above the choke used in the orifice relation.
mm
Discharge coefficient
(Cd)
Flow coefficient applied to ideal velocity sqrt(2*g*h).
Sprue ratio part
(R_s)
First number in the total sprue:runner:ingate area ratio. Choke area is scaled from this base.
Runner ratio part
(R_r)
Second number in the total sprue:runner:ingate area ratio.
Ingate ratio part
(R_i)
Third number in the total sprue:runner:ingate area ratio. The calculator divides this total among the entered ingates.
Number of ingates
(n_i)
Count of individual ingates sharing the total ingate area.
Target max ingate velocity
(v_i,max)
Screening target used only for the ingate velocity utilization verdict.
m/s
Results
Default result
Edit inputs
Choke area
(A_choke)
186.95
mm²
Also computed
Total poured metal
(m_p)
18.18
kg
Mass pour rate
(m_dot)
0.6061
kg/s
Volume pour rate
(Q)
13.47
L/min
Total runner area
(A_runner)
373.91
mm²
Total ingate area
(A_ingates)
747.81
mm²
Area per ingate
(A_i)
186.95
mm²
Ingate velocity
(v_i)
Pass
0.3002
m/s
Velocity utilization
(v_i/v_max)
60.03
%
Gates/risers/remelt mass
(m_g)
8.18
kg
Total poured volume
(V_p)
6,734
cm³
Head velocity
(Cd*sqrt(2gh))
1.201
m/s
Entered yield
(Y)
Pass
55
%
Show 6 more results
Method notes
4 notes
Total poured metal is computed from entered yield: m_poured = m_casting / (Y/100).
Choke area uses A_choke = Q / (Cd*sqrt(2*g*h)), where Q is total poured volume divided by pour time.
Runner and ingate totals follow the entered sprue:runner:ingate area ratio; area per ingate divides total ingate area by the entered ingate count.
This is a formula-only foundry screen. It does not model turbulence, oxide entrainment, aspiration, choke placement, sprue taper, freezing during fill, shrinkage feeding, riser necks, alloy/mold behavior, simulation or production approval.
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