Required Shot Size

Required shot size affects machine selection (see Machine Feasibility and Selection). It is calculated with the following formula:

Required Shot Size = Shot Size Safety Factor *

((Part Volume * Number of Mold Cavities) + Runner Volume) * Material Density * Specific Gravity

Required shot size depends on the following:

• Shot size safety factor (specified by the plant variable shotSizeSafetyFactor)

• Part volume (obtained from GCD extraction)

• Number of cavities (see Number and Layout of Mold Cavities)

• Runner volume (see Runner System Model)

• Material density (specified by a material property)

• Specific gravity: this is the ratio of polystyrene density (specified by the cost model variable densityPolystyreneForShotSize) to the density of the current material (specified by the material property Density).