Shakeout Formulas

The sand casting subprocess Shakeout relies on the formulas below.

Cycle Time = Process Time * Cycle Time Adjustment Factor

Cycle time is the product of the following:

• Process time (see formula below)

• Cycle time adjustment factor: specified by the cost model variable cycleTimeAdjustmentFactor; 1 in aPriori starting point VPEs.

Process Time = (Shakeout Time * Design Complexity Factor) / Number of Parts

Process time is the product of the following:

• Shakeout time: this is interpolated based on values looked up by rough mass (see Material Cost and Utilization for Sand Casting) plus core mass in one of the following lookup tables:

o tblShakeoutTime, if the machine Shakeout Type is conveyor or table.

o tblManualShakeoutTime, if the machine Shakeout Type is manual.

If the rough mass plus core mass falls outside the range covered by the lookup table, shakeout time is the minimum or maximum time that appears in the table. Note that the looked up value is converted from minutes to seconds for use in this formula.

• Design complexity factor: see Design Complexity Factor.

• Number of parts: this is 1 for machines whose Shakeout Type is manual or conveyor. For machines whose Shakeout Type is table, this is specified by the setup option Number of Parts on Shakeout Table; by default, it is the maximum number of parts that can fit on the machine--see Shakeout Machine Selection.