Total Ejector Box General Machining Hours Calculation

Total Ejector Box General Machining Hours = (Ejector Box Rails General Machining Hours + Ejector Plates General Machining Hours + Ejector Box Rails Drill Hours + Ejector Plates Drill Hours + Ejector Plate Pin Drill Hours + Support Pillars Drill Hours) * Ejector Box Machinability Index

  • Ejector Box Rails General Machining Hours: This is calculated as: ((Ejector Box Rails Surface Area / Ejector Box Rails Feed) + Ejector Box Rails Setup) * Number of Ejector Box Rails:

    • Ejector Box Rails Surface Area: See Ejector Box Rails Surface Area Calculation.

    • Ejector Box Rails Feed: aPriori performs a lookup in the cmToolMachiningRates table and returns the Rate corresponding to Ejector Box Rails General Machining.

    • Ejector Box Rails Setup: aPriori performs a lookup in the cmToolMachiningSetups table and returns the value of (Number of Setups * Setup Time) corresponding to Ejector Box Rails General Machining.

    • Number of Ejector Box Rails: This is specified by the cmEjectorBoxRailsNumber cost model variable (2 in starting point Digital Factories).

  • Ejector Plates General Machining Hours: This is calculated as: ((Ejector Plates Surface Area / Ejector Plates Feed) + Ejector Plates Setup) * Number of Ejector Plates:

    • Ejector Plates Surface Area: See Ejector Plates Surface Area Calculation.

    • Ejector Plates Feed: aPriori performs a lookup in the cmToolMachiningRates table and returns the Rate corresponding to Ejector Box Plates General Machining.

    • Ejector Plates Setup: aPriori performs a lookup in the cmToolMachiningSetups table and returns the value of (Number of Setups * Setup Time) corresponding to Ejector Box Plates General Machining.

    • Number of Ejector Plates: This is 2 by default.

  • Ejector Box Rails Drill Hours: This is calculated as: (Number of Ejector Box Rails Holes * Hole Drilling Time(Ejector Box Rails Height) + Ejector Box Rails Drill Setup) * Number of Ejector Box Rails:

    • Number of Ejector Box Rails Holes: This is calculated as whichever is the greatest of: Ejector Box Rail Holes Min, or (Mold Base Length / Ejector Box Rail Hole Spacing):

      • Ejector Box Rail Holes Min: This is the minimum number of holes in ejector box rails and is specified by the cmEjectorBoxRailHolesMin cost model variable (4 in starting point Digital Factories).

      • Mold Base Length: This is specified by the Mold Base Size – Length setup option.

      • Ejector Box Rail Hole Spacing: This is the linear spacing of holes in ejector box rails and is specified by the cmEjectorBoxRailHoleSpacing cost model variable (203.2 mm in starting point Digital Factories).

    • Hole Drilling Time(Ejector Box Rails Height): This is calculated as: (Ejector Box Rails Height / Standard Hole Drilling Rate):

      • Ejector Box Rails Height: This is specified by the cmEjectorBoxRailsHeight cost model variable (152.4 mm in starting point Digital Factories).

      • Standard Hole Drilling Rate: aPriori performs a lookup in the cmToolMachiningRates table and returns the Rate corresponding to Standard Hole Drilling.

    • Ejector Box Rails Drill Setup: aPriori performs a lookup in the cmToolMachiningSetups table and returns the value of (Number of Setups * Setup Time) corresponding to Ejector Box Rails Drilling.

    • Number of Ejector Box Rails: This is specified by the cmEjectorBoxRailsNumber cost model variable (2 in starting point Digital Factories).

  • Ejector Plates Drill Hours: This is calculated as: ((Number of Ejector Plates Holes * Hole Drilling Time(Ejector Plate Height):) + Ejector Plates Drill Setup) * Number of Ejector Plates:

    • Number of Ejector Plates Holes: See Number of Ejector Plates Holes Calculation.

    • Hole Drilling Time(Ejector Plate Height): This is calculated as: (Ejector Plate Height / Standard Hole Drilling Rate):

      • Ejector Plate Height: This is specified by the cmEjectorPlateThickness cost model variable (25.4 mm in starting point Digital Factories).

      • Standard Hole Drilling Rate: As described above.

    • Ejector Plates Drill Setup: aPriori performs a lookup in the cmToolMachiningSetups table and returns the value of (Number of Setups * Setup Time) corresponding to Ejector Box Plates Drilling.

    • Number of Ejector Plates: This is 2 by default.

  • Ejector Plate Pin Drill Hours: This is calculated as: (Number of Ejector Pins * Hole Drilling Time(Ejector Plate Height)):

    • Number of Ejector Pins: This is calculated as: (Projected Area / Default Ejector Pin Spacing):

      • Projected Area: This is the Parting Line Projected Area property, visible in the Geometric Cost Drivers panel.

      • Default Ejector Pin Spacing: This is specified by the cmEjectorPinSpacing cost model variable (7903.21 mm2 in starting point Digital Factories).

    • Hole Drilling Time(Ejector Plate Height): As described above.

  • Support Pillars Drill Hours: This is calculated as: Number of Support Pillars * (Support Pillar Drill Time Hours + Support Pillars Setup):

    • Number of Support Pillars: This is calculated as (Ejector Plate Area * Support Pillar Coverage / (PI * (Support Pillars Radius)2)):

      • Ejector Plate Area: This is calculated as: Mold Base Size – Length setup option * (Mold Base Size – Width setup option - cmEjectorPlatesWidthReduction cost model variable; 152.4 mm in starting point Digital Factories).

      • Support Pillar Coverage: This is calculated as the cmSupportPillarCoveragePercentage cost model variable (10 in starting point Digital Factories) / 100.

      • Support Pillars Radius: This is calculated as: Support Pillars Diameter / 2. ‘Support Pillars Diameter’ is specified by the cmEjectorPlateSupportPillarDiameter cost model variable (76.2 mm in starting point Digital Factories).

    • Support Pillar Drill Time Hours: This is calculated as: (Ejector Box Rails Height / Standard Hole Drilling Rate):

      • Ejector Box Rails Height: This is the default ejector box rails height and is specified by the cmEjectorBoxRailsHeight cost model variable (152.4 mm in starting point Digital Factories).

      • Standard Hole Drilling Rate: As described above.

    • Support Pillars Setup: aPriori performs a lookup in the cmToolMachiningSetups table and returns the value of (Number of Setups * Setup Time) corresponding to Support Pillars.

  • Ejector Box Machinability Index: This is the Machinability Index of the material specified by the Select Mold Material – Ejector Box setup option. This property is visible in the Digital Factory tool shop under Plastic Molding > Processes > Compression Molding > Tool Shops > Default.