Mask Bench Formulas
Cycle Time = Process Time * Adjustment Factor
Cycle time is the product of the following:
• Process time (see formula below)
• Adjustment factor (specified by the cost model variable cycleTimeAdjustmentFactor). This factor is 1 in aPriori starting point VPEs. VPE administrators can modify cycleTimeAdjustmentFactor in order to adjust cycle times across processes within the current VPE.
Process Time = Load Time + Sum of Operation Times + Unload Time
Process time depends on the following:
• Load time (see formula).
• Sum of operation times: this is the sum of the times spent on each masked feature. See the formula Masking Time for Surfaces and the formula Masking Time for Holes, below, for the per-feature masking time. The total masking time for the most recent costing is displayed in the Process Options Editor as Total Time to Mask Surface Area. The total surface area masked is displayed in the Process Options Editor as Total Masked Surface Area on the Part.
• Unload time (see formula)
Masking Time for a Surface = Base Mask Time + (Surface Area * Mask Time Per Area Allowance)
This is masking time per masked surface (Planar Face, Curved Wall, or Curved Surface). It is a linear function of the surface area to be masked. The cost model assumes the masking is effected with tape. Masking time per masked surface depends on the following:
• Base mask time (specified by the machine property Mask Tape Time)
• Surface area: area of the surface being masked (specified by geometry extraction)
• Mask time per area allowance (specified by the machine property Mask Time Per Area Allowance)
Masking Time for a Complex Hole = Base Mask Time + (Surface Area * Mask Time Per Area Allowance)
This is masking time per masked surface (Planar Face, Curved Wall, or Curved Surface). It is a linear function of the surface area to be masked. The cost model assumes the masking is effected with tape. Masking time per masked surface depends on the following:
• Base mask time (specified by the machine property Mask Tape Time)
• Surface area: sum of the finished areas of all the child surfaces of the hole.
• Mask time per area allowance (specified by the machine property Mask Time Per Area Allowance)
Masking Time for a Simple Hole
This is the masking time per Simple Hole GCD. The cost model assumes that the masking is effected with a plug. Masking time per masked hole is specified by the machine property Mask Plug Time.
Load Time = Number of Handling Operators * Handling Time per Operator
Load Time is the product of the following:
• Number of handling operators: this is looked up by weight in the lookup table tblHandlingTimes. Part weight is material density times part volume.
• Handling time per operator: this is interpolated from values looked up by part weight in tblHandlingTimes. Part weight is material density times part volume.
Unload Time = Number of Handling Operators * Handling Time per Operator
Unload Time is the product of the following:
• Number of handling operators: this is looked up by weight in the lookup table tblHandlingTimes. Part weight is material density times part volume.
• Handling time per operator: this is interpolated from values looked up by part weight in tblHandlingTimes. Part weight is material density times part volume.