Core Potting Operation for Hand Layup
Core potting is a labor-dependent task (see
Labor-dependent and Labor-independent Tasks).
Labor Dependent Process Time =
(Number of Part’s Potted Holes * Time to Pot One Hole) /
Number of Part’s Cores
Potting is required for core regions that contain fastener holes. Potting stiffens such core regions by injecting low-density material, which hardens during curing, and prevents crushing during fastening.
Since fastener holes are not typically modeled in CAD, the total number of the part’s fastener holes is specified by the setup option
Number of Holes Potted in Honeycomb Core, which is set to 0 by default in starting point VPEs. The time to perform potting on the current core is estimated as the time required for potting for the whole part, amortized over the part’s total number of cores.
Core potting time depends on the following:
• Number of part’s potted holes: this is the number of fastener holes go through cores. By default in starting point VPEs, this is assumed to be 0. Administrators can customize the default with the cost model variable
defaultNumCorePottingRequired. Users can override the default on a per-part basis with the setup option
Number of Holes Potted in Honeycomb Core.
• Time to pot one hole: specified by the cost model variable coreHolePottingTime (40 seconds in starting point VPEs)
• Number of part’s cores: this is the total number of Core GCDs in the part.
Potting Material Cost =
(Potting Material Unit Cost * Total Potting Material Required) /
Number of Part’s Cores
Since fastener holes are not typically modeled in CAD, the cost per core of potting material is estimated as the cost of the potting material required for the whole part, amortized over the part’s total number of cores.
Consumable material cost depends on the following:
• Potting material unit cost: specified by the tool shop variable Cost Per Volume Potting Compound, specified in cost per cubic centimeters. This value is converted to cost per cubic millimeter for use in this formula.
• Total potting material required: this is the total volume of potting material required for the whole part. See formula.
• Number of part’s cores: this is the total number of Core GCDs in the part.
Total Potting Material Required =
Potted Volume per Hole * Number of Part’s Potted Holes
Total potting material required for the whole part is the product of the following:
• Potted volume per hole: the potted region is assumed to be cylindrical, with a diameter specified by the cost model variable pottingDiameterAllowance (80mm in starting point VPEs), and a height specified by the geometric property Height.
• Number of part’s potted holes: this is the number of fastener holes that go through cores. By default in starting point VPEs, this is assumed to be 0. Administrators can customize the default with the cost model variable
defaultNumCorePottingRequired. Users can override the default on a per-part basis with the setup option
Number of Holes Potted in Honeycomb Core.