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Manual or Spreadsheet Analysis |
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| Accuracy – Formula Derivation |
User must manually define loop and dimension nominals | Stack up loop automatically created from assembly model |
| Type of Analysis | Typically just worst-case or RSS | Supports worst-case, RSS, and generalized statistical results |
| Standardized Method | Can be modified. Can have multiple appearances |
Consistent – all analyses use same format, same mathematics |
| Identification of optimum dimensioning scheme | None | Stack up definition starts with the optimum dimensioning scheme |
| Assembly shift between parts having clearance | Must be manually calculated | Automatically included |
| Manage Multiple Stack ups | Each is typically independent unless much effort is made to tie the stack ups together | Automatically manages the fact that a dimension can contribute to more than one stack up |
| Geometric Tolerances | Requires user expertise in the standard and how to calculate both worst-case and statistically | Logic for proper treatment embedded into the program – user not required to have deep understanding of standards |
| Warning that the problem may not be 1D | None | Yes |
| Report Generation | User must prepare and capture desired image from CAD models | “Snapshot” automatically captures image to include in reports |
| Visualized Closed Loop | Manually added to the captured image or shown prior to image capture | Always presented when working on a stack up and included in snapshot |
| Easy Identification of Top Contributors | Not usually included | Automatic |
| Quality Dashboard | Manually included if at all | Summary table shows results of each stack up along with a roll-up quality summary |
