[信息與通信]tolerance_spreadsheetii(編輯修改稿)
2025-01-30 23:23 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 ps that help (reduce system required gap / increase nominal gap for standard analysis) Spreadsheet OUTPUT ? Output (standard analysis) ? Nominal: the sum of you dimensions minus shifts ? Systol: ? For RSS: RSS of tolerances ? For SRSS: RSS of normal portions of tolerances plus sum of shifted portions. ? For WC: sum of tolerances ? Max: nominal plus systol Min: nominal minus systol Spreadsheet OUTPUT ? Output (tolerance focused analysis) ? Reqgap: (set your gaps to this value for a sixsigma design) ? For RSS: RSS of tolerances plus shifts ? For SRSS: RSS of normal portions of tolerances plus sum of shifted portions plus shifts ? For WC: sum of tolerances plus shifts Spreadsheet OUTPUT ? Choice between RSS / SRSS / WC ? Worst Case: If max tolerance contribution is greater than or equal to 50% ? SRSS: If max tolerance contribution is between 50% and 25 % ? RSS: If max tolerance contribution is less than or equal to 25% Spreadsheet OUTPUT ? Getting Sigma level for a desired gap: ? Step1: Enter a desired gap (tfa) (desired system tol for standard analysis) ? Step2: Press “Get sigma” (the spreadsheet will iterate system sigma until the desired gap is met) ? Step3: Evaluate results (Sigma level and PPM) Spreadsheet OUTPUT ? Compression Analysis ? Inputs ? Input seal height ? Input interference (tfa only else interference equals nominal) ? Outputs ? Minimum, maximum, and nominal percent pression Spreadsheet OUTPUT ? Other outputs ? KRSS ? DRSS ? Industry Results Spreadsheet OUTPUT ? Documenting Analysis ? Comments: Add ments and conclusions regarding the results of the analysis. ? Sketch showing loop equation: Add screen dump of cross section from ProE. Use Excel’s drawing tools to show dimensions used in analysis. Other Useful Tools ? Other Sheets ? Simulation: Simulate dimensional data and predict cpk of system tolerances. Compare effectiveness of RSS / SRSS / WC ? 2D 3D: Calculate clearances between two points in 2 and 3 dimensions ? Industry data sheets: ? DIN16901 ? ISO 3302 ? NADCA ? ScrewMachine ? Machined ? SheetMetal ? Stampings ? PCB ? Extrusions Other Useful Tools ? Simulation: Inputs ? Spec: enter spec dimensions. Use “add DIM” button to add additional dimensions. ? 6s tol: enter spec tolerances ? Kstddev : used to generate random mean shift about spec. Hitting “recalculate” or F9 will calculate another random set of data. ? K (used in SRSS) : k = 1 is 100% shift and SRSS will be equal to WC. K=0 is 0 shift and SRSS
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