2/17/2017 Worst Case Assembly Tolerance Stack Up Analysis Calculation Example TutorialWORST CASE METHOD ASSEMBLY TOLERANCE STACK UP CALCULATION FOR NON- SYMMETRIC DIMENSIONAL TOLERANCES WITH EXAMPLE 1 shares Gopinath K (http://blog.mechguru.com/author/gopinath/) December 30, 2014 No comments (http://blog.mechguru.com/machine-design/worst-case-method-assembly-tolerance-stack-calculation-non-symmetric-dimensional-tolerances- example/#respond) 1 If you are wondering what is stackup analysis/calculation, the answer is determining worst case scenario. Moreover, the problem can sorted out in early 1092 Oakridgers in Top stages of design rather than undergoing prototyping and finding out the issue. Universities 0 We have already discussed how to do worst case method assembly tolerance stack up calculation for symmetric dimensional tolerances 0 (http://blog.mechguru.com/machinedesign/assemblytolerancestackcalculation4stepsexample/), in this tolerance analysis tutorial we will discuss about nonsymmetric tolerances. A dimension represented on an engineering drawing has nominal dimensions with tolerances. (Ex: 25±0.2). In this simplified example, maximum limit of the part dimension can be upto 25.2mm and minimum can be up to 24.8mm, provided the mating component is designed to cater to this requirement. Tolerance basis system: There are certain terminologies associated with tolerance stack up such as basic size, allowance, interference, deviation (http://blog.mechguru.com/machine design/diniso286standardtolerancezonesizetabledifferentgradesnominalsize/) etc., Let us take a look about the limit system which determines what to change and what to not. Typically, there are two two limit systems. 1.Basic Hole system 2.Basic shaft system (http://blog.mechguru.com/machine-design/din-iso-286-tolerance-fundamental-deviation-tables-shaft/) Out of these any one of the system may be adopted. Both these systems implicate that, tolerances/fits can be obtained by keeping tolerance on one mating surface unchanged while changing the tolerance on the other. In a basic hole system, the hole dimension is kept unchanged while the tolerance on the shaft is changed and is the case in basic shaft system, keeping the shaft dimension unchanged. Tolerance grades (http://blog.mechguru.com/machinedesign/diniso286standardtolerancezonesizetabledifferentgradesnominalsize/): Indian Standard of Limits & Fits include 16 grades of fundamental tolerance. These grades are represented as IT 01, IT02………..IT 16. Worked out Example: Let us take a simple example to find out how this is done. Consider a component which needs to have some overhang (min.3mm) after assembled. http://blog.mechguru.com/machinedesign/worstcasemethodassemblytolerancestackcalculationnonsymmetricdimensionaltolerancesexample/ 1/4 com/category/machine-design/) Tagged Tolerance StackUp (http://blog.com/machine- design/worst-case-method-assembly- tolerance-stack-calculation-non- symmetric-dimensional-tolerances- example/attachment/worst-case- assembly-tolerance-stack-up- calculation-for-non-symmetric- tolerance/) Worst Case Assembly Tolerance Stack Up 1 Calculation for Non Symmetric Tolerance shares 1 Table.2 -0.B + Max.1: Calculation table for worst case tolerance stack up for the above example Tolerance Descripĕon Basic size Maximum Minimum 0 Max.4 28.com/machinedesign/worstcasemethodassemblytolerancestackcalculationnonsymmetricdimensionaltolerancesexample/ 2/4 . After assembly deviations/deflections AZ Nanoparticles/Nanopowders Element. One who always wanted to share the knowledge gained of both technical and non-technical aspects.A + Max.3 49.5 0 98.5 98 Calculated Overhang Value 6.A + Min. C)] In this case.mechguru. Temperautre/Pressure of the part at which it is operayed 2.com/tag/tolerance-stackup/) POST NAVIGATION DFMEA Creation Tutorial with Example (http://blog.mechguru. Not taking into account wear & tear 3. Posted in Engineering design (http://blog. stackup calculations has some shortcomings such as 1.2 15.1 15.mechguru. However.2 27.B + Min.com/author/gopinath/) Gopinath is a Design Engineer by profession and a writer by passion.2/17/2017 Worst Case Assembly Tolerance Stack Up Analysis Calculation Example Tutorial (http://blog. Go to nanoamor. minimum overhang is the worstcase scenario and which meets our intended length. D – (Max. Nitride & Oxide; Carbon Nanotubes. C)] Minimum Overhang of the part = [Min. Graphene & Dispersions. D – (Min.6 C 15 +0.5 50.com/machine-design/bolted-joint-design-calculation- http://blog. Bolted Joint Design Calculation Example for Joint in Tension design/dfmea-creation-tutorial-example/) (http://blog.mechguru.3 -0.mechguru.mechguru.3 4.com/machine. Carbide.5 B 28 +0.2 +0. Min.3 Required formulas: Maximum Overhang of the part = [Max.1 D 98 +0.mechguru. 0 A 50 +0. This is the simplest way of statistical approach towards Stackup calculation.com About Gopinath K (http://blog. mechguru.facebook.com/assignmentHelp1) (https://plus.com/Mechguru) To get the latest post directly to your email box.com/115202504365723852297) Llorix One Lite (http://themeisle.com/themes/llorix-one/)powered byWordPress (http://wordpress.google.com/machinedesign/worstcasemethodassemblytolerancestackcalculationnonsymmetricdimensionaltolerancesexample/ 3/4 .org/) http://blog. (http://blog.com/MechGuru-169738679744717/) (https://twitter.mechguru.com/contact/) (https://www.feedburner. 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