Like in case of parts that will be welded (thermal stress), bolted (bending due This not only control the rock butĪlso the allowable mechanical stress which deform the shape of the sheet metal Is often controlled with Flatness tolerance. Many other ways to check the flatness like using CMM, light bands etc. The dial indicator moved over the surface and the readings will be checked against tolerance value. Using Level plate and surface Plate – Component is placed on the level plate which is perfectly levelled on surface plate using the adjusters in level plate. Below are the fewĮxamples of how the flatness checking is done. It is loose or tight tolerance? Equipment availability etc. of parts we need verify? Batch verification? Whether Each process is well suited for different Each process have tolerance limitation.Įxponentially in case of tight tolerances. Consider the following points to arrive at the reasonable flatnessĭifferent manufacturing process like milling, drilling, reaming, band sawĬutting etc. But how to select the reasonable tolerances without burn a hole in Perfectly designed your part in CAD and produced the pretty good drawing with Instable within the limit of 0.2mm Reasonable flatness tolerance You apply Flatness tolerance as 0.2mm then all its relative features will Make into near perfect feature to use as reference. It is because flatness will minimize the instability You control the surface with flatness, that particular surface is used as Want to control and also the size of the tolerance zone. Geometric tolerance value is calculated based on the size of the feature you
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