As to whether or not you need it, I can’t answer as I’m not intimately familiar with your particular design.Īll of the form controls (flatness, straightness, circularity and cylindricity) as well as general tolerance of size are governed by Rule #1. You’ve hit upon one of the few ways that the Rule #1 (perfect form at MMC) can be overruled. The tabletop may be within flatness tolerance but would not be parallel to the floor. Think of a table with two missing legs at an angle to the floor. Parallelism uses a datum to control a surface while flatness does not. Table using the GD
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