Note that just because the surface may have a nominal angle on your CAD or drawings, the two planes need not be oriented at that exact angle, as long as they are parallel to one another. between these two parallel planes) the part is a ‘pass’. If all measured points on the surface lie within the tolerance band (i.e. The flatness tolerance zone is visualised as two parallel planes, spaced apart by the number indicated in the flatness control. a zonal flatness of ‘x’ microns per millimetre). Flatness may be expressed as a local rate over a larger area (e.g. ![]() As well as on 2D prints, you may also encounter flatness callouts directly in a 3D CAD model.Ī flatness callout with no other information should be interpreted to mean that the flatness control applies to the entire surface. Keep in mind that a flatness measurement is almost always a 2D measurement in 3D space (it is sometimes measured using a 1D curvilinear scanning path, although this gives limited coverage). Register and download Now Drawing calloutĪ typical flatness callout on a drawing print (2D views) is shown below: ![]() Download Keep our complete GD&T eBook as a reference.
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