Category: Location

by GD&T Guy on December 22, 2014.

Position is one of the most useful and most complex of all the symbols in GD&T. The two methods of using Position discussed on this page will be RFS or Regardless of Feature Size and under a material condition (Maximum Material Condition or Least Material Condition). Position is always used with a feature of size.

by GD&T Guy on December 15, 2014.

GD&T Symbol:  Relative to Datum: Yes MMC or LMC applicable: No Drawing Callout: Description: Concentricity, sometimes called coaxially, is a tolerance that controls the central axis of the referenced feature, to a datum axis. The axes for the datum and referenced feature are derived from the median points of the part or feature. Concentricity is…

by Tommy on November 4, 2014.

GD&T Symbol:  Relative to Datum: Yes MMC or LMC applicable: No Drawing Callout:   Description: GD&T Symmetry is a 3-Dimensional tolerance that is used to ensure that two features on a part are uniform across a datum plane. An established “true” central plane is established from the datum and for the symmetry to be in tolerance,…