GD&T is the only tool we have with which to manage machine part geometry perfectly. In particular, it’s the only tool we have with which to impose truly functional limits of imperfection on machine part features and actually guarantee assembly and operation prior to drawing release.
In his article for Computerworld, Paul Glen recounts that when most executives have told him that their operations require more accountability what they are really saying is that they need someone to blame.
What is GD&T? GD&T, namely “Geometric Dimensioning & Tolerancing,” is a symbolic language with which to 1) research, 2) refine and 3) ultimately “encode” the functions of each feature of a machine part by specifying permissible limits of imperfection.
Manufacturers of complex component parts understand all too well how important it is to acquire an accurate and precise scale of measurement to check their parts to specification and establish conformity with the data.