This standard describes and defines variations that may occur in unassembled wormgearing. It displays mea-
suring methods and practices, giving suitable warnings if a preferred probe cannot be used. The applicability of
single or double flank composite testing is discussed, using a reference gear. Tooth thickness measurement is
shown using direct measurement as well as the use of measurements over wires or pins. Equations for the
maximum variations are given for the stated ranges, as a function of size, pitch and tolerance grade.