This paper investigates the following present globoidal wormgear drives: (1) original and modified Hindley wormgear drives; (2) Wildhaber worngear drive with inclined plane teeth of wormgear; (3) inclined plane and cone enveloping globoidal wormgear drives; (4) piane@ cone and inverted cone enveloping globoidal wormgear drives based on Sakai's theory. Meanwhile@ a new approach for generation of Hindley wormgearing@ and plane and cone enveloping globoidal woxmgear drives is developed in this paper. Contact lines@ dual and single contact ratios@ relative curvature radii@ meshing angles between tangents of contact lines and relative velocities@ and sliding ratios of wormgear tooth surfaces of the above globoidal wormgear drives are studied by computerized simulation for numerical examples.