The ground bit consists of a huge cube with a pair of roller bearings between the inner and outer rings, in which at least one or more rings are connected between the roller bearings and the roller bearings; and Install a cone on the connecting foot.

摘要

A Drill to Earth, comprising a Shaft carries a Unit Cube, which has a pair of Roller Bearings placed between Inner and Outer Rings of Rolling,Including at least one of the two or more Rings interconnected Parts, Bearings and Thrust ring; a method for mounting a Cone on a leg of the Connection.