Abstract: This invention relates to a chuck assembly for use with veneer lathes. In veneer lathes, a log is rotated against a blade for stripping a thin sheet of wood called veneer. Rotation of the log against the blade is compelled by paired chuck assemblies at opposite ends of the log. Each chuck assembly includes a spindle adapter and a chuck, both for driving rotation about the axis of rotation of the log. An improved driving interface between the spindle adapter and chuck is disclosed, extending along a plane normal to the axis of rotation. The chuck has a driving interface along a plane normal to the axis of rotation. This chuck driving interface defines keys, which keys preferably extend radially from the axis of rotation and protrude outwardly interrupting the plane of the driving interface. The spindle adapter has a complementary driving interface along a similar plane normal to the axis of rotation.