There isn't a machine, unless you consider this diagram from the Hein papers
(http://thelivingmoon.com/inventors_group/images/GWpics/Mach1.JPG)
Figure 6. In this gravity-like field experiment the artificial gravitational field generated would be directed along the axis of rotation.
The second component is in azimuthal direction and should accelerate the ring or disk. Therefore, energy needs not to be supplied to keep the angular velocity of the ring or disk constant.
This experimental setup could serve as field propulsion device, if a non-divergence free field were generated (the physical nature of the gravity-like field is not known at present).