A regenerative fluid dynamic machine, typically a blower or compressor, includes an impeller with fixedly attached blades which may be radial or curved in a general convex fashion facing forward in the direction of turning. The acoustic vector sensors may be part of a string of acoustic sensors for acoustic or seismic surveys of subsurface formations, or may also be coupled to downhole devices for which orientations need to be know. Three lenslet arrays in each of the three beam paths produce corresponding Hartmann grids. The rear side of the backrest has pivotally attached, laterally, telescoping arms, each supporting a floating pulley with a cable looped through it with one end of the cable connected to a system of pulleys with spring resistance, and the other end of the cable, having a handle that can be pulled by the users hands or extended to the feet. The flexible pieces are connected to the light emitting units respectively to form a plurality of electrical transmission paths. A router bit positioning system for aiding in establishing a pre-determined bit depth may be included.