in a pipe cutting device , a stationary chuck for holding a workpiece is connected to a bearing housing , the chuck and bearing housing are in axial alignment . a ring is concentrically mounted within the bearing housing and a cutting support is eccentrically pivotally mounted in the ring and carries a cutting member . the cutting support can be pivoted between a rest position with the cutting member spaced from the workpiece to a cutting position with the cutting member in contact with the workpiece . from the cutting position , the cutting support engages and drives the ring so that both the cutting support and ring move along a concentric path about the workpiece for effecting the cutting operation .