as shown in fig7 comprises a self aligning flange 200 the flange 200 is non rotatably supported within the support member 60 by radially extending retaining members or protrusions 260 adapted to mate with the gaps 270 in the support housing 60 the flange 200 may comprise a rim 201 that is a sectional ellipsoid or sphere the protrusions 260 are sized within the gaps 270 such that the flange 200 is moveable about three axes relative to the support housing 60 limited only by the tolerance of the gaps 270 relative to the protrusions 260 the protrusions 260 are sufficiently sized such that rotational forces due to operation of the first motive force means 100 and the rotational cutting member 30 are fully transferred to the frame 20 while allowing the flange 200 some tolerance of motion about at least one axis preferably some tolerance of motion is allowed about at least three axes the means for rotating the cutting member 30 comprises a motive force means 100 the motive force means 100 may comprise a motor and gear box 110 alternatively the motive force means comprises hydraulic or other components adapted to provide a rotational force to the cutting member 30 the motive force means.