Portable on-site turning apparatus

A turning apparatus for in-place machining of the surface of a shaft, comprising:

• a pair of mounting rings;
• radially adjustable means for mounting the rings on the shaft in a concentric spaced relationship thereto;
• a longitudinal annulate frame assembly having opposite ends wherein each end is slidably mounted in a respective mounting ring so that the frame assembly can be coaxially positioned on the shaft and rotated;
• drive means mounted on at least one mounting ring and operatively coupled to the frame assembly for driving the frame assembly;
• a longitudinal track assembly mounted on and extending between the ends of the frame assembly for rotation therewith, said longitudinal track assembly including:
• longitudinal support means having two ends and a plurality of longitudinal orthogonal projections;
• a longitudinal bushing shaft attached to each projection;
• and
• retaining means on said frame assembly having a plurality of cylinders adapted for telescopic sliding engagement with the bushing shafts;
• a lead screw rotatably mounted on the track assembly and extending between the ends of the frame assembly;
• a carrying means mounted on the track assembly for slidable movement therealong and adapted to receive a cutter for machining the shaft;
• means mounted on the carrying means for threaded engagement with the lead screw;
• and
• indexing means for incrementally rotating the lead screw in synchronism with the rotation of the frame assembly to thereby move the carriage assembly along the frame assembly.