Pipe lathe and subassembly therefor

A pipe lathe for machining a work piece, said work piece having a perimeter, said pipe lathe comprising:

• a segmented base ring structured to be removably coupled to said work piece;
• a drive gear assembly coupled to said segmented base ring;
• a plurality of bearing assemblies;
• and
• a subassembly comprising:
• a gear ring including a first side having a bearing slot, a second side disposed opposite the first side, and a plurality of teeth, said bearing slot receiving at least a portion of each of said bearing assemblies, wherein said teeth of said gear ring cooperate with said drive gear assembly to rotate said subassembly about the perimeter of said work piece;
• a separate ring member comprising a first side facing the second side of said gear ring, a second side disposed opposite the first side of said separate ring member, said separate ring member structured to be fastened to said gear ring such that said separate ring member rotates with said gear ring but not independently with respect thereto;
• at least one tool mounting portion disposed on the second side of said separate ring member, said at least one tool mounting portion being structured to mount a number of tool assemblies for machining said work piece;
• and
• wherein said separate ring member of said subassembly further comprises a plurality of segments and number of coupling mechanisms;
• wherein each of said segments is structured to extend around or within a corresponding portion of the perimeter of said work piece;
• and wherein said coupling mechanisms couple said segments together.

A pipe lathe for machining a work piece, said work piece having a perimeter, said pipe lathe comprising:

• a segmented base ring structured to be removably coupled to said work piece;
• a drive gear assembly coupled to said segmented base ring;
• a plurality of bearing assemblies;
• and
• a subassembly comprising:
• a gear ring including a first side having a bearing slot, a second side disposed opposite the first side, and a plurality of teeth, said bearing slot receiving at least a portion of each of said bearing assemblies, wherein said teeth of said gear ring cooperate with said drive gear assembly to rotate said subassembly about the perimeter of said work piece;
• a separate ring member comprising a first side facing the second side of said gear ring, a second side disposed opposite the first side of said separate ring member, said separate ring member structured to be fastened to said gear ring such that said separate ring member rotates with said gear ring but not independently with respect thereto;
• at least one tool mounting portion disposed on the second side of said separate ring member, said at least one tool mounting portion being structured to mount a number of tool assemblies for machining said work piece;
• and
• wherein said segmented base ring comprises an annular recess and a spacer ring;
• and wherein said spacer ring is disposed in said annular recess between said segmented base ring and the first side of said gear ring of said subassembly.