Internal cavity cutting tool with stable support

An internal cavity cutting tool assembly comprising:

• a tool hanger assembly including a tool hanger body, a bearing assembly, and a bearing retainer plate, the tool hanger body having an elongated leg and further defined by a first surface and a second surface generally opposed to the first surface, the elongated leg having a through-bore disposed through the first and second surfaces, the through-bore further having a bearing seat, the bearing seat adapted to receive the bearing assembly, the tool hanger body adapted to receive the bearing retainer plate thereby retaining the bearing assembly within the through-bore of the tool hanger body;
• a tool body assembly including a first tool body portion and a second tool body portion, the first and the second tool body portions each having a splined bore, a cutting face having a plurality of insert pockets, a plurality of curved-edge cuffing inserts, and a stepped radial portion defined by a bearing support surface, the bearing support surface of the first tool body portion adapted to be received by the end of the through-bore in the first surface of the tool hanger body and the bearing support surface of the second tool body portion adapted to be received by the end of the through-bore in the second surface of the tool hanger body, such that the bearing support surfaces of the tool body portions oppose each other within the through-bore of the tool hanger body, each of the plurality of insert pockets disposed within the tool body portions adapted to receive one of the plurality of curved-edge cutting inserts;
• and
• a splined arbor drive assembly having a splined arbor drive shaft and an arbor support, the splined arbor drive shaft is operatively inserted though openings in a workpiece and through the splined bore of the tool body portions into the arbor support, the splined arbor drive shaft and the arbor support adapted to be retained in a device to operatively rotate the splined arbor drive assembly and the tool body assembly while precisely locating the tool hanger assembly within an internal cavity of the workpiece and sweeping the curved-edge cutting inserts disposed in the tool body portions against the portions of the workpiece to be cut, thereby producing at least one spherically cut surface within the workpiece,
• and further including means for preventing rotation of the tool body portions when the splined arbor drive assembly is disengaged from the tool body portions.