Abstract: An apparatus for in-place grinding of the inner surface of huge cylinders mprises two adjustable spider ring assemblies which support a rotating rail assembly. A cage assembly is mounted on and rotates with the rail assembly and carries a grinding unit for grinding the inner surface of the cylinder.

Abstract: A turning apparatus, intended to be mounted on a work shaft for in-place ting, may include a pair of mounting rings which are attachable to the shaft and which support a longitudinal annulate frame assembly which rotates about the area to be cut. A drive assembly is mounted on a mounting ring and engages a ring gear attached to the frame assembly for providing it rotational force. A longitudinal track assembly is mounted on and extends between the ends of the frame assembly. A carriage assembly is slidably mounted on the track assembly and is in operational engagement with a lead screw which is also mounted on the track assembly. The carriage assembly is adapted to hold a cutter for machining the shaft surface as the frame assembly rotates. A hydraulic indexing device incrementally rotates the lead screw in synchronism with the rotation of the frame assembly to move the carriage assembly and the cutter along the axis of the work piece.

Abstract: A vertical drive mechanism is provided for a cutting apparatus. The cutting pparatus can be used for in place machining of a valve seat which may include an annular turntable adapted to be rotatably mounted on the valve above the valve seat. A feed shaft is mounted through the turntable so as to be rotatable therewith, and a bottom of the feed shaft is adapted to receive a cutter for machining the valve seat. The vertical drive mechanism is mounted on the feed shaft and includes a nut threaded on the feed shaft and a gear combination. The gear combination may include a first portion which is fixedly connected to the nut, a second portion which operatively engages the first gear portion, and a third portion which operatively engages the second gear portion, the third gear portion being mounted for rotatable slidable friction engagement about the nut.

Abstract: A cutting apparatus with a vertical drive mechanism for in place machining f a valve seat which may include an annular turntable adapted to be rotatably mounted on the valve above the valve seat. A feed shaft is mounted through the turntable so as to be rotatable therewith, and a bottom of the feed shaft is adapted to receive a cutter for machining the valve seat. The vertical drive mechanism is mounted on the feed shaft and includes a nut threaded in the feed shaft and a gear combination. The gear combination may include a first portion which is fixedly connected to the nut, a second portion which operatively engages the first gear portion, and a third portion which operatively engages the second gear portion, the third gear portion being mounted for rotatable slidable friction engagement about the nut.

Abstract: Properly aligned threaded or smooth bores are machined in a pipe boss fla without requiring supplementary staging or makeshift rigs. An expandable holding sleeve is inserted in the throat of the pipe and a mounting unit is brought to rest on the outer surface of the pipe boss flange. A holding sleeve is expanded to engage the pipe and a bracket grips a projection from the mounting unit at a predetermined angular rotation while an extension of the bracket ensures a perpendicular orientation. A vertical feed mechanism mounted on the bracket directs a motor driven drill assembly through holes located in the mounting plate. After the holes and threads are machined in the pipe boss flange, the expandable sleeve is loosened and the unit is removed at a minimal time and effort expenditure.

Abstract: A lapping apparatus for in-situ grinding of valve body seats of a gate va which includes a pair of plugs which are expandable within the inlet and outlet of openings of the gate valve for retention therein, a pair of grinding discs which are rotatably mounted on the plugs with freedom of reciprocal movement along the axes of rotation for grinding the valve body seats, a rod with an enlarged end which is extendable into the valve body for engaging the grinding discs and biasing them along the axes of rotation against the valve body seats, and a tube for receiving the rod and extendable into the valve body for engaging and driving the grinding discs about the axes of rotation.

Abstract: An apparatus for machining pipe ends which includes an annular housing wh is adapted to receive a pipe end. A plurality of rods are threaded radially through the housing and are adjustable inwardly for engaging the pipe so as to enable axial alignment of the housing with the pipe end. A chuck is slidably mounted within the cylindrical housing for longitudinal reciprocal movement toward and away from the pipe end. The chuck is also rotatably mounted within the housing. A large nut may be threaded on the housing for positioning and retaining the chuck at selected locations along the longitudinal axis of the housing. One or more tool bits are located at one end of the chuck for machining the end of the pipe when the chuck is rotated within the housing.