Abstract: Spray assemblies for use in coating a regular or irregular internal surface of a cylinder, and methods for coating the inside of a cylinder are disclosed. The spray assemblies may include: a spray head comprising a nozzle for spraying a coating material on an internal surface of a cylinder; a support wand coupled to the spray head; and a roller sleeve rotatably connected to the support wand and configured to contact the internal surface of the cylinder and to rotate radially as the cylinder is rotated. The spray assemblies may be used to provide a consistent and repeatable coating thickness, regardless of cylinder internal diameter. In some embodiments, the spray assemblies may be used to coat the internal surface of a stator tube.

Abstract: Spray assemblies for use in coating a regular or irregular internal surface of a cylinder, and methods for coating the inside of a cylinder are disclosed. The spray assemblies may include: a spray head comprising a nozzle for spraying a coating material on an internal surface of a cylinder; a support wand coupled to the spray head; and a roller sleeve rotatably connected to the support wand and configured to contact the internal surface of the cylinder and to rotate radially as the cylinder is rotated. The spray assemblies may be used to provide a consistent and repeatable coating thickness, regardless of cylinder internal diameter. In some embodiments, the spray assemblies may be used to coat the internal surface of a stator tube.

Abstract: An apparatus for machining a profile in an inner wall of a tubular includes a frame on which a drive system is disposed, a carriage head disposed on at least one track of the frame, wherein the drive system is configured to operate the carriage head along the at least one track, a torque tube coupled to the carriage head and extending therefrom, the torque tube having a cutting tool coupled thereto, and a plurality of stabilizer pads disposed proximate the cutting tool and along a circumference of the torque tube, wherein the plurality of stabilizer pads are configured to engage the inner wall of the tubular and centralize the cutting tool within the tubular.

Abstract: Steel bit bodies are manufactured in a production process that employs polystyrene patterns in a lost foam casting process. The patterns are machined to permit the formation of complex shapes that cannot be reproduced in simple patterns that are extractable from reusable, two-piece pattern molds or dies. The patterns are machined from a billet material according to a basic, programmed, five-axis machining process to form multiple copies of a reproducible complex pattern body. The process is modified to produce multiple copies of a modified design. Machining the complex patterns and producing variations by changing the machine program permit multiple bit patterns of variable forms to be produced without need for building an intermediate, reusable pattern mold that would require multiple mold pieces, thus eliminating the associated time and expense required in the creation of a new pattern mold for each variation of the bit design.