Title: Portable boring bar

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Abstract: A small compact and light-weight tool is provided which is capable of boring and honing in-situ the seal ring seats of different sizes of high pressure valves. The tool housing support is threaded so that after removal of the valve stem and bonnet the tool may be screwed into the valve body. The support housing is internally threaded throughout its entire length for receiving and mating with an externally threaded feed screw. The feed screw is essentially a hollow cylinder having bearings therein for rotatably supporting a drive shaft. The drive shaft is adapted at one end to be driven and is adapted at the other end to receive the cutting tool holder, the cutting tool holder extending into the valve when the tool is mounted thereon. An internally threaded positive stop ring engages the feed screw and the setting of the stop ring determines the maximum depth of boring. Boring is accomplished by rotating the drive shaft to thereby rotate the cutting tool while axially advancing the drive shaft by rotating the feed screw. The stop ring engages the support housing to stop axial advancement of the feed screw and the drive shaft when the desire depth of boring has been accomplished.


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