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boring machine |
Also found in: Wikipedia | 0.02 sec. |
boring machineMachine tool for producing smooth and accurate holes in a workpiece by enlarging existing holes with a cutting tool, which may bear a single tip of steel, cemented carbide, or diamond or may be a small grinding wheel. The hole's diameter is controlled by adjusting the boring head. Bored holes are more accurate in roundness, concentricity, and parallelism than drilled holes. Boring machines used in toolmaking shops have a vertical spindle and a work-holding table that moves horizontally in two perpendicular directions so that holes can be accurately spaced. In mass-production plants, boring machines with multiple spindles are common. See also drill; drill press; lathe. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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A tunnel boring machine will bore one tunnel from 96th to 63rd streets and a second tunnel from 96th to 72nd streets. An automated boring machine is already being used in PCS's Rocanville mine, new waste management applications are being studied and improved backfill technology is being developed. A construction foreman who hopped into a trench to check on a malfunctioning boring machine was crushed to death Wednesday when the 5-ton device suddenly came off its track and hit him, officials said. |
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