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Book Water jet assisted Cutting

Download or read book Water jet assisted Cutting written by and published by . This book was released on 1985 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Greater mining productivity requires a more efficient cutting process. The cutting force available from today?s mining machines has been optimized with respect to machine size and weight. Researchers have shown that when employing water-jet-assisted cutting, bit forces and drum torques can be reduced significantly, which may allow mining machines to become lighter and more efficient. The Bureau of Mines has initiated a program to develop a water- jet-assisted rotary cutting system using the conventional bit assisted by a directed water jet operating at moderate pressures (3,000 to 10,000 psi). This water-jet-assisted cutting system has the potential to improve cutting efficiency without increasing machine horsepower or water usage (beyond what is presently used for dust control) or requiring fundamental changes in mining practice. IR addition to improvements in productivity, other anticipated benefits of water-jet cutting include reduced generation of respirable dust, elimination of frictional ignitions, increased bit life, reduced fines, and fewer machine vibrations. The papers presented at this open industry meeting discuss the development of water-jet-assisted cutting technology and future application of this technology to a variety of mining techniques including roof drilling and longwall mining.

Book Application of Water Jet Assisted Drag Bit and Pick Cutter for the Cutting of Coal Measure Rocks Final Technical Report Tests of Combination in Different Rocks

Download or read book Application of Water Jet Assisted Drag Bit and Pick Cutter for the Cutting of Coal Measure Rocks Final Technical Report Tests of Combination in Different Rocks written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A laboratory investigation was made of the effects of high pressure water jets on the cutting forces of drag bit cutters in sedimentary rocks. A hard and soft sandstone, shale and limestone were tested with commercially obtainable conical and plow type drag bits on the EMI linear cutting machine. About 1200 cuts were made at different bit penetration, jet orientation, and water pressure to determine the reduction of cutting forces on the bit from the use of the water jet. Both independent and interactive cutting was used. The greatest reduction in cutting forces were with both of the sandstones; the drag forces were reduced about 30 percent and the normal forces about 60 percent at 5000 psi water pressure with the nozzle behind the bit. The method was less effective in the shale, except at 10,000 psi water pressure the reduction in drag force was about 55 percent. Of the rocks tested, the limestone was least affected by the water jet. The cutting forces for the plow bit showed continuous change with wear so a machined conical bit was used for most of the testing. Tests with the plow bit did show a large reduction in cutting forces by using the water jet with worn bits. An economic analysis of equipping a drag bit tunnel boring machine indicated that the water jet system could reduce costs per foot in sandstone by up to 40 percent.

Book A Review of Water jet assisted Rock Cutting

Download or read book A Review of Water jet assisted Rock Cutting written by Michael Hood and published by . This book was released on 1990 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Bureau of Mines Research

Download or read book Bureau of Mines Research written by United States. Bureau of Mines and published by . This book was released on 1988 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Information Circular

Download or read book Information Circular written by and published by . This book was released on with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book New Publications

Download or read book New Publications written by United States. Bureau of Mines and published by . This book was released on 1982 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Fossil Energy Update

Download or read book Fossil Energy Update written by and published by . This book was released on 1984 with total page 878 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Review of Desliming Methods and Equipment

Download or read book Review of Desliming Methods and Equipment written by Christopher H. Roe and published by . This book was released on 1984 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Department of the Interior and related agencies appropriations for fiscal year 1986

Download or read book Department of the Interior and related agencies appropriations for fiscal year 1986 written by United States. Congress. Senate. Committee on Appropriations. Subcommittee on the Department of the Interior and Related Agencies and published by . This book was released on 1985 with total page 1018 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book List of Bureau of Mines Publications and Articles with Subject and Author Index

Download or read book List of Bureau of Mines Publications and Articles with Subject and Author Index written by United States. Bureau of Mines. Office of Public Information and published by . This book was released on 1985 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book List of Bureau of Mines Publications and Articles with Subject and Author Index

Download or read book List of Bureau of Mines Publications and Articles with Subject and Author Index written by United States. Bureau of Mines. Branch of Editorial Services and published by . This book was released on 1985 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: