Matches in SemOpenAlex for { <https://semopenalex.org/work/W1591301957> ?p ?o ?g. }
Showing items 1 to 65 of
65
with 100 items per page.
- W1591301957 abstract "The Phase I report documents the effort expended by the Washington State University (WSU) research team towards meeting the terms of the contract and provides a working document for the research team during the later phases of this research project. The flexible shaft drill concepts for thin seam coal were based upon operational specifications prepared by the WSU research team after consultation with the Coal Mine Productivity Task Force of the US Steel Corporation. Investigations disclosed that a flexible shaft drill should be designed to withstand a torque load of 3000 in.-lb, a thrust load of 6000 lb, a mean feed rate of 3 ft/min (feed rate range should be 1 to 6 ft/min), withdrawal rate of 40 ft/min, and have the ability to drill an 8-ft deep hole within +- 10/sup 0/ of the vertical centerline. In order to maintain this alignment, a straight starter section would be used at the drill bit end of the drill. The length of this starter section varies with hole tolerance; based on drill hole measurements in soft, semi-consolidated shale a minimum starter section length of about 9 in. was chosen. After considering a number of alternative types of flexible shafts, it was concluded that the flexible shaft should be made up of short rigid segments interlocked at their interfaces with intermeshed teeth. Three interlocking clutch teeth at the interface were selected because to increasing the number of clutch teeth would increase the stress in each tooth to a prohibitively high level. Segments should have some restraining devices at the connecting interfaces preventing the segments from separating. This interfacial restraint should allow the segments to transmit tension loads across the interface. This is desirable so that the drill string can be withdrawn from the hole by applying tensile force to the segments." @default.
- W1591301957 created "2016-06-24" @default.
- W1591301957 creator A5010655738 @default.
- W1591301957 creator A5043247823 @default.
- W1591301957 date "1977-08-30" @default.
- W1591301957 modified "2023-10-05" @default.
- W1591301957 title "Flexible roof drill for low coal. Volume 1. Phase I and Phase II" @default.
- W1591301957 doi "https://doi.org/10.2172/6514622" @default.
- W1591301957 hasPublicationYear "1977" @default.
- W1591301957 type Work @default.
- W1591301957 sameAs 1591301957 @default.
- W1591301957 citedByCount "0" @default.
- W1591301957 crossrefType "report" @default.
- W1591301957 hasAuthorship W1591301957A5010655738 @default.
- W1591301957 hasAuthorship W1591301957A5043247823 @default.
- W1591301957 hasBestOaLocation W15913019572 @default.
- W1591301957 hasConcept C108615695 @default.
- W1591301957 hasConcept C121332964 @default.
- W1591301957 hasConcept C127413603 @default.
- W1591301957 hasConcept C16674752 @default.
- W1591301957 hasConcept C173736775 @default.
- W1591301957 hasConcept C192562407 @default.
- W1591301957 hasConcept C20556612 @default.
- W1591301957 hasConcept C2778844933 @default.
- W1591301957 hasConcept C30358287 @default.
- W1591301957 hasConcept C518851703 @default.
- W1591301957 hasConcept C548081761 @default.
- W1591301957 hasConcept C62520636 @default.
- W1591301957 hasConcept C66938386 @default.
- W1591301957 hasConcept C78519656 @default.
- W1591301957 hasConcept C79420006 @default.
- W1591301957 hasConceptScore W1591301957C108615695 @default.
- W1591301957 hasConceptScore W1591301957C121332964 @default.
- W1591301957 hasConceptScore W1591301957C127413603 @default.
- W1591301957 hasConceptScore W1591301957C16674752 @default.
- W1591301957 hasConceptScore W1591301957C173736775 @default.
- W1591301957 hasConceptScore W1591301957C192562407 @default.
- W1591301957 hasConceptScore W1591301957C20556612 @default.
- W1591301957 hasConceptScore W1591301957C2778844933 @default.
- W1591301957 hasConceptScore W1591301957C30358287 @default.
- W1591301957 hasConceptScore W1591301957C518851703 @default.
- W1591301957 hasConceptScore W1591301957C548081761 @default.
- W1591301957 hasConceptScore W1591301957C62520636 @default.
- W1591301957 hasConceptScore W1591301957C66938386 @default.
- W1591301957 hasConceptScore W1591301957C78519656 @default.
- W1591301957 hasConceptScore W1591301957C79420006 @default.
- W1591301957 hasLocation W15913019571 @default.
- W1591301957 hasLocation W15913019572 @default.
- W1591301957 hasLocation W15913019573 @default.
- W1591301957 hasOpenAccess W1591301957 @default.
- W1591301957 hasPrimaryLocation W15913019571 @default.
- W1591301957 hasRelatedWork W1235466188 @default.
- W1591301957 hasRelatedWork W2349934926 @default.
- W1591301957 hasRelatedWork W2356133300 @default.
- W1591301957 hasRelatedWork W2356245922 @default.
- W1591301957 hasRelatedWork W2357430960 @default.
- W1591301957 hasRelatedWork W2359671756 @default.
- W1591301957 hasRelatedWork W2384547103 @default.
- W1591301957 hasRelatedWork W2393086502 @default.
- W1591301957 hasRelatedWork W2982754647 @default.
- W1591301957 hasRelatedWork W2998504172 @default.
- W1591301957 isParatext "false" @default.
- W1591301957 isRetracted "false" @default.
- W1591301957 magId "1591301957" @default.
- W1591301957 workType "report" @default.