Development of a Boring Machine Cutter Instrumentation Program.
NTIS: PB/222-137 Available for Reference At Bureau Libraries :149 pages
An experimental study was performed in which three disk cutters of a tunnel boring machine were instrumented to measure dynamic forces and moments experienced by the cutters during full-scale boring operations. The boring machine used was an 18-ft-diamter robbins mole. Strain gages were installed within the fixed shafts about which the cutters rotate, and dynamic force data were recorded as the machine bored a 12-ft length of tunnel in shale. Geological cores were taken in the bored section, tested for strength and hardness, and compared with similar data from other areas of the tunnel. Cutter force measurements were taken in analog form and recorded on magnetic tape. Representative samples of the analog data were subsequently digitized and reduced to statistics that summarize the four channels of dynamic data recorded for each cutter. A review of the conduct of the technical program is provided. The instrumentation approach is described and details of the system components are presented. All results are documented in tabular and/or graphical form.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/222-137; Available for Reference At Bureau Libraries
United Aircraft Res. Lab.