Noise Reduction of Jumbo Mounted Percussive Drills: Phase I, Noise and Usage Survey.
NTIS: PB/265-083 Available for Reference At Bureau Libraries :82 pages
Four drills--Gardner-Denver D93lAR and DH123, and Ingersoll-Rand D475 and VL120 models--were measured at the two manufacturers' test sites; data are given in terms of characteristic noise and vibration levels. A survey of percussive rock drill users is reported. The rationale for the choice of a demonstration drill, the Gardner- Denver DH123, is given and a desired noise reduction goal is established.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/265-083 Available for Reference At Bureau Libraries
Bolt, Beranek and Newman Inc.