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Development of a Quiet Rock Drill. Volume 1 - Evaluation of Design Concepts.

Authors
Hawkes-I; Wright-DD
Source
NTIS: PB 283 774 Available for Reference At Bureau Libraries :95 pages
Link
NIOSHTIC No.
10000183
Abstract
This report describes the results of a study to evaluate new design concepts for percussive rock drills that will result in quieter machines. It is shown that by incorporating such features as an efficient muffler, a plenum chamber integral with the machine body, and shroud tubes around the drill rods, etc., noise levels are reduced from about 114 decibels, a-weighted network (dba) to about 95 dba with very little change in drilling performance.
Publication Date
19770101
Document Type
CP; Final Contract Report;
Fiscal Year
1977
NTIS Accession No.
PB-283774
NTIS Price
A06
Identifying No.
OFR 70-78
NIOSH Division
PRC;
Source Name
NTIS: PB 283 774 Available for Reference At Bureau Libraries
Performing Organization
Ivor Hawkes Associates
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