Development of Prototype Quiet Hard Rock Stoper Drill - Volume II.
NTIS: PB/86-165073 :37 pages
This report describes the design and testing of an improved quiet hard-rock percussion drill. The improved drill incorporates a tappetless design with independent rotation in a handheld drill weighing 50 lb. Laboratory and field testing in three mines were conducted. The testing showed improved drilling performance with no increase in measured noise levels over the first design.
CP; Final Contract Report;
NTIS Accession No.
Creare Products, Inc.