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Percussive Drilling With Independent Rotation.

Authors
UNGER-HF; FUMANTI-RR
Source
NTIS: PB 213 953 :21 pages
Link
NIOSHTIC No.
10001746
Abstract
The Bureau of Mines conducted drilling experiments in the laboratory with a commercially available percussive drill that has an independent rotational system. Eight rock types with a wide range of physical properties were drilled under several combinations of rotational speed, drilling thrust, and operating pressure. Penetration rates and energy per unit volume correlated well with the coefficient of rock strength as shown graphically. Size- distribution analyses of some of the drill cuttings show how particle size varies with rotation speed and rock hardness. In general, changing the rotational speed has a greater influence on the penetration rate in softer rocks, with penetration rate increasing with increasing rotational speed.
Publication Date
19720101
Document Type
IH; Report of Investigations
Fiscal Year
1972
NTIS Accession No.
PB-213953
NTIS Price
A03
Identifying No.
RI 7692
NIOSH Division
TCRC;
Source Name
NTIS: PB 213 953
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