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Drilling Machines, Surface.

Authors
Morrell-RG; Unger-HF
Source
Surface Subsect 11 4 in SME Min Eng Handbook 1973 1:11-24--11-56
Link
NIOSHTIC No.
10001762
Abstract
This article on surface drilling machines thoroughly describes rotary and percussive (both downhill and surface-mounted) drilling techniques. The discussion is limited to primary blasthole drilling as practiced in open pit, quarry, and stripping operations. Although primary blastholes usually are drilled vertically, angle holes are also common, and most blasthole drill rigs, therefore, have angle drilling capability. A few rigs are designed to drill horizontal holes for overburden removal, but these are limited in number. Most blasthole drill rigs use either rotary, percussive, or rotary-percussive drilling methods, with jet piercers used to a limited extent. Since all blasthole drills are designed for high production, they feature fast drilling, rapid tramming, quick setup, automatic drill steel handling, and rapid hoisting and lowering speeds.
Publication Date
19730101
Document Type
OP;
Fiscal Year
1973
NTIS Accession No.
NTIS Price
Identifying No.
OP 18-74
NIOSH Division
TCRC;
Source Name
Surface Subsect. 11.4 in SME Min. Eng. Handbook, V. 1, 1973, PP. 11- 24--11-56
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