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Drill - Wikipedia
A magnetic drill is a portable machine for drilling holes in large and heavy workpieces which are difficult to move or bring to a stationary conventional drilling machine. It has a magnetic base and drills holes with the help of cutting tools like annular cutters (broach cutters) or with twist drill bits.
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Drill machine at coal mines - YouTube
18-10-2019 · Powerful drill machine
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(PDF) Straight hole drilling machines for coal mines
Straight hole drilling machines for coal mines. Article (PDF Available) ... coal and in rocks using drill bits and rolling cutter bits, essential axial forces and torsion are applied on .
Drilling Machines - EOLSS
CIVIL ENGINEERING – Vol. II - Drilling Machines - H.Watanabe ©Encyclopedia of Life Support Systems (EOLSS) Recently, many percussion rock drills have been converted from pneumatic operation to hydraulic operation, because of associated gains in efficiency and performance.
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Pioneering Underground Mining - YouTube
3-1-2012 · Joy Mining Machinery releases a new version of its most popular video "Pioneering Underground Mining". It was first produced in 2001 to support a request by …