Mining Engineers' Handbook, Volume 2Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 15-33
... drill for given service depends on character of the rock , depth of holes , air press available and other factors ... drill , or smaller Light wagon - drill , feed 6 ft or less With 3 1 / 2 - in drill WAGON- MOUNTED DRILLS Classified ...
... drill for given service depends on character of the rock , depth of holes , air press available and other factors ... drill , or smaller Light wagon - drill , feed 6 ft or less With 3 1 / 2 - in drill WAGON- MOUNTED DRILLS Classified ...
Halaman 15-35
... Drill feeds . HAND - FEED for drifters consists of a long screw turned by a crank engag- ing a nut attached to the drill head . One type of AUTOMATIC FEED uses a ratchet device , which turns the feed screw by the drill's vibration ...
... Drill feeds . HAND - FEED for drifters consists of a long screw turned by a crank engag- ing a nut attached to the drill head . One type of AUTOMATIC FEED uses a ratchet device , which turns the feed screw by the drill's vibration ...
Halaman 15-38
... drill ; all drilling operations being intermittent . In soft rock , where the actual time of drilling is short , more drills can be run with a compressor of given size than when working in hard rock , where the drills work continuously ...
... drill ; all drilling operations being intermittent . In soft rock , where the actual time of drilling is short , more drills can be run with a compressor of given size than when working in hard rock , where the drills work continuously ...
Isi
COMPRESSED | 15 |
Applications Definitions Data | 15-44 |
Accident Compensation Pensions | 16-1 |
Hak Cipta | |
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adjustment Aerial Tramway anthracite approx assay aver borax buckets Bur Mines capac carriers cars charge chute claim coal mines compressor concentrate conveyer copper cost crusher crushing cu ft cupel cyanide deflection diam discharge distance drill dust elev engineer explosions feed filter fire firedamp gold hoisting horiz intercooler labor lamp less litharge loaders loading lode long ton machine material mechanical metal method mill mineral motor operation pipe plant plate plumb-bob pump pyrite rock safety lamps sample screen shaft sheave short ton side silver sizes Sodium carbonate solution speed station steel stopes surface survey Table tape telescope temp tension tests timber tion tons Total towers track cable traction rope tramway Trans transit traverse underground usually vein vertical wire zinc