FIELD: drilling of directional holes in coal industry, for instance, of degassing and pilot holes, and holes for relieving stresses in coal seams or some other production slim holes in mines of gas outburst category. SUBSTANCE: deflecting radial force is produced due to use of centrifugal unbalanced mass of drill tool with drill bits different in heights. Hole path is controlled by varying the value and point of application of deflecting radial force due to variation of value of angular velocity of spindle rotation during one revolution. EFFECT: higher efficiency. 4 dwg
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Authors
Dates
1997-08-27—Published
1994-07-25—Filed