Transactions . controlling curvature. Afterconsiderable expensive experimentation, thecompany has adopted a standard practiceof wedging that appears to overcome one -Rinu Keamcd Off -Deflecting Wedjje D i o .S5 -Pilot Wedge B -Drive Wedge A -Wooden Plug FlO. 1.—Diagram ofing wedges. Trans. Inst. Min. and Met. (1912) 21, Trans. Inst. Min. and Met. (1905) 14, 255. no WEDGING DIAMOND-DRILL HOLES of the large limitations of the diamond drill. Holes that warrant theexpense are wedged back to vertical or back to a straight line as soonas they show deflection of over 3°. A diagram of diverting
Transactions . controlling curvature. Afterconsiderable expensive experimentation, thecompany has adopted a standard practiceof wedging that appears to overcome one -Rinu Keamcd Off -Deflecting Wedjje D i o .S5 -Pilot Wedge B -Drive Wedge A -Wooden Plug FlO. 1.—Diagram ofing wedges. Trans. Inst. Min. and Met. (1912) 21, Trans. Inst. Min. and Met. (1905) 14, 255. no WEDGING DIAMOND-DRILL HOLES of the large limitations of the diamond drill. Holes that warrant theexpense are wedged back to vertical or back to a straight line as soonas they show deflection of over 3°. A diagram of diverting wedges isshown in Fig. 1. Each wedging requires the use of a wooden plug, a drive wedge A, apilot wedge B, a deflecting wedge D, a special clinometer C, Fig. 2, anda special reaming bit E. Wedging is possible in any hole and no changeof size is made, that is an E hole remains E size, an A hole Asize, and a B hole B size. The dimensions and description givenare for A holes. See Detail S Grind oft Sharp Clinometer - C Fig. 2.—Wedges and clinometer for A rods. To wedge a hole at any point, a dry, turned, wooden plug grooved toallow water to pass is pushed down with the rods to the point where it isdesired to branch the hole and allowed to swell. A drive wedge is thendropped into the hole and driven into the wooden plug, using a blank bitfor driving. The drive wedge, being cut out below the face, usuallyfalls with the face of the wedge in the direction of dip but in every caseits position is surveyed carefu41y by using the special clinometer C,Fig. 2. Lines are cut on the inside of the clinometer parallel to and inthe plane of the long axis of the 30° beveled part of the indicating this plane are marked on the sides of a glass test tubewith a small carbon, the low point of the bevel face being indicated. Theglass tube is filled to a height of about 2 in. with hydrofluoric acid dilutedwith two parts of water, a cork put in, gummed paper placed over cor
Size: 2049px × 1219px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
