Page 176 - Failure Analysis Case Studies II
P. 176
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BLOOIE ASSY.
AIR WATER INLE
DISCHARGE
SLOPE DRILLING
HEX STABILIZER
BIT REAMER
STABILIZER
TRI-CONE BIT-
Fig. 2. Slope drilling of a pilot hole.
RIBBED STABILIZER(S)
ROCK CUTTERS
RAISE BORING
Fig. 3. Raise boring head and rock cutters.
