Figure 14-5.—Using auger controls for positioning of auger.Figure 14-6.-Continuous-flight auger.and to clear the bit of cuttings. Remember, as the augeris raised, push the hand throttle forward to lower theengine speed. Repeat these procedures until the holebeing drilled reaches the desired depth.AUGERSEarth augers may use continuous-flight augers(fig. 14-6) or single-flight augers (fig. 14-7).The auger head is attached to the drill shank by asquare-drive pin connector. Continuous-flight augersusually come in sizes from 5 to 12 inches in diameterand various lengths. A 5-inch auger can drill about 100Figure 14-7.-Single-flight auger.feet in suitable material; a 10-inch auger is limited toabout 40 feet.Single-flight augers, lifted after every 8 to 10 inchesof penetration to clear the cuttings, measure from 14 to36 inches in diameter. Single-flight augers are limitedto depths of about 15 feet.14-6
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