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Hand-Held Rotary Rock Drill/Jackhammer

 
  
 
HAND-HELD  ROTARY  ROCK DRILL/JACKHAMMER The hand-held pneumatic rock drill/jackhammer (fig. 14-15) is a piston rotary unit that is designed mainly for  use  as  a  hard  rock  drill;  however,  it  is  equally efficient in soft and medium formations. The components of the drill are shown in figure 14-16. The drill consists of a back head group, cylinder unit,  and  front  head  group.  The  back  head  group consists of the four-position throttle, handle, and live air inlet. The cylinder unit consists of a cylinder with a reciprocating  piston.  The  front  head  group  consists  of the chuck, retainer latch, and anvil. The drill design directs air through the drill, down the drill steel, and into the bottom of the hole to blow out rock cuttings. Four classes of rotary rock drills/jackhammers are as  follows: . The first class is a light drill, weighing about 15 pounds. This class is used for drilling shallow holes in quarry operations. l  The  second  class  is  a  light  drill,  weighing  25 to 40 pounds. This class is used for light work, such as potholing and drilling concrete. . The third class weighs from 40 to 50 pounds. This class is used for drilling in limestone and other soft rock. . The fourth class is a hand-held drill, weighing from 50 to 65 pounds. This class is used for drilling holes up to 6 feet during quarry operations. NOTE: All of these drills use hollow drill steel and are  built  with  automatic  rotation. Figure 14-15.—Hand-held rotary rock drill/jackhammer. Figure 14-16.-Components of a hand-held rotary rock drill/jackhammer. 14-12


   


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