5.5 

 5 



4.5 

 4 



3.5 



impa6.dat 



3 - 



2.5 



2 - 



1.5 - 



1 - 



0.5 



- 































Ill 



h. 



Jl 



i; 



n 



^ 



tx Ai 



L 



h 





L 



,* . 



h, 



ill. 



0.05 0.1 0.15 0.2 0.25 0.3 0.35 



Time (sec) 



(a) Test A6 impact energy; 1,350 psi, redesigned plunger and piston. 



0.12 



0.1 



bf za6. dat 



o 0.08 

 s 



L t 0.06 



i 



° 0.04 

 n 



< 0.02 





 -0.02 

 -0.04 



0.05 0.1 0.15 0.2 0.25 0.3 0.35 



Time (sec) 



(b) Test A6 body motion; 1,350 psi, redesigned plunger and piston. 



Figure 10 

 Drill body displacement and impact energy for second mode operation. 



22 



