DRILLING

a. Slant drilling
 
Description:

PROHIBITED do the drilling Miring parallel to Bench on position Crest.This case resulted in rod drill a brokenand eyes of drill quickly aus







 
 
 
 
 
 
 
 
 b. The slope of the maximal The position of Miring who allowable
 
Description:
Maximum slope of a drill when drilling is 20o. If drilling is not accurate then it could menyembabkan quickly broken drill stem.


 

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