Overburden drilling

 

 

Overburden drilling style: ODEX-eccentric, Symmetrix-concentric

Overburden drilling hole Diameter:ODEX-eccentric: 114-324mm

                                                 Symmetrix-concentric:  114-610mm
              

 Features:
 

  • Pilot bit is well designed to offer good drilling efficiency.
  • Optimization design for each part reduces the probability of accident.
  • Strengthening quality of stable pole driller extends the drilling life and improve cost-4、performance ratio.

 

 

 Overburden drilling working Principle 
ODEX-eccentric

Symmetrix-concentric