Odex-146 eccentric overburden drilling pilot bit for 5 inch dhd350 QL50 MISSION 50 DTH hammer

  • Brief info:Odex-146 Eccentric Overburden Drilling Pilot Bit For 5 Inch Dhd350 Ql50 Mission 50 Dth Hammer , Find Complete Details about Odex-146 Eccentric Overburden Drilling Pilot Bit For 5 Inch Dhd350 Ql50 Mission 50 Dth Hammer,Odex-146 Pilot Bit,Eccentric Overburd
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Working principle

1: When drilling starts,the reamer swings out and reams the pilot-hole wide enough for the casing tube to slide down behind the drill bit assembly.


2:When the required depth is reached, rotation is reversed caerfully,whereupon the reamer swings in, allowing the drill bit assembly to be pulled up through the casing.

3:Casing tubes that are to be left in the drill hole should be sealed at the botton of the hole by means of cement grout or some other sealing agent.

4:Drilling continues to the desired depth in the bedrock using a conventional drilling.
Product Parameters
Outer Dia.(mm)
Inner Dia.(mm)
The Max.Wall Thickness
Reamed Dia.(mm)
178
158
10
195
Inner Dia.of Casing Shoe That Pilot Bit Can Pass Through
Inner Dia.of Casing shoe
(mm)
Hammer Type
Drill Pipe (mm)
146
148
DHD350   QL50 MISSION50
76/89
Product Details Show
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Our hammer and bits are made of high quality alloy steel with advanced heat treatment to assure the good drilling performance and long service life. They are widely used by our customers all over the world.

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