Odex-178-146 eccentric overburden drilling pilot bit for 5inch dhd350 DTH hammer

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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
76/89
Product Details Show
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About us

.WORLDRILL® DTH drilling tools including DTH hammers and bits are widely used in a variety of application formations in more than 50 countries in the world.

Equipment & technology

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.

Service

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            --- Alexander from South Africa
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Product Processing
FAQ

Q1: Can I have a sample for testing?
A:Samples are still to be paid but discounted price can be provided.

Q2: Do you have the inspection procedures?
A:100% strict inspection and testing for every order before packing.

Q3: How can i get the after sale services?
A:Free replacement will provide once the problems casued by our product quality.

Q4: Can I have a visit to your factory before the order?
A: Sure, welcome.

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Contact

For drilling solutions or custom manufacture, please contact WORLDRILL now to find out what more we can do for you: