Symmetric Casing Systems with Ring Bit

1.In not stable rock formation, the casing is necessary to follow.

2.Usually in foundation or water well drilling, for large hole boring.

3.drilling depth is better less than 40 metres to control the hole well. larger depth is also available with other designs.

4.match to 12″ hammer and 406mm casing tube.

5. air pressure is 25 Bar and air volumn is 1500 cfm.

6. the ring bit is left in the hole.

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Adavantage

1. the concentric design is more reliable and less torque than the eccentric.

2. large impact power to make high speed drilling.

3. straighter hole.

4. easy to follow the casing.

5. reverse rotation and withdraw the pilot bit to use it for next holes.