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America West Drilling Supply...Where going in the hole makes sense!
 Bulroc CDS 460
Concentric Overburden Drilling System
Drilled Hole Diameter 20.87" -- Casing Size 20" O.D. x 19.02" I.D.
Technical Specifications
The CDS 460 is a Concentric Overburden Drilling System designed for the continuous casing of a 20.87" diameter hole, through loose overburden materials down into solid bedrock. The CDS 460 comprises the Driver, which is available for drilling with 15" hammers, together with a replaceable Pilot Bit and 3 replaceable Segments. The current CDS models now have the option of being supplied with a replaceable Drive Shoulder.
At the start of the drilling operation, the Segments are in the closed position to allow the System to pass through the casing shoe. When drilling commences, the Segments swing out to drill a hole of 20.87". The CDS 460 can be withdrawn through the casing by rotating the System anti-clockwise against the solid base of the hole. If there is no solid base, the System can be closed by pulling up against the casing shoe and rotating anti-clockwise.
Complete System: N125
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Component Parts |
Reference |
Description |
1 |
Driver (N125) |
2 |
Pilot Bit |
3 |
Segments (3) |
4 |
Drive Pins (3) |
5 |
Retaining Pins (2) |
6 |
Retaining Ring Circlips (2) |
7 |
Footvalve (N125) |
8 |
Drive Ring |
9 |
Drive Plate |
Specifications |
| Major Body Diameter |
18.7" |
| Length (less footvalve) |
41.93" |
| System Closed |
17.99" |
| System Open |
20.87 |
| Casing Size |
20" O.D. x 19.02" I.D. |
| Total Weight N125 Shank |
1738 lbs. |
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