Tube Sizes
There are five major "wire line" tube sizes typically used. Larger tubes produced larger diameter rock cores and require more drill power to drive them. The choice of tube size is a trade-off between the rock core diameter desired and the depth that can be drilled with a particular drilling rig motor.
Standard "Q" wire line bit sizes
| Size | Hole (outside) diameter, mm |
Core (inside) diameter, mm |
|---|---|---|
| AQ | 48 | 27 |
| BQ | 60 | 36.5 |
| NQ | 75.7 | 47.6 |
| HQ | 96 | 63.5 |
| PQ | 122.6 | 85 |
| CHD 76 | 75.7 | 43.5 |
| CHD 101 | 101.3 | 63.5 |
| CHD 134 | 134.0 | 85.0 |
Read more about this topic: Exploration Diamond Drilling
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