SWDM40 OPERATION & MAINTENANCE MANUAL
Refer to below table to select.
Rock quality designation is the ratio of the accumulated length of columnar core which greater
than 10cm per run to footage per drilling return (shown in percentage).
1. For rock uniaxial compressive capacity more than 70Mpa and RQD value more than 60%,
cone teeth cylinder drilling core should be used.
2. When cutter teeth cylinder is used to drill at speed lowering than 15cm/hour, besides,
machine vibration is very large, and the cutter teeth is consumed obviously, thus, the cone teeth
cylinder drilling core should be used.
3. When cutter teeth cylinder is used to drill at speed lowering than 15cm/hour, besides,
machine vibration is very large, and the cutter teeth is consumed obviously, thus, the cone teeth
cylinder drilling core should be used.
Uniaxial compressive strength
Rock compressive strength
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