1. When producing in soft rock with good drillability, the drilling speed is faster, and a large amount of slag discharge and high-quality slag discharge must be selected, and the shape of the four wings is preferably selected.
2. When producing in hard rock, due to the high strength of the rock, each column tooth and drill bit need to bear a large amount of load. Therefore, it is necessary to choose a bit with a higher strength bit body and column teeth.

3. When drilling rocks with clay, the slag hole often looks clogged due to the loosening of the clay, and side slag drill bits can be selected.
4. The toughness is better when drilling in the rock, you can choose the toothed bit to ensure safe production.
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Lu ICP 19020630 -1 
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