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Instructions for using down the hole drill bit
2024-09-03In order to use the down the hole drill bit correctly and ensure the drilling accuracy and service life of the drill bit, the following points should be noted:
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How to determine rock grade==strength
2024-09-03Strong, dense, and resilient quartzite, basalt, and various other particularly strong rocks. (f=20) II. Very strong granite, quartz porphyry, siliceous schist, relatively strong quartzite, strong sandstone, and limestone (f=15) Strong and dense granite, strong sandstone and limestone, quartz veins, strong conglomerate, and strong iron ore (f=10) IIIa Strong and sturdy sandstone, limestone, marb
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