Diamond drill bit in drilling hard rock, often appear the case that the diamond is worn flat or can not expose due to the hardness of the body is not appropriate, at this time, the drill is neither drilling footage nor wear, this phenomenon becomes "slip" or "can not be self sharpened". This situation can be dealt with in the following ways:
1. Increasing the bit weight and force the bit to drill footage, the diamond is exposed and the weight on bit is restored immediately after it is normal.
2. Reducing the amount of pump and using the residual rock powder in the hole to accelerate the wear of the carcass, so that the diamond expose.
3. If necessary, add some rock powder to the washing fluid to increase the friction between the drill bit and the bottom of the hole and promote the diamond expose.
4. If the above methods are ineffective, other suitable diamond bits may be considered.
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