How to sharpen a diamond core drill bit?

Diamond core bits must maintain good diamond exposure in order to work efficiently. Many factors work in unison to provide the controlled erosion cycle of the bit's segments. When this controlled erosion cycle is altered, the bit can become dull or glazed. Glazing becomes noticeable when the coring feed rate slows dramatically or the bit does not cut. Examine the bit immediately. If the diamonds are flush with the metal, they are underexposed or glazed. The following steps will often correct this problem:

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1. Reduce water flow until it becomes very muddy. Continue using as little water as possible until penetration increases.
2. If bit does not open up, remove from hole. Pour into kerf a thick (1/4") layer of silica sand, the coarser the better.
3. Resume coring for approximately 3 to 5 minutes with very little water and at a lower RPM if possible.
4. Gradually increase water flow to flush sand from kerf.
5. Repeat as needed.

Our diamond core bits are designed to be self-sharpening and will stay sharp throughout the drilling process. As the diamonds in the cutting teeth become dull, they are worn away and new diamonds are revealed. However, if you find that your bit is not cutting as it should, the cutting face may have become glazed or polished. This will be evident upon inspection as the teeth of the bit will look shiny or glassy.

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In order to continue drilling, you will need to strip away the surface of the cutting face. Here are a few easy ways you can do this.

1. Temporarily reduce water flow as you drill. Apply pressure to the bit until you can feel it begin to cut. Restore water flow and continue drilling
2. If the problem persists, remove the bit from the hole and pour in a thin layer of course silica sand. Resume drilling with reduced water flow and reduced speed. Gradually increase the water flow to flush the remaining sand.
3. If the bit still won&#;t cut, try removing the bit from the hole and drilling several holes into a concrete cinder block with reduced water flow.
4. Repeat any steps as needed.

This process can be tricky for new users but your core bit should be usable until the cutting segments are all but completely worn away. 

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