i am conducting experiment for different depth of drilling condition for rocks, as keep on increasing the depth, the specific energy goes on increasing, where as in cutting operation specific energy decreasing with increasing in depth of cut. what is the major difference between them.
The major difference is the content of the rock. Usually content differ and debris when you go deeper will dominate since friction will increase and thus heat will follow. Try to do peck drilling. Or if you are using CNC try to dwell during your operation.
As the depth increases in rock drilling, the specific energy increase because the friction is higher. A good option is to use peck drilling.
I think that the dweel is not good because you wear the drill, without make a useful work.
The deell depend on the hardness of the rock. You can optimize your dwell base on tool hardness and rock materials hardness to prevent wear. I think very small dwelling time if you are using computer aided program around 0.2 sec is useful. Again depend on the hardness of your tool.
Thank you very much for your useful suggestions and informations.
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