Drilling cutting fluid is necessary because it provides lubrication and chips out from the hole. No cutting fluid, chips may stick in the hole, and the surface roughness average (ra) could reach double when wet drilling. In this case, the chip can also reduce the amount of fluid torque tool, because the point edges on the drill bit in contact with the hole wall lubricated. Although the coating can also play a similar drill cutting fluid lubrication, coating also reduces cutting forces and make the frictional resistance tends to be minimized. From the general point of view, it is still not completely replace the cutting fluid. Which type of cutting fluid used according to the specific circumstances, cutting fluid lubrication for low-speed machining difficult materials and surface roughness demanding better time. The high cooling capacity cutting fluid, can enhance the performance of high-speed machining cutting materials that can be used when there is a tendency BUE or have strict dimensional tolerances.

But in many cases with the cutting fluid has been some effect, but it requires a high additional costs, it also brings very harmful environmental pollution, it is not worth it. It should be noted that modern cutting tools can withstand higher cutting heat, with the performance of the required high-speed cutting. You can use compressed air to blow away hot chips from the cutting area to replace the cutting fluid when necessary.