What's the Diamond Core Drill Bit Drilling Tips and Techniques?
What's the Diamond Core Drill Bit Drilling Tips and Techniques?
How to make diamond core drill bit?






Drill Bit | Rating |
Lubrication Method | (1 poor - 10 good) |
Squirt Bottle | 2 |
Hose | 3 |
Clay Dam | 4 |
Under Water | 4 |
Squirt Bottle w/pumping action | 6 |
Clay Dam w/pumping action | 10 |
Under Water w/pumping action | 10 |
Water Feed | 10 |
Hose or Water Drip Method: The most basic method is to use a small hose that runs water onto the surface near the hole and down into the bore hole. To provide lubrication on a horizontal surface, one trick is to place a plastic jug or bottle with a small hole near the bottom of it, next to the drill hole. The water leaks out of the bottle and provides continuous lubrication as you drill. To allow lubrication to reach the drill tip, it is very important to use a "pumping" technique described below. Without the pumping technique, the water will not reach the very tip of the drill bit.
Clay Dam: Another excellent lubrication technique is to build a "dam" around the drill hole using a small amount of modeling clay or a similar material. This method can be very effective, especially if the water extends above the side tip lubrication hole to allow water to flow into the bit providing good interior lubrication. "Pumping" the drill is also very important to increase the lubrication at the tip. Without the pumping technique, the water will not reach the very tip of the drill bit. The clay can be used many times if it is stored in a plastic zip-lock style bag to keep it from drying out.
Pan Drilling: For low volume repetitive work, it is also possible to place the material into a pan or plastic tub (place a thin plastic board underneath so you don't drill into the pan) and fill the pan with water so that it covers the surface of the material being drilled. The water should cover the side lubrication hole on the tip of the diamond drill bit. To allow lubrication to reach the drill tip, it is very important to use a "pumping" technique described below. Without the pumping technique, the water will not reach the very tip of the drill bit even though the bit is under water.
Spray Bottle: When drilling on vertical surfaces, about the only way to apply water is to use some type of hose. If that is not possible, a marginally effective solution is to have someone constantly "squirting" water into the bore hole using a squirt bottle. Squirting water will usually keep the bit from burning up, but unless a pumping action is used, the water will not reach the very tip of the drill.
Pumping Technique: No matter what lubrication method is used, a periodic "pumping" action will significantly improve lubrication at the drill tip. Because of the pressure on the drill tip, water has trouble reaching the very tip of the drill bit. A "pumping" technique allows lubrication to reach the very tip. While drilling, merely raise the drill up and down a fraction of an inch once in a while as you drill (maybe every 15 to 20 seconds or so). This assures that water enters the drill tip area completely and fully lubricates the very tip. Pumping the drill improves lubrication at the tip and will improve drill bit life considerably.
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