MATERIALS DRILLED You can successfully diamond drill most hard, brittle material such as glass, quartz, granite, ceramics, hard fired metallic oxide, carbide, etc. Plastics and softer tenacious materials are not usually drilled with success. If in doubt about the material you propose to drill, we will gladly run a test on it and report the results
	MACHINE REQUIREMENTS Machines capable of developing the proper speed and which have a sensitive feed can be used for diamond drilling. Provisions must be made for securely holding and positioning the piece to be drilled. The spindle bearing must be in good condition and the feed sensitive so the operator can “feel” the cut. When using CNC equipment, it is advisable to “back off” to slower speed and feed rates, and then gradually increase them until optimum results are obtained. Programs and record keeping become as important as operator experience. DRILL SPEEDS Optimum drill speeds will vary from 100 to 500 surface feet per minute depending on the coolant and the material drilled. At slower speeds the drill will cut more freely. Insufficient speed will shorten the drill life. The drill should be run as fast as it will cut freely. Click here to see graph. COOLANT Diamond core drills must have a constant flow of coolant through the center, across the end, and out around the outside to cut freely. Any interruption of this flow will instantly cause the cuttings to build up in the cutting area causing overheating, probable damage to the drill and to the material being drilled. To maintain this coolant flow a pressure ranging from 40 PSI for the larger drills to 400 PSI for the .030” OD drills is essential. Most core drilling problems can be traced to insufficient coolant pressure. An ordinary coolant pump will provide ample volume BUT CANNOT SUCCESSFULLY BE USED for core drilling – the pressure is insufficient. A water-soluble oil or synthetic grinding fluid, mixed at about 35 to 1, is recommended. GENERAL Diamond core drills manufactured for the drilling of specific materials cut freely and rapidly. Do not try to force the drill with excessive pressure. Check for adequate coolant supply and proper speed. Dress the drill by drilling into an abrasive stick if necessary. Be sure the core is removed from the drill after each hole. Coolant pressure will force it out if the feed is stopped as soon as the drill is through the work piece. Feeding beyond this point will wedge the core into the drill, which then has to be removed, and the core pushed out. Any core jammed or caught in the drill should be removed by pushing the core back through the tubing and adaptor. Forcing the core through the diamond section could result in a damaged or broken drill. We would be happy to answer additional questions. Please click our contact page.

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