b'The T-A Pro drilling system achieves terrific tool life at high penetration rates, especiallyin situations in which the balance of chip formation at high penetration is critical.This replaceable insert drill offers ISO-specific geometries to simplify insert choices.High-Speed Holemaking spindle coolant invariably is pre- MQL delivers a precise amount of ferred, generally at 450 to 800 psi. aerosol coolant that is directed by The latest advance in coolantthe machine program in line with tool life by 10% to 20%. involves minimum quantity lubrica- the cutting operation. MQL not Coolant pressure and applicationtion, he said, which is becomingonly reduces coolant cost but is a are further considerations in reduc- increasingly popular. Simply stated,cleaner and safer process.ing heat, increasing lubricity and fa-cilitating chip removal in high-pro-duction drilling.A key element in coolant is the flow rate, Hobbs said. The correctGundrill the extreme.flow rate does a much better job of chip evacuation than high-pres- Win the work.sure coolant. Flooding is all right for shorter holes, but high pressure can restrict the flow rate and reduce flow and chip evacuation. With re-gard to coolant composition, we recommend a higher-viscosity oil-based compound for high-speed applications. It not only acts as coolant but improves lubricity. Wa-ter-soluble and synthetic or semi-synthetic coolants can create fric-tion, resulting in poor hole quality.Pilger said coolant always is rec-ommended for improving carbide holemaking tool life, but coolant through the spindle is absolutely the best practice when drilling with carbide.Through-the-spindle coolant AUTOMATED HIGH-PRECISION GUNDRILLING delivers coolant directly to work- FOR THE MEDICAL INDUSTRY.ing cutting edges, as well as flush-ing enhancing chip evacuation, heSmall diameters. Tight tolerances. Thin walls. Make easy work of the most said. Although both oil- and wa- challenging surgical instruments with the automation-ready UNE6-2i ter-based coolants will work in gen- from UNISIG. Performance-enhancing features, including specialized eral applications, selecting the rightworkholding, high-speed spindles and more, ensure speed and precision coolant is most important in finish- when it matters most.ing operations, such as reaming,Visit us at IMTS in booth #339159 to discuss where we recommend an oil base.automating your gundrilling processes.Under normal conditions, applica-tions involving holemaking in three times the diameter can be effec-tively accomplished with flood cool-ant. But depending on the mate-rial being drilled, operations at fiveVisit UNISIG.COM/MEDICALtimes the diameter or greater de- [email protected] | (262) 252-5151 for more informationmand coolant through the spindle.Ruegseggersaidthrough- ctemag.com/cteguide.com25Holemaking.indd 25 8/16/22 11:49 AM'