![]() Machine tools must also deliver sufficient coolant pressure. One non-negotiable factor is the use of through-coolant drills. Although tools may wear more quickly and parameters may need to be less aggressive than with a water-based coolant, an insert coating that improves heat resistance might help compensate. That said, semi-synthetic or fully oil-based formulations can be a better choice to improve lubricity and ensure short, segmented chips in certain cases. Water-soluble coolants are most common for general-purpose applications because they remove heat well. “One of the most underestimated inputs in any machining process, even beyond drilling, is the coolant.” As a result, dialing out runout no longer requires dismantling and cleaning the tool assembly, adjusting offsets, adding shims to tool turrets, or relying on experienced machinists to attempt an unorthodox solution. This drill features an adjustable pin that moves the insert radially to mitigate the tolerance stack-up common to all replaceable-tip drills. In this case, the Stealth Drill itself adds to the time-savings provided by offline presetting. “A presetter is probably 5% of the cost of those lost hours,” Mr. In a 24/7 production environment, that adds up to nearly 2,200 hours per year (a figure that does not account for machine downtime during tool changes). In contrast, setting up three tools on the machining line could take as long as 30 minutes, amounting to 90 minutes of lost time over the course of three shifts. ![]() ![]() At one customer’s facility, three of Allied Machine’s replaceable-tip, self-guided “Stealth” drills (so named for their quiet operation) are set up in the toolroom at the beginning of each shift. ![]()
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