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These drills require moderate operating pressure, and a low spindle speed. You can use oil as a lubricant and coolant. Using these drills in a hand drill may be un-avoidable in some situations but stationary equipment is always preferred for carbide tipped tooling. Unfortunately, there is no easy way to tell one metal type from another just by looking. Hardened steel is always significantly harder than other steels. It is resistant to filing, which means a file will take off much less material from hardened steel than regular steel. It is difficult for even a trained, experienced craftsman to differentiate between steel types. We use a combination of 60 years of experience and a process of elimination to determine if the drills for hardened steel are needed. Sheet steel is almost never hardened (safes being an exception). Bar stock is also almost never hardened. Bolts, screws, freeze plugs, bearing races, safes, shafts, gears, and industrial machinery parts are examples of hardened tooling. These drills are most often used as a last resort, for removing other broken tooling from the boring site, or if other high quality drills have failed to effectively drill a given material. If you have any further questions, please feel free to contact us.
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