Carbide Bit Basics

Manufacturing electric file bits with tungsten carbide creates long-lasting and extra-durable bits.

As a follow-up to our story on Kupa’s electric files (July 2000, p.24), we asked Richard Hurter, marketing director for electric file manufacturer Kupa, to tell us more about the bits they produce on-site at their Buena Park, Calif., facility. Namely, what makes carbide bits so special?


“Carbide bits have little blades (like microscopic razor blades) that cut at an angle. Unlike bits with a sandpaper-like surface that grind, carbide bits actually shave the acrylic, which means less pressure is required. This results in less dust, and since there’s less friction, there’s less heat,” he explains.


“Since tungsten carbide is one of the hardest materials available, the bits last a long time, and if the shaft is carbide, they won’t bend or got out of round if you drop them.” The other key to Kupa’s bits, says Hurter, is that the head and the shaft are ground concentric to one another, so when placed in the electric file, there is no “out of round” vibration, which is easier on the tech, as well as the client.


See also The Making of an Electric File , NAILS Magazine, July, 2000.

Originally published in NAILS Magazine October, 2000.

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