On December 5, 2007, Hitachi Tools launched the "Epoch Micro Step Borer," a specialized drill bit designed for micro-hole machining (see Figure 1). This innovative tool is capable of creating holes with an aspect ratio (L/D) of up to 100, making it ideal for precision applications such as fuel nozzles in automotive engines, air vents in molds, and intricate components in electronic devices. One of the key design features of the Epoch Micro Step Borer is its short cutting edge length—approximately five times the tool diameter. This design is optimized for step-by-step drilling, allowing for greater control and accuracy in deep hole machining. Additionally, the tool incorporates a reinforced non-cutting section, or neck, which enhances overall rigidity and reduces deflection during operation. However, reducing the groove length can lead to chip accumulation on the neck, increasing the risk of welding and tool damage. To address this issue, Hitachi Tools introduced a "chip stopper" between the cutting edge and the neck (as shown in Figure 2). The chip stopper has a diameter nearly equal to the tool’s outer diameter, ensuring that chips are effectively contained and prevented from reaching the thinner neck area. The blade tapers from the tip toward the neck, then expands slightly before the stopper, maintaining structural integrity while improving chip evacuation efficiency. This design not only improves performance but also extends tool life in demanding micro-drilling applications.

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