Why DC426 shows up in inspection failures

The DC426 series black-coated solid carbide drill is designed for high-precision micro drilling in challenging materials such as steel, stainless steel, copper, and aluminium alloys.

Series Overview and Key Features

The DC426 series is a grinding series that offers a wide diameter range from 0.04 mm to 3.0 mm, with a minimum diameter capability of 0.10 mm. This makes it ideal for micro drilling applications where tight tolerances and high surface finish are required. The black coating on the DC426 series enhances wear resistance and reduces friction during machining, which is critical for maintaining tool life and cutting performance. The series includes part numbers such as DC426-1000-04, DC426-0500-04, and DC426-0800-04, all of which are suitable for general micro drilling tasks.

The geometry callout "D1.0073*38" provides insight into the tool's design, where D1.00 refers to the diameter, 7 is the flute length, 3 is the helix angle, and 38 is the shank length. This combination ensures efficient chip evacuation and optimal cutting performance.

Measured Variables and Their Impact on Machining

When diagnosing issues with the DC426 series, the first measured variable to check is the diameter of the drill bit. For example, the DC426-1000-04 has a diameter of 0.10 mm, which is the minimum capability of the series. If the actual diameter deviates from the specified value, it can lead to inconsistent hole sizes and poor surface finish.

Another critical measurement is the helix angle, which is specified as 3 in the geometry callout. The helix angle affects chip evacuation and cutting forces. A helix angle of 3 degrees is suitable for micro drilling in materials like stainless steel and aluminium alloys, as it provides a balance between chip removal efficiency and tool stability.

Variables to Hold Constant for Consistent Performance

To ensure consistent performance, the flute length and shank length should be held constant. The flute length of 7 mm is essential for effective chip evacuation, especially in micro drilling where chip accumulation can lead to tool breakage. The shank length of 38 mm ensures secure tool holding and reduces the risk of deflection during machining.

By maintaining these variables constant, operators can achieve reliable results and minimize the risk of tool failure or dimensional inaccuracies. The DC426 series is a reliable choice for micro drilling applications, provided that the key measurements are monitored and controlled.

Verified production record

Figures above are transcribed from the production order record and the printed catalogue extracts. Confirm the held tolerance for a specific part number in the written quotation.

See the recorded geometry on the DC426 page of this catalogue.