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Heule Precision Tool’s COFA tooling enables automated cross hole deburring applications. This specialized technology removes burrs from the front and back of a drilled through hole without stopping or reversing the spindle. Designed for sloped, even or uneven surfaces, the edge break is said to be always even and consistent. COFA speeds production by automating deburring processes of hard-to-reach cross burrs which were formerly deburred manually, including elliptical holes and radiused edge breaks on flat parts. Sizes from 2-30 mm (0.079-1.19") are available. According to Heule, they are well suited for a wide range of applications including forks, yokes, common rails, castings, tubes with cross bores and other workpieces with cross bores in their main bores.

Controlled by a simple spring, the carbide cutting blade follows the contour of the hole’s surface, removing all burrs while creating an even tapered corner break. The blade does not cut as it passes through the bore and will not damage the hole’s surface. The edge break begins only at the point where the blade contacts the material and then tapers the hole’s edge. This allows for faster feed rates since the tool slows itself down as it enters the through hole. The simple concept of the COFA tool has no adjusting screws or presetting requirements. Available in common tool size and spring strengths for various materials and hole sizes.

A wide range of COFA tooling is available, including COFA C for threaded holes and COFA Cassette for deburring larger bores quickly and efficiently.