COFA has been especially developed for front and back deburring of uneven bore edges. The bore edge is radially and uniformly deburred. The same deburring dimension is achieved regardless of the Z-position of the work piece. The tool concept can be used for soft or well as for hard-to-machine materials. It can be directly applied without requiring any pre-setting. Typical applications include fork components, common rails, castings, pipes with cross-bores and a multitude generall work pieces with cross-bores in main bores. The exchangeable, coated carbide deburring blades guarantee a long service life.

The COFA blade is pivoted in the tool body by a roll pin. Additionally the blade is spring loaded by a bending spring. This enables the blade to trace the uneven bore edge. As penetration of the tool in the bore progresses, the COFA blade tips into the tool body. As a result, the bore edge is radially and uniformly deburred.

The operation is very simple. The tool blade is moved by rapid feed up to a point ahead of the top bore edge. The top bore edge is machined by forward feed with the working RPM. When deburring has been completed, the tool moves through the bore by rapid motion and without stopping the spindle until the blade folds out again at the back of the work piece. Not even reamed bore surfaces will be damaged in the process. The back bore edge is now deburred by backward feed. When back deburring has been completed, the tool moves out of the bore by rapid motion.

1. Tool body
2. Roll pin
3. Bending spring
4. Fixing strip
5. Cap screw
6. COFA blade

The assortment includes tools for applications starting from bore diameter 2 mm up to bore diameter 40mm. Cassettes allow bore diameters of any size to be deburred. The deburring dimension (radial) is 0.1 to 0.7 mm, depending on the tool selected.

Within the tool series, diameter versions are available which cover a minimum bore diameter range. For details, see the technical documentation.