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German tooling manufacturer, Horn, has introduced two grooving systems for internal machining of bores. System 209 is intended for bores of diameter 16 mm and above, while system 216 machines bores greater than or equal to 20 mm diameter.

Both systems utilise toolholders with internal cooling. A robust shank with elliptical cross-section of the boring bar neck ensures excellent damping properties. The ground shanks, of g6 quality, are available in left-hand or right-hand design.

Coolant flows from a nozzle in the clamping finger and from the side of the tool holder. The two jets cool the cutting zone effectively and remove chips from the inside of the workpiece in a controlled, efficient manner. 

Precision-sintered, indexable, two-edged inserts with cutting widths from 2 to 6 mm are available in geometries .5, .1A and .KF for cutting medium strength materials. All three geometries offer good chip control and targeted chip breaking, even on long-chipping materials.

The 209 system toolholders with a shank diameter of 16 mm allow retraction distances of up to 30 mm in conjunction with a grooving depth of 3.5 mm. For bores with a diameter of 18 mm or above, a more stable shank diameter of 20 mm, also with a retraction distance of 30 mm, can be used to achieve a grooving depth of 5 mm. The 216 system toolholders, with a shank diameter of 20 or 25 mm, enable grooving depths down to 7 mm at a projection length of 2 x D.

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