One of the biggest challenges in internal turning is long chips. Bore machining often leads to long chips, depending on the material. They wrap around the tool, clog holes, or in the worst case, lead to tool breakage. Paul Horn GmbH has succeeded in developing a universal boring tool with sintered chip shape geometry using the Supermini type 105. The tool offers high process reliability in operation due to good chip control. At the INTEC 2025 trade fair, Horn will complete the tool family with two additional sizes. For internal turning, the tool manufacturer now offers cutting inserts for the diameters to be machined starting from 4 mm, 5 mm, and 6 mm. The cutting edge geometry extends deep into the corner radius of the cutting insert. This ensures chip control even with small feed rates. The geometry can be universally applied to various material groups and is suitable for internal, flat, copy, and backward turning.
In addition to the geometry, Horn also optimized the blank of the cutting insert with higher stiffness and an even more stable cutting area. Furthermore, the designers revised the cooling supply. The cutting inserts are compatible with numerous clamping holders of type 105. Horn offers the tools in three overhang lengths (15.0 mm, 20.0 mm, and 25.0 mm) and in grades TH35 and IG35 as standard.
For the variant starting from 4 mm, lengths of 15 mm and 20 mm are available. The corner radius is 0.2 mm. The broad application area of the cutting inserts is also reflected in their cost-effectiveness. Compared to laser-cut geometries, the costs of the new Supermini are in a similar range as the standard cutting insert without geometry.
For the clamping holders, the user can choose the appropriate solution for their machining from a variety of different variants. These include round shank holders, square holders, interface clamping holders, and adjustable clamping holders for different machine manufacturers. For clamping the cutting insert, Horn offers four different solutions. The classic screw clamping via a ball pressure screw, clamping via a face clamping element, and clamping via a lifting element. For tight conditions, Horn also offers a slim clamping system with clamping via a nut.
Boring, profile turning, internal grooving, thread turning, chamfering, axial turning, drilling, and slotting. The Supermini tool system can be adapted and used for numerous machining operations. The solid carbide cutting insert is used in bore machining from a diameter of 0.2 mm to around 10 mm. Horn developed the blank of the tool in a droplet shape. This shape allows for precise and large contact surfaces in the tool holder, resulting in higher stiffness of the overall system. Furthermore, the droplet shape prevents the cutting insert from twisting, which leads to a consistently precise position of the tool tip height. In the case of long tool overhangs, it reduces deflections and minimizes vibrations during the turning process. Depending on the application and the diameter to be machined, Horn offers the cutting insert in three different sizes (types 105, 109, and 110) and various blank types. All variants allow for internal coolant supply directly to the working area. The Horn tool portfolio includes around 2,500 different standard variants of the Supermini. In addition, Horn has solved users' tasks with countless special solutions.
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