Brocciatore Rotativo Poligonale per Tornio e Fresa Parte 2/3 #206

Manufacturing a polygonal rotary broaching tool for internal broaching. The broaching tool consists of three parts: the broaching body, shank, and broach holder. The broach is made of carbon steel. Presentation The polygonal rotary broaching tool is a machining system that allows for the production of non-circular internal or external shapes—such as hexagons, squares, Torx bits, or special shapes—directly on conventional machine tools such as lathes and milling machines, without the need for dedicated broaching machines. Operating Principle The tool (rotary broach) is mounted inside a tool holder that allows for an angular inclination of approximately 1.25° with respect to the rotation axis of the workpiece. During machining, the slight inclination causes the tool profile to "oscillate," describing a movement that allows the profile to progressively penetrate the material. Only a small portion of the tool profile is in contact with the workpiece at any given time, allowing for a controlled cut. Technical Considerations The tool relief angle must be greater than or equal to the broaching tool's tilt angle to avoid rubbing. Best results are achieved with short-chipping materials. Lubrication and centering are critical to tool quality and life. MAIN COMPONENTS OF THE POLYGONAL ROTARY BROACHING TOOL Tool holder body - This is the tool's outer casing, containing all the mechanical components and the tilting system. It attaches directly to the lathe or milling machine's tailstock. Tilted head - This is the part that rotates freely and supports the actual tool (the broach). It is tilted at 1.25° from the body axis; this tilt creates the orbital motion necessary to shape the polygonal hole. Broach holder - This is a seat inside the tilted head where the broach is housed. It ensures correct positioning, locking, and centering of the tool. Download the drawings here: https://drive.google.com/drive/folder...