Arlon®, a crystalline, high-temperature engineering thermoplastic, is suitable for processing by extrusion or injection molding using conventional equipment. However, shaping of molded articles or extruded bar is also possible using the same equipment and techniques normally used for machining mild steel. Equipment parameters for several typical machining operations appear below.
Guidelines for Machining Unfilled and Glass-Filled Arlon
Unfilled grades of Arlon require standard milling cutters. Cutter speeds of 250 – 350 ft/min. (7620-10668 cm/min) can be used with filled Arlon. Speeds of 500 – 750 ft/min. (15240-22860 cm/min) can be used with unfilled Arlon with plain water coolant for milling holes or deep pockets. Carbide-tipped tools are recom-mended for the milling of glass-filled grades.
Use spiral flute machine reamers where possible at speeds of 100 –200 rpm for unfilled and glass-filled Arlon. Greene, Tweed advises using a water coolant. Arlon can be very abrasive to high-speed drills particularly when glass-filled grades are being machined. To mini-mize tool wear, use carbide-tipped tools. Work sharp corners with care to avoid the possibility of chipping. Although Arlon is impervious to most coolants and oils, the use of these should still be restricted by nature of the final application products.