Technical Information Setup Recommendations Setup Recommendations for Bar Overhang WIDIA-CIRCLE™ cutting tools are the finest quality boring, grooving, profiling, and threading tools available. For more than 50 years, WIDIA-CIRCLE has been the industry leader in solving small-diameter hole machining problems in major manufacturing plants worldwide. A common problem associated with any cutting tool is extending the tool beyond its support point. This condition of excessive overhang can cause chatter, poor finishes, or inadequate tool life. Toolholder Overhang We recommend a 4:1 ratio (4 times bar diameter) overhang when using steel shank bars and up to a 10:1 (10 times bar diameter) overhang when using carbide shank bars. The overhang ratios steel shank carbide shank are affected by many factors: shank diameter ratio 4:1 ratio 10:1 (mm) (mm) (mm) • Type(s) of material(s) being machined. • Depth of cut(s). 4,00mm 16,00mm 40,00mm • Feed rate(s). 5,00mm 20,00mm 50,00mm Recommended conditions may still be unsatisfactory because 6,00mm 24,00mm 60,00mm of chatter. Chatter can be induced by non-rigid setups or harmonics from the machine or machining conditions. In many 8,00mm 32,00mm 80,00mm cases, changing the RPM of the machine can reduce chatter. 10,00mm 40,00mm 100,00mm 12,00mm 48,00mm 120,00mm 16,00mm 64,00mm 160,00mm 20,00mm 80,00mm 200,00mm 25,00mm 100,00mm 250,00mm 32,00mm 128,00mm 320,00mm D86 widia.com