
WIDIA-CIRCLE™ cutting tools are the fi nest quality boring, grooving, profi ling, 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 Toolholder chatter, poor fi nishes, or inadequate tool life.
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)
4,00mm 16,00mm 40,00mm
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 |