Setup Recommendations for Bar Overhang

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 ratiossteel shankcarbide shank
are affected by many factors:shank diameter ratio 4:1ratio 10:1

(mm) (mm) (mm)

  • Type(s) of material(s) being machined.

4,00mm 16,00mm 40,00mm

  • Depth of cut(s).
  • 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 many8,00mm32,00mm80,00mm
cases, changing the RPM of the machine can reduce chatter.10,00mm40,00mm100,00mm
12,00mm48,00mm120,00mm
16,00mm64,00mm160,00mm
20,00mm80,00mm200,00mm
25,00mm100,00mm250,00mm
32,00mm128,00mm320,00mm