Page 464 - Master Catalog 2017, Inch

Technical Information
Setup Recommendations

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
chatter, poor fi nishes, or inadequate tool life. Toolholder

Overhang

We recommend a 4:1 ratio (4 times bar diameter) overhang when steel shank carbide shank
using steel shank bars and up to a 10:1 (10 times bar diameter) shank diameter ratio 4:1 ratio 10:1
overhang when using carbide shank bars. The overhang ratios (inch) (inch) (inch)
are affected by many factors:
• Type(s) of material(s) being machined. 0.156" 0.625" 1.560"
• Depth of cut(s). 0.187" 0.748" 1.187"
• Feed rate(s). 0.250" 1.000" 2.500"
Recommended conditions may still be unsatisfactory because 0.375" 1.500" 3.750"
of chatter. Chatter can be induced by non-rigid setups or
harmonics from the machine or machining conditions. In many 0.500" 2.000" 5.000"
cases, changing the RPM of the machine can reduce chatter.
0.625" 2.500" 6.250"
0.750" 3.000" 7.500"
0.875" 3.500" 8.750"
1.000" 4.000" 10.000"
1.250" 5.000" 12.500"

steel shank carbide shank
shank diameter ratio 4:1 ratio 10:1
(mm) (mm) (mm)
4,00mm 16,00mm 40,00mm
5,00mm 20,00mm 50,00mm
6,00mm 24,00mm 60,00mm
8,00mm 32,00mm 80,00mm
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

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