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Chatter Suppression Method of

ISCAR's Anti-Vibration Tools

Cutting tool vibration is a well-known problem in machining. The most common
issue is that of self-excited vibrations, also known as "chatter."

During machining, a vibrating tool generates undulation on a workpiece surface.
In a subsequent tool pass, the cutting edge would then be machining the previously
generated wavy surface - leaving behind a newly generated wavy pattern, as shown
in the figure below. The chip thickness and therefore the cutting forces vary with
time. This phenomenon can greatly amplify vibrations and develop chatter.

Chatter vibrations are detrimental to the safety and quality of machining operations. CHATTER SUPPRESSION METHOD OF ISCAR ANTI-VIBRATION TOOLS
They cause a rough surface finish, increase cutting forces, reduce tool and
machine life, decrease productivity, and create irritating high noises.

During internal turning, the tool usually has a large overhang (large L/D). In general, where
L/D>3, chatter vibrations become apparent due to high tool flexibility and low damping.
ISCAR's anti-vibration tools are designed for operations in which large overhangs
are required. These tools include Dynamic Vibration Absorber (DVA) systems to
increase damping and therefore stability during machining – see figure below.
The DVA is a heavy Tungsten mass supported by elastomeric components and
located in an internal cavity at the furthest available position in the tool.

mass
DVA mass
DVA
physical
model

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