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These encapsulated chucks can increase
productivity up to 70% due to the cantilevered beam’s closeness
to the spindle bearings reducing deflection, which improves T.I.R.
The deflection under load is proportional to the cube of its
length, underlining the importance of minimizing the overhang.
Generally, the greater the rigidity of a tool holder, the greater
its damping capacity, dynamic stiffness and integrity. Chatter,
relative vibratory motion, occurs when the relative dynamic
stiffness at the cutting edge is insufficient to perform the
cutting operation; consequently, the chip thickness varies causing
variances in the magnitude of the cutting force. The tool shank or
bar, being elastic, causes deflection and begins to vibrate. In
metal removal operations, vibration is the most common cause of
unsatisfactory accuracy, finish and poor tool performance. The
less deflection (causing less run out) under load enhances metal
removal rates, increases productivity and reduces cycle times for
a substantial red uction in
cost per part.
The increased wall thickness, i.e. more
cross-sectional area, at the flange face (I.D. thread) than
standard ER nose (O.D. thread) holders, allows for greater
gripping power to expand its application range (more cubic inches
of metal removal).
The T.I.R. has been measured at (.000 05) and
no greater than (.0002) at the nose verses (.0004 to .000 55) of
the O.D. ER nose thread-type tool holders. Guaranteed maximum
concentricity between the O.D. and I.D. is no greater than (.000
12).
All these holders are balanced to G2.5 @ 20,000 RPM.
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