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109
SWISS
CNC
MULTI-
SPINDLE
DAVENPORT
BROWN &
SHARPE
V-FLANGE CHUCK
COLLETS
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 toolholders. 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.
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 toolholder, 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 toolshank
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 sub-
stantial reduction in cost per part.
CAT. V-FLANGE SHANK
ENCAPSULATED BALANCED ER COLLET CHUCK
SEE PAGES 116 & 117 FOR COLLETS.
CAT. SHANK
Collet
Cat. No.
Series L L1
D
J
G
G1
CV40ER32E ER32 1.124 .374 1.574 5/8 X 11UNC 5/8-11 M40 X 1.5
CV40ER40E ER40 2.124 .374 1.968 5/8 X 11UNC 5/8-11 M50 X 1.5
CV50ER32E ER32 1.124 .374 1.574 M22 X 1.5
1-8
M40 X 1.5
CV50ER40E ER40 2.124 .374 1.968 M28 X 1.5
1-8
M50 X 1.5
BT SHANK
Collet
Cat. No.
Series L L1
D
J
G
G1
BT40ER32E ER32 1.437 .374 1.574 M16
M16 M40 X 1.5
BT40ER40E ER40 1.830 .374 1.968 M16
M16 M50 X 1.5
BT50ER32E ER32 1.437 .374 1.574 M22 X 1.5 M24 M40 X 1.5
BT50ER40E ER40 1.830 .374 1.968 M28 X 1.5 M24 M50 X 1.5