It is
now not only possible, but practical to
create coils from very fine wire, twenty-five
microns (0.001 inch) in diameter and below
with coil diameters as small as fifteen
microns (0.006 inch). To
accomplish this,
Kinefac developed a New Sub-Micro
Wire
Feed System
and ultra precision Sized To
The Wire
tooling which can be installed on
the field proven Micro-Coiler. The very small
12.5 mm diameter feed rolls and
micrometer adjustable roll pressure provide
precise wire control. The corresponding
shortened wire guides with their input ends
precision lapped to fit the feed roll curvature
effectively control the buckling as the wire
enters the guides. At the
output end, the
wire guide groove depth is specifically
sized to the actual wire diameter to provide
absolute minimal clearance between the
groove and the arbor allowing free motion
while providing to precise positioning of the
wire as it enters the coiling point.
The arbor is also sized to
provide precise
control of the coil diameter with exact
compensation for the cutoff spring back
found in the actual wire being coiled. The
final critical tool element is the super
finished, Sized To The
Wire coiling point. It
is provided with preset pitch alignment and
is axially adjusted by the Micro-Coiler
micrometer tool location system which can
position it axially by 0.1 micron (0.000004
inch) increments.
The pitch tool is of the
conical type with a
3.0 micron point.
The pitch and diameter
tools are actuated by the Micro-Coiler CNC
control system to a programmable accuracy
of one micron (0.00004 inch). This is |
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Sub
Micro Wire Feed System with .250 inch feed rolls |
achieved through the use of a
very low rise,
low friction cam directly mounted to a high
resolution servo motor.
Finally, the coil cutoff is
achieved by a
controlled rake shear tool with CNC actuated
stroke which can be axially positioned by
micrometer adjustment in one half micron
(0.00002 inch) increments.
By
these means, the Sleeper Division of
Kinefac has produced a deflection coiling
machine which is unsurpassed anywhere in its
ability to produce very small diameter high
precision coils from very fine wire with
straightforward set up, excellent repeatability,
and high productivity.
This unique coiling
machine opens up new design opportunities to
the makers of electrical contacts,
neurovascular catheters and aneurysm control
devices, and a wide range of other medical
and electronic micro devices.
Kinefac News Release - 8/25/02
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