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 Coaxial cables interconnect the many modules and components found in a high-frequency
system. In recent years, manufacturers of high-speed computers have resorted to semirigid
and flexible coaxial cables to make connections between printed-circuit boards (PCBs). While
most designers try to minimize the lengths (depending upon phase relationships) and numbers
of coaxial cables found in a system, they are necessary for signal-routing operations. For
those systems integrators who require moderate to large amounts of coaxial cable, help in
handling has finally arrived: the CNCA-700 automatic cable cutting and stripping machine
from Spectrum Elektrotechnik GmbH. The machine, which handles semirigid and flexible
cables with diameters to 0.5 in., features fast setup time and standard tooling.
Spectrum Elektrotechnik GmbH, which is well-known as an international supplier of coaxial
connectors, cables and cable assemblies through 50.0 GHz, has long used embeddedcomputer-
controlled CNCA-700 internally for processing cables. The same machine is now
available to other cable manufacturers requiring large numbers of cable assemblies.
In operation, a cable mounted on the CNCA-700 is turned by and between two spindles
which can be positioned very closely together. Both spindles move simultaneously, each
driven by its own stepper motor. The stepper motors can stop the spindles with an accuracy
of 0.0004 in. (0.01mm). Adjustments in stripping length can be made with 0.002-in. (0.05-mm)
resolution and adjustments in stripping diameter can be made with 0.0004-in. (0.01-mm) resolution.
The cable feed is at one spindle. The other spindle works as a push/pull device, picking up
the cable and pulling it to length and /or pushing it back when necessary and supporting the
cable again during the machining of the cable/connector interface.
The cutting device is a standard tungsten saw, located in another stepper motor drive. The
saw turns at high speed, providing rapid and clean cuts. The cutting speed can be readily
adjusted to optimum speeds for different metals, such as aluminum, copper, or stainless steel.
The tungsten saw also points the center conductors.
Cable assemblies are cut, stripped and transported onto a conveyer belt under computer control.
To aid program development, a standard personal computer can be connected to the CNCA-700.
The CNCA-700 permits the user to change certain parameters during operation. For example,
by entering depth corrections or values for a cable assembly length via a computer keyboard,
the cutting depth and/or cable length can be changed during operation. By exchanging the
brackets at the stripping arm and the standard collects in the CNCA-700's spindles, and
selecting a new software program from the menu, the machine can be adjusted within minutes
for a different cable diameter.
The CNCA-700 is shipped with a variety of dedicated software tools for cutting and stripping
standard semirigid cables from 0.034 to 0.5 in. in diameter. Programs are also included for
stripping some standard flexible cables.
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