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The master piece of this
rig is the device to fix it in the hoisting hook of any
crane: telescopic, revolving, gantry crane.
It is a stainless steel strip,
35 mm wide and 2mm thick, bent as a loop. The loop can be
adjusted or changed to another one to fit the crane hook.
It is locked with a Ø 8 mm screw.
It is important that the rig is
locked in the hook. Even if moves are usually smooth, an
unexpected shock or some kinds of vibration may occur any
time.
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Under this essential link, any
usual kap rig can be fixed.
However, as there is no weight limit, It
is worthy to have an heavier rig and fit more accessories and
bigger batteries.
The one displayed here has been
designed to support reflex camera and have additional flashes
for workshop photography, so it is a double floor rig. The
frame is made of aluminum sections. It weights 1.3 kg without
any camera or device.
The rotational electric device
has been dismounted, as it is also the BBQ rotisserie motor.
Because the inertia is much larger than for light kap rig,
the rotational device has to be robust.
The white box near the camera is
a ring bell radio receiver that trigger the camera.
In fact, when there is not enough load, the
hook can rotate endlessly and slowly on its axis bearings.
Outside, a large wind vane is helpful and
necessary to maintain one direction as sometimes the wind can
rotate the rig like a wind mill. |
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