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| Built at: Dec.25.2002 Last update: Dezember 06, 2004 |
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Diese Seite ist auch in Deutsch verfügbar. |
One of the most frequently asked question is about the suspension and the rotating gear of a KAP-Rig. There are a lot of solutions for that theme and I will describe that one, that I have used at my Rig#1 and my Rig#4.
| Servomovement with a normal Servo and gearbox: | ||||
| A customary servo can execute a rotation of approx. 90 to 100 degrees. So that the camera can be turned by 360 degrees, a transmissions must be switched between. At the servo there is a gear wheel with 48 teeth and at the hanging shaft there is one with 12 teeth. By this translation a rotation of 360 degrees is reached. Unfortunately, the rotationspeed also increase around the factor 4 so that this movement must be used very delicately at the transmitter. Because the big gear wheel only concerns 90 degrees, the superfluous part has been removed to the save weight. If the rotation servo moves now, then the hanging shaft rotates 360 degrees. If the complete Rig hangs on the hanging shaft later, the complete Rig turns itself around this shaft. | 
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AVI Video-Clip, 320 x 240, 4 sec. 79 k Byte Rotationservo powers the hanging shaft of the Rig#4. Camera SONY P5 |
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It is very important that you always remember, that the complete Rig with the camera hangs only at the hanging shaft. By a "windy construction" of this part you can produce injury to persons and material and lose the complete equipment! |
| Details to the drive of my Rig#1 The hanging shaft consist of aluminum with 5 mm diameter. At the bottom there is a small part with 10 mm diameter. A synthetic material shim serves as a slide bearing on the underside. An aluminum square pipe serves as a holder for the hanging shaft. The hanging shaft isn't beared especially, it simply is in the drills of the frame. The big gear wheel has 50, and the small pinion on the shaft has 12 teeth with module 1.
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Rotation servo with gear box 4 : 1
of my Rig#1: |
A synthetic material shim serves
as a slide bearing |
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The gear box from the side. |
The drill in the hanging shaft is
for mounting the |
| Details to the drive of my Rig#4:
The principle of the drive is the same as at my first Rig. The
whole construction is, however, fundamentally more smally and more
easily. The holder for the hanging shaft exists out of aluminum square
pipe with only 10 x 10 mm. The hanging shaft is in slide-bearings out
of brass. Because the big gear wheel with formerly 48 teeth only turns
by 90 degrees, the superfluous part has been removed to the weight
saving. The small pinion is only drilled small and pressed on the
hanging shaft. Small lengthways notches in the steel-shaft effect that
there is no slip. The gear wheels have the size Module 0.8. The whole
construction is powerd by a small servo with brass gear-box.
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Rotationservo with gearbox 4 : 1
for rotation |
The holder for the hanging shaft
exists out of |
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The brasshull is only an adapter
for the picavet. |
The small pinion with 12 teeth is
only drilled small |
| My Rig#4 hanging at the suspension gear,
the Picavet#2: The hanging shaft is in the hull of the Picavet#2 and is fixed by a coachwork pin. If the servo now moves by 90 degrees, the gear box translates the rotation to 360 degrees. The shaft itself can not move, because it is fixed at the picavet. So the whole rig rotates around the hanging shaft. By this rotation the camera can be moved into the right direction. |
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The hanging
shaft is in the hull of the Picavet#2 and is fixed by a coachwork pin. |
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Links to other KAPers and more you can find in my Surfers Guide.
I like to be available for questions, suggestions or experience exchange.
I would be very pleased about an entry in my visitor's book.
Manfred
http://KAP-Man.de
Manfred
