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Old 01-06-2009, 11:06 PM   #1
AcquaCow
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Default Clockspring to support 10-15 wires and ~10 turns lock to lock?

Hi,

I'm working on a small electrical experiment that involves a rotating part...

It needs to rotate a good bit, which makes traditional wiring an issue.

Anyone know of a clockspring setup that'll support this much wiring, or possibly a better option?

Thanks,

-- Dave
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Old 01-06-2009, 11:13 PM   #2
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You could build something like the below link where each circuit is on a tier above the other. This would minimize the overall width, but the depth would be greater.

http://www.power-delivery.com/z_swiv...nnector_01.php


Or you could go with the tradition slip ring approach.
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Old 01-06-2009, 11:19 PM   #3
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Quote:
Originally Posted by RumblingREX View Post
You could build something like the below link where each circuit is on a tier above the other. This would minimize the overall width, but the depth would be greater.

http://www.power-delivery.com/z_swiv...nnector_01.php


Or you could go with the tradition slip ring approach.
Ooh... that could simplify things a lot... I may just be able to install what I want on the rig and use external power, instead of trying to feed video signals through clocksprings...

I could just put the entire unit on the swivel...

Hmm...

-- Dave
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Old 01-06-2009, 11:23 PM   #4
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Actually, maybe not...

I don't know how I'd support a central rotating axle with that power connector...

I'd have to be able to run the axle through it, centrally... which is why I originally went for a clockspring...

-- Dave
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Old 01-07-2009, 06:41 AM   #5
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what about a circuit board with "rings" that can spin with the device, then "fingers" on the solid side that pickup on the rings. may be too wide for your application though. Hard to explain without a diagram.
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Old 01-07-2009, 07:14 AM   #6
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it stinks like sex in here
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Old 01-07-2009, 09:21 AM   #7
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Quote:
Originally Posted by spongejosh View Post
what about a circuit board with "rings" that can spin with the device, then "fingers" on the solid side that pickup on the rings. may be too wide for your application though. Hard to explain without a diagram.

that would be a slip-ring. They are available 'OTC' but can be pricey and maybe not practical with a high number of connections or high power.

'Wetted' slip-ring will probably be best to cut down on noise. If they are still made (mercury inside)

Maybe 'flexible' circuit board like used in cameras and other applications? Just VERY long so it could spiral in-out.

Any possibility of doing some data transfer wirelessly?(Zigbee or ?) maybe just need 2 or a a few slip-ring connections that way. Or On-board battery power + wireless comm.



Carl
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Old 01-07-2009, 10:31 AM   #8
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Can you pre-wrap regular ribbon cable 10-11 times? maybe spiraled down a shaft?(candy cane style) Just prep it for the maximum twist to the 'lock' in one direction. If the shaft has some length, the actual diameter the cable 'unwraps' when turned to the the opposite lock may be minimal. If wrapped around itself, yeah, could get kinda wide I guess.


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Old 01-07-2009, 01:11 PM   #9
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Actually, if the ribbon/flat cable would reliably 'flip', you only have to pre-wind 1/2 the number of turns. Let it wind-unwind in both directions.

Also, if you feed the wires out throug the middle, or interior of a hollow shaft, you only need to pre 'torque' 1/2 the number of turns. And the longer the cable/harness is, the less total deflection/force is on the system.

Carl
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Old 01-07-2009, 01:14 PM   #10
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Use a moebius clock spring, it makes wiring much easier since there's only one side.
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Old 01-07-2009, 01:45 PM   #11
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Quote:
Originally Posted by Kiel View Post
Use a moebius clock spring, it makes wiring much easier since there's only one side.
and if you cut it along the middle all around it - you still have one that is just bigger in diameter!
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Old 01-08-2009, 10:31 AM   #12
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AC - did you find a solution?

what was it?


Carl
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Old 01-08-2009, 01:06 PM   #13
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Quote:
Originally Posted by 1 Lucky Texan View Post
AC - did you find a solution?

what was it?


Carl
Nope, nothing yet...

May end up stacking 3-4 normal clocksprings to get enough wiring...

-- Dave
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