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Old 10-24-2016, 02:07 PM   #1
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Default swaying lights

I have some 1X4 lights hanging from aircraft cable. no HVAC grills or diffusers nearby. I have one row of lights that swing like crazy. some weird convectional currents. Any easy solutions. I was thinking 3/8" reddi-rod but these lights are swinging like crazy. I think they would still swing on rod. the lights are suspended by about 12' of cable so 45 degree ties would look silly.
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Old 10-24-2016, 03:07 PM   #2
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Can you raise or lower them to avoid the wind? Sleeve the cable with 10' of pipe (or enough to get below the air currents) with a flange fitting to bolt to the ceiling.
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Old 10-24-2016, 03:39 PM   #3
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Default Don't need to be 45 degrees

You don't need to be out 45 degrees with extra cables. Try just running a second pair of cables about 2 foot out from the support cables. That way when the breeze blows one way the outside guide cable stops it same as other side.
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Old 10-25-2016, 06:39 AM   #4
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Can you post a video clip?
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Old 10-25-2016, 10:02 AM   #5
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What about putting weight on top of or inside of the light?
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Old 10-25-2016, 12:54 PM   #6
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How about informing the customer there is a design flaw with them choosing to put hanging lights in an area that has a wind tunnel, and let them or the designer sort it out. Otherwise , 1/2'' rigid stems. Either way, $$.
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Old 10-25-2016, 12:58 PM   #7
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This leads me to my next rant. We make the lights come on. It is up to the building designers to properly pick the type of lighting for the application. I don't let customers try to put that responsibility on me, unless it is a simple overlooked dark area needs some light problem , and another fluorescent or a pull chain or a recess can ...........
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Old 10-25-2016, 01:05 PM   #8
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Maybe the customer asked him to do it and he wants the work and to show the customer that he can take care of issues for them?

I am thinking that lead sheets, like what is used in lead-lined walls in hospitals, would be great to lay on the top of the lights in a few layers. The weight will dampen the swinging quite a bit and possibly stop it altogether.
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Old 10-25-2016, 01:18 PM   #9
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Maybe the customer asked him to do it and he wants the work and to show the customer that he can take care of issues for them?

I am thinking that lead sheets, like what is used in lead-lined walls in hospitals, would be great to lay on the top of the lights in a few layers. The weight will dampen the swinging quite a bit and possibly stop it altogether. Also, when it lands on their head, they will forget all about the swaying.
fixed it for ya
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Old 10-25-2016, 01:27 PM   #10
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fixed it for ya
Can you stop be ******ed for a minute please.
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Old 10-25-2016, 01:50 PM   #11
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Can you stop be ******ed for a minute please.
now what fun would that be ?
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Old 10-25-2016, 03:23 PM   #12
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I think they stopped making that lead lined sheetrock. Some EPA garbage.

But the adding weight is a great idea.
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Old 10-25-2016, 03:27 PM   #13
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I think they stopped making that lead lined sheetrock. Some EPA garbage.

But the adding weight is a great idea.
I don't doubt it. It's been 10 years since I worked with it. I remember getting sheets of the lead and having to fold it over every fastener I put in the wall.
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Old 10-25-2016, 03:44 PM   #14
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You're dealing with 'resonance.'

Google it.

To take the cables 'out of tune' -- use split bolt connectors -- try part way up. Just clamp them around the cables -- there being nothing to connect to, of course.

They don't have to be particularly massive, either.

Even one split-bolt connector should ruin// shift the resonance frequency.

The nice thing is that this fix is reversible and pretty cheap... and uses stuff we touch all the time.

Come back and thank me later.
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Old 10-25-2016, 09:22 PM   #15
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Quote:
Originally Posted by telsa View Post
You're dealing with 'resonance.'

Google it.

To take the cables 'out of tune' -- use split bolt connectors -- try part way up. Just clamp them around the cables -- there being nothing to connect to, of course.

They don't have to be particularly massive, either.

Even one split-bolt connector should ruin// shift the resonance frequency.

The nice thing is that this fix is reversible and pretty cheap... and uses stuff we touch all the time.

Come back and thank me later.

Resonance my butt.

At 12 ft of cable, it doesn't take much air flow to cause the fixtures to sway.
Try to figure out which vent is causing the disturbance, and see if you can either damper down or divert the air flow.
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Old 10-25-2016, 09:36 PM   #16
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Maybe an exorcist if nothing else works!
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Old 10-25-2016, 09:55 PM   #17
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I like haXer but that is a stupid assesd idea. Use a bit heavier chain or cross brace them from an angle.
The aircraft cable was a mistake so now just go fix it.
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Old 10-25-2016, 11:21 PM   #18
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Resonance my butt.

At 12 ft of cable, it doesn't take much air flow to cause the fixtures to sway.
Try to figure out which vent is causing the disturbance, and see if you can either damper down or divert the air flow.
Chill down - and spend a year in college level physics.

That's where this matter is beaten to death... and I mean beaten to death.

If air blast was causing this it's still not enough... not enough to be spotted -- so we're not talking an air vent -- rather it's so mild it's a puzzle.

Last edited by telsa; 10-25-2016 at 11:24 PM.
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Old 10-26-2016, 12:11 AM   #19
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Quote:
Originally Posted by g-alberta View Post
I have some 1X4 lights hanging from aircraft cable. no HVAC grills or diffusers nearby. I have one row of lights that swing like crazy. some weird convectional currents. Any easy solutions. I was thinking 3/8" reddi-rod but these lights are swinging like crazy. I think they would still swing on rod. the lights are suspended by about 12' of cable so 45 degree ties would look silly.
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Originally Posted by telsa View Post
Chill down - and spend a year in college level physics.

That's where this matter is beaten to death... and I mean beaten to death.

If air blast was causing this it's still not enough... not enough to be spotted -- so we're not talking an air vent -- rather it's so mild it's a puzzle.
Read his post. Swinging fixtures , not small vibrations

Resonance: a vibration of large amplitude in a mechanical or electrical system caused by a relatively small periodic stimulus of the same or nearly the same period as the natural vibration period of the system

Since you cant dazzle us with brilliance, you try to baffle us with BS
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Old 10-26-2016, 12:17 AM   #20
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Hell, try the weight idea: Just zip-tie a piece of unistrut to the top of the light and see if that does the trick. If it does, bolt it in.

Otherewise, how far apart are the rows? Is it possible to reach the next stationary row with a piece of all-thread where a horizontal rod at each end might be enough to keep it all from moving.
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