Maximum width of a t bar on a tripod? |
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kevin tyler
Old Croc Joined: 15 April 2007 Location: Spain Status: Offline Points: 3402 |
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Posted: 13 August 2017 at 11:29am |
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Hi guys
Sorry it's not speakers but I'm sure you can help. What would you say is the maximum safest width of a t bar that sits on top of a single tripod. I want to mount 6 led spots and a mirror ball type led fixture on a single bar on a single tripod. The spots are 1.2 kg each and the other fixture, an adj starbust is 3.7kg Many thanks Kev |
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dylan-penguinmedia
Old Croc Joined: 14 April 2011 Location: Brighton Status: Offline Points: 4576 |
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6ft?
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BJtheDJ
Young Croc Joined: 28 November 2012 Location: Bristol Status: Offline Points: 884 |
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All depends on the width of the tripod base really, and how much weight you're putting up in the air.
I have few large 35mm wind-up stands that I use when I can't get the room on the stage, with pre-mounted lights on the T-bars. My T-bars are all Powerdrive flat bars, and a heavy single-person lift - but once on the stand with the legs spread they're very stable; one's loaded with 4 ImpossibLeds and another has a set of 4 Revo 4's; others have mixtures of random lights and lasers Check them for stability before taking them out on a gig and get an idea of how wide the legs need to be spread by pushing the tripod onto two legs and seeing at what position it becomes unstable - but you're not putting a whole lot of weight up so you should be OK. Also a good idea to make sure that the widest point of the feet runs parallel I run two Starbursts and Edited by BJtheDJ - 13 August 2017 at 4:45pm |
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kevin tyler
Old Croc Joined: 15 April 2007 Location: Spain Status: Offline Points: 3402 |
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That's a great response thanks so much.
Will make sure it's safe before I go out gigging. Cheers. Kev |
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jacethebase
Old Croc Joined: 23 September 2009 Location: Somerset Status: Offline Points: 5697 |
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6ft I'd say. I very often used to put a 6 way bar on a manfrotto at 3+ meters.
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ceharden
The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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As a rule of thumb I would not go wider than the legs on the tripod.
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kevin tyler
Old Croc Joined: 15 April 2007 Location: Spain Status: Offline Points: 3402 |
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Hi guys
I had a good think and I decided to use a 2 m bar 50mm diameter between two stands with a 50 mm half coupler on each stand. Should be better I think Many thanks. Kev Edited by kevin tyler - 14 August 2017 at 10:16am |
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MattStolton
Old Croc Joined: 04 September 2010 Location: Walthamstow Status: Offline Points: 4234 |
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Even a perfectly balanced load, even a point load, on a stand, as you raise it up, the C.o.G. of the stand moves up.
As C.o.G. goes up, "wobblyness" will ensue, and any impact or wind factors will eventually bring it down again. 2 Stands and a bit of scaff, ladder, or truss, keeps the overall C.o.G. low, and within the base area of the stands, and in relative stability. So, in answer to OP, as you go higher, narrow the width of bar, even with perfect balance on the bar. I would never extend the bar outside the "diameter" of the base. If you have to do that, then extend to second stand, and go "goal post". Most stands will have some sort of Max point load, and decent ones may even show reduction in load for any particular extended height. Many are not rated for out door use too. |
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Matt Stolton - Technical Director (!!!) - Wilding Sound Ltd
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norty303
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Is this a question, or a challenge?
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MattStolton
Old Croc Joined: 04 September 2010 Location: Walthamstow Status: Offline Points: 4234 |
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I reckon the max is 6m, i.e. a standard length of a scaff pole....
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Matt Stolton - Technical Director (!!!) - Wilding Sound Ltd
"Sparkius metiretur vestra" - "Meter Your Mains" |
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kevin tyler
Old Croc Joined: 15 April 2007 Location: Spain Status: Offline Points: 3402 |
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Thanks so much guys.
Really appreciate the help Kev |
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jacethebase
Old Croc Joined: 23 September 2009 Location: Somerset Status: Offline Points: 5697 |
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Please please post pics :) You sir will forever be an legend if you can post a picture of a 6m bit of scaff used as t bar on a manfrotto :) |
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