| permanent install, Moving Heads [message #323190] |
Thu, 15 May 2008 17:19  |
 David Best xe
Messages: 2
Registered: May 2008 |
Newbie |
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OK...
I'm a newbie when it comes to moving heads.
G-lites 575s, almost 100lbs.
How would you recommend installing them into a theater?
5 in the back (above the stage) 2 on either side of stage.
Ceiling structure is open ceiling with exposed beams. We have a 1 1/2 inch pole for our use that is mounted to the beams on either side (very sturdy).
As for the 2 on either side of the stage in front, the ceiling is angled like a regular roof. It still has the beams like the back but no poles.
Would unistrut, beam clamps, 1/4 threaded rods and 1 1/2 pole work to hold two of these massive lights?
Will the pole in the back support the 5 movers safely without too much sway?
Any help would be great.
PS, we can not use any trussing as the owner does not want to see it flying in the air.
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| Re: permanent install, Moving Heads [message #323614 is a reply to message #323190 ] |
Sat, 17 May 2008 06:00  |
Dan Glass
Messages: 106
Registered: May 2004
Location: West Chester, PA |
Has No Life |
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That's a big and kinda scary questions to ask in a forum. I can honestly say that you need to contact a local lighting company that can come do a proper site survey. It would be next to impossible for anyone to sanely give you an answer based on the info you provided. There are to many variables and factors that you literally have to inspect before you can properly hang anything. I know this is not what you wanted to read for a response but I didn't want to see you hanging out here waiting for an answer that might not happen. When it comes to hanging things (especially 100#) over someones head you have to be safe, overly safe. There is no such thing as a small accident or minor incident when it comes to rigging. i am sure that you have a great deal of experience when it comes to working in the theater, on live shows, and the like but because you asked this question on a message board I would beg you to please contact the local, reputable, rigging or lighting company and ask them to check it out and make a recommendation based on what they find. You probably will end up getting some advice on this message board but take it as just that, advice.
Dan Glass
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| Re: permanent install, Moving Heads [message #323651 is a reply to message #323627 ] |
Sat, 17 May 2008 09:47 |
Dan Glass
Messages: 106
Registered: May 2004
Location: West Chester, PA |
Has No Life |
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Most moving head fixtures either come with 2 sets of clamps (2 in each pair) that lock into the bottom of the base of the structure or they have pre drilled holes that allow 1/2" bolts to pass thru. When it comes to hanging a moving head verses a mirror based fixture the important thing to remember is that the mirror fixture is a "static" load which means that the weight does not change because only the mirror moves, but with a moving head the weight is constantly shifting and changing. As an example, when the fixture pans from one side to the other you create inertia so now you have the normal weight of the fixture (in this case 100#) plus the gforce of the fixture pulling sideways. Then when the fixture pans back the other way the weight is shifted in the other direction. So whatever you have the light mounted to is getting a constant pulling down from gravity plus as the fixture moves it creates a twisting motion. This is why you have to be rock solid on how you hang these and also why you have to constantly recheck your rigging on a schedule not just when you have to change a lamp. I feel bad that the owner will not allow you to have some form of truss so you can lower the fixtures and I really hope that you have an easy way to get up to them that doesn't require some perilous design of putting the ladder on top of a folding table (sounds silly but I unfortunately have seen it). You know they do make truss in black to match the ceiling color, just a thought.
Dan Glass
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| Re: permanent install, Moving Heads [message #326346 is a reply to message #323651 ] |
Mon, 26 May 2008 23:45 |
Duane Massey
Messages: 1282
Registered: January 2006
Location: Houston, Tx |
Has No Life |
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I won't get into the safety issue, as that should be your primary focus, but most moving head fixtures are set up to use two pipe clamps and a safety cable. The critical part, other than the quality of the clamps you choose, is the stability of the pipe you hang from. If it doesn't move, the fixture shouldn't either. This means that chain, cable, or threaded rod will not be suitable to secure the pipe just by hanging it.
Duane Massey
Houston, Texas, USA
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| Re: permanent install, Moving Heads [message #331199 is a reply to message #326346 ] |
Fri, 13 June 2008 06:02 |
Jim Crews
Messages: 45
Registered: November 2005
Location: NW Arkansas |
Should Get Out More |
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Call Mike at Polar Focus. They can design, certify every aspect of your hardware. We use them all the time.
http://www.polarfocus.com/
Jim
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