Truss on crank lifts

Hey all,
I've got two Applied 11' crank lifts, currently using t-bars but we're looking to replace those with box truss. What would be the best way to go? I'd want to put 6 movers (technobeams, maybe mac 250's??) on the truss.
My questions are:
What lengths of truss would be ok to use? 2x5' seems to be a bit short, is it safe to use 2x8' bolted together?

and i'm assuming that the lifts would need to be centered under each piece of truss, correct?
The load would be between 210lbs and 330lbs

thanks
 
Hmmm smells vaugely of Rigging.
Not a good way to answer that question without violating the TOS. I'm sure there are several folks around here that can answer that question, but for liability reasons we simply can't. Sad I know, but true. I'm sure if you get in touch with any dealer, they can give you the ratings and specs on the truss you're looking at. They can usually supply you with a chart showing the load ratings for a given piece(s) of truss at various spans, as well.
 
Darn Those pesky rules ! :mrgreen:
 
Hey, tie line has a tensile strength of 100 lbs. If you use 4 pieces of tie line then it should be fine!

Right? Isn't that how rigging works?
 
Hey, tie line has a tensile strength of 100 lbs. If you use 4 pieces of tie line then it should be fine!

Right? Isn't that how rigging works?


Hehe, I'm envisioning four/five movers strapped onto tieline, and just out of the blue a fly comes along, oh-so-carefully lands on the tieline, and the entire rig collapses.

Reminds me of the old Pinto. If you came to a stop and there was a bug following you, if it suddenly crashed into your rear bumper the entire car would ignite.
 
I've got two Applied 11' crank lifts
The load would be between 210lbs and 330lbs
NO!!!!!!!!!!!!
-
L11's are rated for 200lbs maximum at 10 feet 6 inches.
If you get an imbalance and it throws the load, even partially onto one tower you are done for.
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L-11 Weight Loading Info

* Maximum Weight Rating: 200 lbs. at 10' 6"
* Weight Loading Certified By Structural Engineering Firm
 
To avoid talking about rigging in public check your PM.
 
Not knowing any of the specifics of your equipment, make sure, 5:1 safety factor, please. Just because something is rated for X much weight doesn't mean you should ever load it to anywhere near that.
 
Hey, tie line has a tensile strength of 100 lbs. If you use 4 pieces of tie line then it should be fine!

Right? Isn't that how rigging works?

I thought tie line was rated to 500lbs? Am I wrong?

Though I did see several pieces snap clean through when some genious decided to fly out the projection screens on my last show. That was a real mess (the screens only weighted about 20lbs, but they didn't fit between the battens on the sides of them.).
 
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Not sure this is really a rigging question. Truss on Crank up stands starts at the entry level dj LEVEL and works up

Basic logic says you need to have the truss extend from one stand to the other, your stands manufacturer will have a truss mount connector. Global truss makes the one I am familiar with. So a tbar configuration is definitely OUT.

I usually look at Rigging as configuring a special setup for hanging etc, and not to include the pretty common off the shelf stands and truss setup.
Sharyn
 
your best bet is calling the manufacturer and asking them. I personally would never use something that light duty to hold a bunch of movers. If you span truss, you have to take in the weight of the truss, cableing, and fixtures. Then muliply that number by 5. now since those stands are rated for 200 lbs, you have a theroetical max weight capacity of 400 lbs. you can then carefully span your instruments across the truss. When i do this I use much mroe heavy duty lifts, but i also put some fixtures on the outside of the lifts also to counter balance the center smile in the truss. But once again, this is only a story of what i have done, and i'm not saying do what i say or do what i do. Just talk to applied, they are very friendly and helpful people, but this does give you an idea.

Now the disclamer.
NO one is responsible for what you do except for you.
 

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