Recent content by fredthe

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    Mandalay Bay video wall fall

    I wasn't familiar with verlocks, so I went looking. I found one reference that specifically said "Not To Be Used For Overhead LIFTING" though it seems marketed for that. I've also seen both 425 and 500 lb WLL quoted, and have yet to find an official spec.
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    Affixing screen to truss

    As a follow-up, we ended up doing a combination of the above. Two slings (one on each side) from the truss to the bottom of the screen frame (they happened to be the correct length) and then load-rated zip ties to fix the screen to the truss. Very secure and stable, and we had backup safety...
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    Affixing screen to truss

    Thanks, that's what I was thinking, but I couldn't find an appropriate clamp. I'll look at those, though as danTd points out there might be a bulge issue. I was hoping to find something off-the-shelf, mostly because I won't have access to the screen frames to check alignment until the event...
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    Affixing screen to truss

    I was already considering something from the screen to the hoist chain to keep it from rolling the truss, though there will be close to 200 lbs of lights and speakers hanging form the bottom (I'd have more, but the venue only has 500 lb hang points). I guess to clarify my question, what...
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    Affixing screen to truss

    So I've got a temporary install that needs a 7.5'x10' FastFold screen, rigidly attached to a horizontal truss (see picture.) Everything I've seen on screens and trusses generally involved hanging, but to get everything at the correct height the screen needs to be centered on the truss. Any...
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    Manual Winch for electrics - looking for reference documents

    The reference comes from the PLSN article which references the OSHA standards for overhead and gantry cranes as being the closest to cover theatrical rigging, and the referenced regulation makes no mention of people under the loads. I was looking for regulations/standards that covered this...
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    Manual Winch for electrics - looking for reference documents

    For those that asked, this was a Jeamar model WG, marked with a SWL of 2200 lbs. Single cable from the winch, somehow connected to 5 lines from headblocks to the electric. The electric itself was fairly standard, double pipe, with about 10 8" fresnels, a couple of lekos, and two movers that...
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    Manual Winch for electrics - looking for reference documents

    Thank you all for the replies. It appears that the failure was due to wear, I suspect it was the brake mechanism was what failed, but there was also excessive play in the shaft that is driven by the winch handle which may have contributed. The handle spun rapidly as the electric descended. The...
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    Manual Winch for electrics - looking for reference documents

    It's a good thought, but wouldn't have helped in this case... it failed while the load was moving.
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    Manual Winch for electrics - looking for reference documents

    Many of the schools in my area use manual hand-crank winches (similar to http://jeamar.com/hand-winches/gw-wall-mount) for the on-stage electrics. My understanding is that these type of winches should never be used for this application, but I'm looking for specific reference for this. Just the...
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    Scaffolding questions

    Thank you all for the replies, especially Derek's reference to the OSHA regs. Hopefully this will provide ammunition to the administration as to why this is not a good solution. I agree that the Genie AWP-40S-AC plus the Super Straddle would be the ideal solution; we just need to convince...
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    Scaffolding questions

    The school system requires that any scaffold rental includes setup/teardown. Renting a scaffold to reach the motors was estimated at $5,000. Purchase price for what they are looking at is under $6,000, and can be used in other spots in the school with limited access. Keep in mind that the...
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    Scaffolding questions

    A local high school where I frequently help out is looking at purchasing some scaffolding, for two main purposes: 1. Access to their motorized fly system (motors are located about 45' above the stage, with no access provisions.) 2. Maintenance of houselights. They are looking at the...
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    Pressure on purchase line

    Basic Physics: Force = Mass x Acceleration. Translated as the more mass in the system, the more force will be required to get it moving. Keep in mind that in a single-purchase system every pound that you add to the batten adds 2 lbs. to the system; for double purchase you are adding 3 lbs...
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    Designer fees and state taxes

    Actually, having a credit on taxes paid makes sense... Think of it this way: let's say that you worked only in NYC, and as a result owe the state $5,000 in taxes, and the city another $5,000 based on whatever income and deductions you had. Now, let's say some of that income was earned in...