Congresstech Posted March 8, 2009 Share Posted March 8, 2009 Hi all, Due to a problem with the noise boys flying speakers in every possible point for an upcoming production, I have had to consider the possibility of rigging a Robe 575 colour wash from a 2M piece of steel scaff, which itself is rigged at 90deg vertical from another piece of scaff which in-turn is secured off 4 points across 4 RSJ's. Taking into consideration the weight of the fixture, vibration and heat, will the clamps supplied with the fixture be suitable for rigging side on? And if so, will any secondary securing be required? Your thoughts are much appreciated. Mike Link to comment Share on other sites More sharing options...
jonathanhill Posted March 8, 2009 Share Posted March 8, 2009 Can you blag a gallows type de-rig from the afore-mentioned sound boys to rig the unit, base horizontal? Otherwise someone is going to have to be very strong to hold the unit while it is mounted base vertical. Link to comment Share on other sites More sharing options...
Congresstech Posted March 8, 2009 Author Share Posted March 8, 2009 It looks like my strength will be coming into play yet again then!, not made any easier by the fact the scaff is 4M from floor level! Link to comment Share on other sites More sharing options...
dunk_1984 Posted March 8, 2009 Share Posted March 8, 2009 What clamps are supplied, if you are hiring them ask the hire company to supply the mounts with half couplers. Link to comment Share on other sites More sharing options...
Seano Posted March 8, 2009 Share Posted March 8, 2009 You don't mention what exactly the 'clamps supplied with the fixture' are. Half couplers - yes, hook clamps - no, something else - maybe. The boom arm/de-rig arm may be a good idea. What does a Robe 575 weigh, about 30kgs? A 2' bit of scaff and a 90degree clamp may suffice. If great strength comes into play, you're doing it wrong. Apologies if I'm stating the bleedin' obvious, but you really shouldn't be carrying the unit up a ladder or attempting to hold it while you nip up the clamps. However you decide to rig it, better to chuck a pulley on the bar above and have an assistant (glamorous or otherwise) rope it up from the floor. Link to comment Share on other sites More sharing options...
jonathanhill Posted March 8, 2009 Share Posted March 8, 2009 I carry a couple of Petzl pulleys for making a double purchase arrangement for such prosc/mover fun. And we also blag gallows de-rigs although a 750mm de-rig will be fine. I would definately look at solution that does not involve a base vertical scenario as it is always tedious, nay dangerous. Link to comment Share on other sites More sharing options...
Congresstech Posted March 8, 2009 Author Share Posted March 8, 2009 Its no problem stating the obvious, its being roped up by my not so glamourous assistants, and I'll be on a genie lift anyway. Last time I had them in off the supplier they came with hook clamps (Sorry for not pointing that out in the OP) but I will ring them at some point and ask for half couplers. Thanks for the advice chaps, and if the worst comes to worst, I'll move the speakers when they aren't looking. Link to comment Share on other sites More sharing options...
flypig Posted March 8, 2009 Share Posted March 8, 2009 Enough (and very intelligent things) said by others. However, it is always good practice to fit an additional fitting (clamp) as a stop/safety to any vertical 'Butt tube' that is suspending and/or supporting a load. Safety fittings should go above the topmost fitting on the vertical butt tube, and below the lower fitting of any load attached/suspended from it. IH A concurrent post has been automatically merged from this point on. Jonathan. Please excuse a stupid question, but what exactly is a "gallows type de-rig"? Any pictures? IH Link to comment Share on other sites More sharing options...
jimbo7744 Posted March 9, 2009 Share Posted March 9, 2009 Enough (and very intelligent things) said by others. However, it is always good practice to fit an additional fitting (clamp) as a stop/safety to any vertical 'Butt tube' that is suspending and/or supporting a load. Safety fittings should go above the topmost fitting on the vertical butt tube, and below the lower fitting of any load attached/suspended from it. IH A concurrent post has been automatically merged from this point on. Jonathan. Please excuse a stupid question, but what exactly is a "gallows type de-rig"? Any pictures? IH This is a basic de-rig arm (not permanent or welded to the vertical) http://www.stage-electrics.co.uk/productHire.aspx?code=BAD1and a gallows de-rig arm would be the same, but with a 45 degree support to strengthen the horizontal bar Jimbo Link to comment Share on other sites More sharing options...
Joe Betts Posted March 13, 2009 Share Posted March 13, 2009 "and a gallows de-rig arm would be the same, but with a 45 degree support to strengthen the horizontal bar" Thats basically just a canteleiver with a diagonal brace off the vertical scaff bar. Link to comment Share on other sites More sharing options...
Trunker Posted March 23, 2009 Share Posted March 23, 2009 Hi Mike, Get in touch with Jason at the Muni in Pontypridd. He has his rigging certs and my be able to give you some advice or may be able to come over and have a look. PM me if you want his number. Matt Link to comment Share on other sites More sharing options...
Ynot Posted March 23, 2009 Share Posted March 23, 2009 Get in touch with Jason at the Muni in Pontypridd. He has his rigging certs and my be able to give you some advice or may be able to come over and have a look. PM me if you want his number.Fer crying out loud!This is nowhere NEAR rocket science!All the OP needs is what's been suggested already.A standard de-rig arm should be more than man enough for the job, but if the OP has concerns then a gallows type will belt and brace the job. There is absolutely NO need to involve anyone with 'rigger's certs' - other than to maybe check the loading on the barrels involved. Link to comment Share on other sites More sharing options...
Trunker Posted March 24, 2009 Share Posted March 24, 2009 Get in touch with Jason at the Muni in Pontypridd. He has his rigging certs and my be able to give you some advice or may be able to come over and have a look. PM me if you want his number.Fer crying out loud!This is nowhere NEAR rocket science!All the OP needs is what's been suggested already.A standard de-rig arm should be more than man enough for the job, but if the OP has concerns then a gallows type will belt and brace the job. There is absolutely NO need to involve anyone with 'rigger's certs' - other than to maybe check the loading on the barrels involved. For Fceks sake!!!!! If you are unsure you ask then get someone in to check. What would happen YNOT, if the mover fell on someone's head? The OP was asking for help and rightly so. There is someone who loves 10 miles away from the op who has worked on the big scale, i.e. stadium tours for international artists/bands, who does this thing all the time. I was offering a solution to get a second opinion and another visual check to say yes or no. Link to comment Share on other sites More sharing options...
Ynot Posted March 24, 2009 Share Posted March 24, 2009 For Fceks sake!!!!! If you are unsure you ask then get someone in to check. What would happen YNOT, if the mover fell on someone's head? The OP was asking for help and rightly so. There is someone who loves 10 miles away from the op who has worked on the big scale, i.e. stadium tours for international artists/bands, who does this thing all the time. I was offering a solution to get a second opinion and another visual check to say yes or no.Well, from the OP's OP, ...from a 2M piece of steel scaff, which itself is rigged at 90deg vertical from another piece of scaff which in-turn is secured off 4 points across 4 RSJ's. that suggests there may be little doubt that the scaff is securely affixed and capable of holding the extended bar. OF COURSE if he's so inexperienced as to not have judgement enough for this, then yes - get someone in. But for a single luminaire, fixed as has been suggested above, with good secondary bonding there should be no problems! Link to comment Share on other sites More sharing options...
jimbo7744 Posted March 24, 2009 Share Posted March 24, 2009 To be fair Ynot, the OP is suggesting mounting a 30.5 kg plus rigging gear moving head fixture, not something like a Source 4 or a heavier 13 kg Cantata profile (not that a S4 or Cantata couldn't harm or maim someone if it dropped.) Trunker only suggested someone locally who could say yes or no if the OP was still unsure that the 90deg vertical from another piece of scaff was sufficiently capable of supporting the load via either a de-rig arm or a gallows type de-rig arm. If the OP was unsure if it was possible to hang this fixture from their existing point, then a suggestion of someone to "sign it off" should be recommended not berated? Jimbo Link to comment Share on other sites More sharing options...
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