r/Rigging

Gimbal balance

Does anyone know how to balance a lab crane 3 gimbal? I have black magic cam

I am in Columbia and willing to compensate

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u/Final-Focus1115 — 18 hours ago

Diagonal tension lines

I’m looking for some equations to work out forces on a diagonal tension/traverse line. Fixed line with a load being lowered down, the load is anchored on a separate anchor point.

Can any one point me in the right direction? Cheers!

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u/EnglishFellow — 3 days ago
▲ 20 r/Rigging+3 crossposts

Inspection of a hook on an overhead crane

Good morning. I am an Overhead Crane Inspector at TRHON. I'd like to share this experience from a few years ago and get your opinion on it.

At a gas-fired power plant, on a new 25-ton overhead crane (the plant wasn't operational yet), a non-destructive testing was performed on the hook of the main trolley using dye penetrant testing.

The first indication that something was wrong was that the entire hook was painted. We proceeded to remove the paint, which took a considerable amount of time. We then discovered grinder marks on the hook. The marks weren't from leveling bumps; they were quite deep.

The dye penetrant was applied, and the result was that the hook had no cracks, so it could be certified. However, due to the grinder marks, I refused certification unless the hook manufacturer had issued documentation detailing the grinding marks and the reason for them. If such documentation existed, with the manufacturer's endorsement approving this anomaly, then I would proceed with certification.

The hook documentation did exist, but it didn't mention the marks, so I refused certification, which caused a major conflict with my client, who initially refused to pay for the service.

The client (a German company) initiated a traceability investigation with the overhead crane manufacturer (a Finnish company), which revealed that the hook left the factory in perfect condition. The problem lay with the company that assembled the equipment.

This was all resolved with a load test conducted by the client, which resulted in the hook being approved.

All of this resulted in a delay of more than eight months in payment for my services. My initial decision was to reject the hook due to anomalies that lacked justification and explanation. The client insisted that these anomalies appeared minor and wouldn't affect the equipment.

In the end, they issued a partial certificate only for the penetrant testing, contingent upon subsequent certification through a load test. What are your thoughts on this?

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u/camilograna — 7 days ago
▲ 32 r/Rigging

Can I hang a punching bag from this

I have a few of these threaded bolts sticking from the ceiling. They seem to have M8 thread on them and I was thinking I can buy one of those eye anchors, secure it with a normal bolt from above and a bolt with the anti-slip rubber from below and then use a carabiner to hang a punching bag on it.

How bad of an idea is that?

P.S. I don't have the bag yet, I wanted to figure out the mounting situation first.

u/Sify007 — 9 days ago

Hanging batting cage net

I’m trying to hang a batting cage net around the interior of the 50x50 total on my half, the full building is 100x50, office 20x12 /8x8 bathroom.1 multi piece I-beam in the middle of the space, I assume there is another behind the dividing wall. The walls are 8” purlin 14ga I think. I assume rafters are the same size. There is overlap of purlins across each ibeam. Horizontal purlins are 4ft, 7ft, 12ft, and 16ft at the roofline.The z-purlin has prefab holes in every piece on either side of the ibeam and against the outer wall. I was thinking about using 24” unistrut clamped to the center I ran to support a retractable net. I am struggling to come up with the least intrusive method possible to support 3/16th tensioned cable running from the outside of each bay door to the opposing side bay doors. The entire netting system would weigh no more than 500lbs total.

What’s the best way to attach/hang from the purlin and mount a brace for the turnbuckle on each end.

u/Pillaroftheplace — 7 days ago
▲ 31 r/Rigging

Is this right?

Was at a local event and noticed this. To my understanding shouldn’t it be choked on the bottom chord, not the top chord?

Side Note: I’m not concerned safety of this, was more so curious for my own knowledge/experience.

u/FaderMaster — 10 days ago
▲ 112 r/Rigging

AI Slop Rigging Diagram (for laughs)

Hi all, I’m a project manager at a large regional production company. I have IA training as a rigger, haven’t actively worked in that role in a decade but I try to keep my chops sharp. Thought you all might like a little entertainment on a Saturday. An agency client sent me this last night. “Ran your LED panel count through Gemini so I could diagram out rigging points, can you use this?” 😆💀

It reinforced why I absolutely never spend time under a suspended load at an event unless I know who hung it. Have fun everyone, be safe out there.

u/Cautious-Activity706 — 12 days ago

I want to hoist 100lb hay nets with a snatch block from this beam.

I’m thinking of putting an eye bolt either at the bottom or into the side. Is this a good idea or am I risking damage to the structure. The nets will be getting filled here, so highest working load will be impacted by if hay is getting dumped in by hand and for the raising to be loaded. I think the beam is 12x4 - I forgot to measure. Can update with measurement if it’s close. It’s a 15’ span between posts.

u/Doughymidget — 9 days ago
▲ 108 r/Rigging+1 crossposts

Maritime Tool?

Got this from someone who worked at a merchant marine academy. It’s pretty heavy, any ideas?

u/SaltyOldTimer — 12 days ago
▲ 16 r/Rigging+1 crossposts

Beginner Rigging Training Course

Does anyone have suggestions for any rigging courses for beginners? We are focused specifically on led screens, and want to start with all the basics.

Ideally something in person, but also open to online classes to go over some of the basic info, and then eventually going to an in person class separately.

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u/Large-Explorer-1796 — 10 days ago
▲ 13 r/Rigging

Ed Sheeran Steel/Shed Info?

Anybody in here work the Ed Sheeran loop tour? I'm trying to scope out what the shed is like but the LED wall and masking on the PA truss make it impossible to see what the steel is like behind it. They only have 10 upriggers called for it, which feels suspiciously light for a stadium tour. I managed to find one glimpse behind the wall and it doesn't seem like anything crazy is going on back there. Is it just a standard shed build? Anything funky about it or noteworthy?

It will only be my second time rigging in a shed, if I'm able to take the call, so I just wanna make sure I'm not out my depth. For context, my first rig in a shed was for the R&B tour (Usher/Chris Brown) and I did some climbing hand work for the SummerSlam show that just happened, so anything relatively close to those/regular truss shouldn't be too different/difficult. Any info on what the rig is like, number of points, motor sizes, etc. would be greatly appreciated! (Pics for reference/algorithms)

Thanks ahead of time for any info!

u/PresentationIcy5683 — 13 days ago

Best way to rig a 20kg kinetic sculpture from warehouse pulling?

*Title Edit* - Warehouse ceiling purlins.

We have a 20kg kinetic sculpture that needs occasional raising and lowering. Could one electric hoist lift its upper steel ring using a three-leg bridle?

We’d remove the existing light and ideally position the hoist there. The roof has light-gauge C/Z purlins with anti-sag rods. We know the rods, lamp bracket and roof sheeting aren’t lifting points.

Would a purpose-built trimmer spanning several purlins be appropriate, or should the load be taken back to the primary portal frame?

Any help or ideas are welcome!

u/Ozzzy_M — 14 days ago

Looking for an affordable alternative to Vectorworks Spotlight for truss & load calculations

Hey !!!

I'm currently looking for software recommendations to handle weight and load calculations for stage structures (truss loads rigging points weight distribution etc...) to make sure everything is safe

I already looked into Vectorworks Spotlight (and Braceworks) but it's way too expensive for my current budget I really can't afford to drop $100+ a month on a license right now

Does anyone know of any good more affordable alternatives that get the job done for calculating truss loads and rigging safety?

Thanks in advance for any tips !!!!!

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u/MedicalBodybuilder36 — 13 days ago

Bechtel rigging assessment

When I started with them a couple years ago, there wasn’t any kind of rigging assessment or hands on test prior to getting hired on as a rigger. Now, they have all new hires do this new assessment.

I was wondering if anyone knows what they want you to do/show. Like if you have recently gotten hired and done the hands on or know someone who might have an idea.

Just looking for a heads up on what to expect. Thanks in advance to anyone that can help

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u/Crittersnatch — 12 days ago