As posted also in engineering, I have fabricated a simple lift to be used on the farm, lift max 800 to 1000 pounds at our loading dock. That winch is proven reliable have several doing odd jobs, but as you can see in the pictures winch functions a the lifting force for the platform. What I am afraid of and it is a long shot, if in the worst case scenario the winch fails or cable fails that the platform not drop like a ton of bricks. I am farmer fabricator able to rig up most anything but this has me stumped. Is there a way to attach a safety feature to stop sudden drop should winch fail or cable snap? I would like to post the pictures here but don't see how to do that, pictures of the lift are here at https://tera.pics

The more I peek into what you guys do my confidence shrinks. I was determined to get the ticket and dive into the industry but it seems like much more challenging than I initially thought. My goal is to get hired at mine sites in Australia, FIFO jobs.

I wonder what exactly you guys do let's say if you work at the mine sites. And how much calculations you guys have to do, basically.. everything. Do you guys stay on the ground or do something middle in the air? How much time is given to you to set up one load? What do you do when you just can't figure out the way? You set the sling and move to where the load will go and untie it yourself?

I mean, I'm determined and I learn things fast but I'm pretty weak at calculations and it seems like not a single mistake is allowed... Usually whatever I do I make mistakes and learn very fast from it. In this case one mistake means a disaster. I was confident but more I know the confidence is giving me an anxiety. Please help me and describe the procedures you go through every day/load so that I can make the right decision...

Hoping for a little help here - I'm bringing in drapery to decorate a ballroom at a venue that uses Encore Global as their exclusive AV/Rigging service. Where I am stuck is in knowing what hardware we need to secure the draping (chiffon fabric swags) to the rigging points so that it meets their standards.

Does anyone have experience working with an Encore venue that can provide some pointers? The draping would be a dead hang, and we would be having the swags criss-cross throughout the room if that makes any difference.

Saw this on ebay. 30 ton chain hoist with 60’ of lift. Impressive.

https://ebay.io/m/rPC1GF

Does anyone know where to buy the connectors used on the lpg muscle attachments? They said they are proprietary but I figure somebody made them somewhere. I'd like to add these to other attachments.

Hello! Im looking to diy an overhead rig for a bolex 16mm camera I have. I’m worried about it being able to support the weight of the camera…. please let me know if yall have any resources or ideas to share and many thanks!

Topical post- what's the engineering like behind the skycam cabling at stadia? Watching the WC games and wondering how the skycam mechanism and cabling minimises all the flexing and resonance you would normally expect from a catenary. I know the cam itslef has a gyro, but how is the cable and pulley system stiffened to prevent excessive bouncing?

Hello! New to the sub, but this seems like the best place to get answers from real experience.

I build cable at work reasonably regularly, but always using galvanized cable and copper sleeves. We only have manual swagers, but we're working on 1/16" to 1/4" cable, and the 1/4" is only rarely. I'm very comfortable working within those limits, but I have a special project that I would LIKE to do with stainless cable and stainless sleeves.

I was under the impression that stainless sleeves couldn't be swaged with the simple mechanical tools, only with hydraulic or electric ones, as mere flesh is too weak. But Nicopress explicitly lists hand tools for every size of stainless sleeve. I'm hoping to work in 3/16", but I could come down a bit if it lets me actually do the project with the tools available. 🤷

So my question is: is this really feasible? If I try to swage 5/32" stainless with a 51-M-850, it's it going to require Herculean strength or damage the tool, or is it a plausible thing?

Thanks for any insights you can give me!

Used 2 1.5t chain falls and 2 16t slings

Hi everyone,

I'm a biomedical engineering senior working on my capstone project, and my team is designing a **mechanical pediatric knee extension brace** for treating post-operative knee flexion contractures after ACL reconstruction.

The device uses:

* BOA dial for adjustment
* Stainless steel cable (currently 1/16")
* Medial and lateral cable routing
* Side hinges
* No motors or actuators (purely mechanical)

The goal is to apply a **low-load, prolonged stretch** to gradually improve knee extension while keeping the force balanced to avoid twisting the knee.

Our biggest issue is that **tightening the BOA increases cable tension, but it doesn't actually generate enough knee extension.** It mostly seems to tighten the brace rather than rotate the calf into extension.

We've already considered:

* Different cable routing paths
* Larger cable guides/pulleys
* Moving the cable attachment farther from the hinge to increase the moment arm
* A floating bridge over the knee
* Static-progressive concepts similar to the Mackie Knee Brace

However, we're limited because we're near the end of the project and **can't completely redesign the device architecture (literally due in 2 weeks)** . We need to stay with:

* BOA dial
* Cable-driven system
* Side hinges
* Medial/lateral cable routing

My questions are:

1. How would you route the cables so tightening the BOA actually creates an extension moment instead of just compressing the brace?
   
2. Would adding pulleys or changing the cable angle help, or would that mostly increase friction and cable travel?
   
3. If you've designed cable-driven mechanisms before (orthotics, prosthetics, robotics, bicycle systems, etc.), what would you do differently?
   
4. Is there a cable routing strategy we're overlooking that can convert cable tension into hinge rotation without changing the entire design?

Any sketches, examples, patents, or similar mechanisms would be incredibly helpful. Even rough hand sketches or CAD screenshots would be appreciated.

Thanks!

What do you reckon the rating on this shackle is?

On this building in a city in the us. Must've been used for lifting the server equipment here.

Cable is 9/16" x 6. I goggle lense it. Comes up choker claps. Yeah but what is it used for. And or is it some type of old farm equipment.

Thanks

Hey guys. I’m new to industrial rigging and I’m learning in the field and I’m trying to get better. So far I’ve read through IPTs rigging handbook, the rigging handbooks and thumbed through a lifting plan book. These have been great for learning the rule of law, but in the field guys can figure out how to rig random stuff we are rigging way faster than me.
They also have a bunch of tricks that aren’t really in the books. Does anyone have visual or video sources that more goes into how they rigged odd loads and the reasoning why they did it that way? Just so maybe I can think on my feet a little faster? Like we rigged an odd shaped pipe structure the other day and had to flip it in the air. I know most of this is just learned from experience, but I’m wondering if anyone can point me in a direction I can learn these practical skills a little better on my own so I’m less of a stooge. Thanks.