mdemerchant

Nice job. It should be more accessible in this size for more people to build. You even have a tiny operators cab. You are missing the box for the chain to pile into though. Do they use that on all the sizes of SK cranes or only the biggest ones?

I'm fine with a big model costing more than that. But I think it probably strongly depends what kind of MOCs you buy and why. In my case, the ones I buy are almost always fairly large/complex things I want for display pieces in which case I'm going to order typically hundreds of dollars of parts for them anyway so the instruction cost is not that significant. But if you are looking to buy MOCs just for something to build with your parts you have then I can see you will be more concerned about the price. I rarely do that because if I just want to build something I'll just build something myself most of the time.

Wow, all of the examples all of you gave are very reasonably priced and so few takers. @M_longer, your Volvo is a great model and it got plenty of views, around 4500. I'm shocked it has so few purchases. I have only a couple of free MOCs posted and they both have thousands of downloads, one has nearly 14000. Around half the people that view them download them, versus less than 0.5% for the Volvo. I was quite sure that having a price versus free will obviously greatly reduce the number of people who get the model but I never would have imagined it could be by 100x and for one of the most popular MOCers on Rebrickable. I wonder what happens if you just charge some nominal amount like 1 euro. Maybe there's a magic price point that can drive volume, even though it seems unreasonably low given the quality/complexity of the MOC.

This is an interesting point. What is the actual mechanism by which you get paid through Rebrickable? I have only posted a couple of MOCs for free so I never really thought about it. But I always assumed money would get directed to you minus some sorts of fees from RB and whoever else may be involved in handling the payment so you collect less per sale than the listed sale price. But your comment kind of implies you have some fixed overhead cost just from being setup to sell MOCs. If you run you own website I get it but does RB work that way?

Your question kind of got lost in the other discussions but here is my two cents. The gearing is probably the major problem with responsiveness, not the U-joints. Consider that 270 degree rotation of the worm gear will only turn the 16T gear 3/4 of a tooth. This magnifies all the slack in the system and is going to make the steering super slow even with no slack at all. You will be much better off to find a more direct routing of the steering and use closer to 1:1 gearing assuming this is a non-RC model. If you really can't avoid sending the steering sideways it would be better to use a chain or even a bunch of 16T gears in a row rather than sticking in a worm gear to turn the transmission axis and U-joints to turn it back. If you really, really have the turn the axis then use some bevel gears instead of the worm gear.

This looks great, really well done. I like that it has a few functions that are beyond the standard 4 function loader. My current project also happens to be a loader but I can safely say it's unlikely to look nearly as impressive as this one.

Yes, it is too wide for scale by quite a bit. Those tires look good but from the video they seem really soft. Do you think they will be able to support heavy models like this or your Grove? I guess the weight is distributed over a lot of tires, maybe ok. I did not make a video originally and my crane has been disassembled for a few years so I can't make one easily now. @seregiz and @nigel1975 both took some awesome photos of theirs but told me it was too large for them to easily make videos.

They are certainly going to make the build much quicker which is good if you are the sort that really gets bothered by repetitive building. I think the resulting structure is probably also a fair bit stronger than most built up 7x7 lattice booms, mainly because they have cross bracing in both directions where most people build those booms with two flat lattices just connected by axles so they are flimsy in one axis. I don't have the parts though so can't say for sure but in looking at how they are assembled they must be stronger. I think the main limitation is they only work well for a 7x7 cross section. If that's what you need for your crane, great, but if you are interested in making something closer to scale most cranes don't have booms with square cross sections and don't use a fixed cross section for boom, jib and derrick. So I don't think the parts are as flexible in their application as they ideally would have been.

Great choice but that's the one PU set I own so I don't need a conversion Although I did convert it to C+ full RC after I was done playing with my 42100. Unfortunately I don't have a complete design file for it or I would post it. Doing the conversion of the original set should be pretty straightforward, only one motor to deal with and it's got space. Now I feel like building Big Red again... such a good set.

No, actually I find it easier to thread through things because it's thinner but stiffer. It's not really that prone to tangling, just more so than the Lego string which is nearly impossible to tangle. If you throw several meters of the Kevlar in a heap on the floor and then wind it up you are likely to come across a small tangle while winding but it isn't prone to tying itself in real knots.

It's also just using the tilt reading from the hub but the linkage makes the hub tilt more than the rest of the superstructure does. The control may be slightly more complicated/less good with the load sensor because you can't just control it to have zero tilt. You probably need to have just open loop control based on the sensor reading and some math. But if you just put the hub in the superstructure and use tilt I'd be worried about it having very little precision and the counterweight position constantly hunting all over the place. I guess you can put some coding in the control loop to minimize that.

In theory this would be easy to do using just the tilt of the superstructure but I'm not sure the hubs have enough angle precision to make it work well. You could also do it with something like the load sensor mechanism the model already has which may work better. I don't think the V frame is actually available for the LR13000 if you're going for realism but it will look cool and be fun to build so go for it and show us photos I was actually thinking of building an LR11000 as a future project mainly to do the V frame.

Personally I use 100 pound or 200 pound braided kevlar usually for my cranes, get it from Amazon. https://www.amazon.ca/gp/product/B089SGWBT5/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1&psc=1 It's strong and not stretchy and much thinner than Lego string so I can pack much longer lengths onto a given size winch. But it's not as soft as Lego string and can get more tangled. Not sure what kind Seregiz used when he built it. I know lots of people sell braided nylon on Amazon, any of those should be very similar to Lego string if you prefer that. All are cheap, even kevlar. You probably need about 20-25m for this crane. Well people here have already seen it so I don't expect a ton of comments, just wanted to make people aware of @seregiz's awesome instructions. It's getting plenty of attention on Rebrickable, a lot of downloads in just a few days. I'm surprised so many people would consider building such a big MOC.

Sorry to bump this but I'm pleased to report that @seregiz has made instructions for this and a cleaned up Stud.io file. Plus he took a ton of great photos. Now available on Rebrickable and Bricksafe, free of charge. I contributed a Stud.io file for the luffing jib and 3rd winch for anyone adventurous but I didn't do instructions for them, they are simple enough to build. https://rebrickable.com/mocs/MOC-169020/mdemerchant/liebherr-ltm-11200-mobile-crane/ https://bricksafe.com/pages/mdemerchant/ltm11200

When I saw Mobile penguin washing station I had to click it and I was rewarded. This is awesome, very nice build besides being an entertaining concept.