DaFokka

Wow, that looks good. It might have both the torque and precision required for the Ballkirk Wheel!

Wow, that's a lovely module! It would be interesting to find out if this solution could generate the torque and precision needed for the ballkirk wheel.

I love it! The water feeder is my favourite detail ;).

Hey Doug! I have tried using a retarding mechanism with clutch but I did not succeed in creating a version with a good timing and smoothness so I'm really interested in your progress!

Even if I search by number, the rim is missing; at least on my PC. Must be a bug or something

Thanks for the compliments, guys! I spent quite a lot of time finetuning the module and I had a lot of fun! The real challenge is in making it reliable. Now I am working on a module that can create worst-case bunches of 30 balls at once for more rigorous testing of modules. I'll call it the Tsunami. The tire (50591) is available, but the rim isn't. Might be a bug, there are more parts missing (like the PF L motor for instance).

The Ballkirk Wheel is a GBC based on the Falkirk Wheel ship lift near Falkirk, Scotland. If you want to see it in action, go straight to the video: Conception I love the concept of GBC and I wanted to build an original GBC module. Ten years ago I got the idea of using the Falkirk wheel. Its continuous mechanism should be just as good at lifting balls as it is at is at lifting ships. Unfortunately back then the inner hole of a large turntable was not large enough to accommodate a 14mm ball plus lane. The only alternative was to use Hailfire Droid wheels but since I was not quite ready to sell a kidney to support my hobby, I dropped the idea. Fast forward ten years and I revisited the idea. @jojoguy10 built a LEGO version of the Falkirk wheel, but noone had made a GBC module out of it yet. The new large studless turntables have no gears in the centre hole, which means that it's (just) large enough to fit through a lane with balls. So I ordered six of them from Bricklink and started building. Building Process When prototyping I tend to use a mix of colors. This limits search time and makes it easier to discern individual bricks. Once a module is finalised, I recreate it in Stud.io so I know how to rebuild it when my BrickLink orders arrive. This is the first time I used a CAD program during the building process. I had no experience with MLCad or LDD and I started out with the newest kid on the block, Stud.io. There are still a few kinks to iron out but I think Stud.io has a great balance of simplicity and power. Gondola orientation The orienting mechanism makes sure that both gondolas stay upright during the entire rotation. This prevents balls and boats from being spilled. The principle is demonstrated by this video: LEGO was actually used by the designers to demonstrate the mechanism for the Fallkirk Wheel. My implementation is very straightforward. The center turntable gear stays stationary. As the wheel revolves, the smaller gears between the center turntable and the outer turntables cancel out the rotation of the gondola, thus keeping it upright: Retarding Mechanism The most challenging part of the build was the intermittent rotation mechanism. The wheel needs to pause shortly to load and unload the balls. Initially, I wanted to use a mechanical solution for this. I have experimented with many different solutions, none of them satisfactory. I started out using a rotating cam that would temporarily block the rotation of the wheel. This did work but it was very imprecise and jerky: In movie projectors and watches something called a Geneva Drive is used, but I did not succeed in creating a version with sufficient angular precision to reliable loading of the balls. Another possibility involves a sliding mechanism on a piston driver, thus first converting rotating motion into intermittent linear motion and then back to intermittent rotating motion. Although motion was smoother than with the cam mechanism or the Geneva drive, it was even less precise and more bulky. Eventually I caved and just used a Mindstorms NXT to drive the wheel. The program is exceedingly simple: Rotate 900 degrees at 80% power Wait for 1500ms Repeat I'd be really interested if someone comes up with a mechanical mechanism, because using software to solve this issue feels like cheating to me. Loading Hopper Since the mechanism completes one cycle every three seconds, on average three balls should be lifted during each cycle to comply with the capacity of 1 ball per second which is required by the standard. For this, a pusher is located at the bottom of the hopper like in Akiyuki's Ball Cleaner. For the mechanism, I took my inspiration from @Lasse D's ball pump. A counterweight on the back of the hopper smooths pusher movement. I currently feel the pusher is the weak point in the contraption. Because it is driven by the same motor as the wheel, it spends half the time not loading any balls, thus limiting capacity. Since 5 balls fit on the piston simultaneously, theoretical maximum capacity is 1.66 balls per second. But when multiple balls are stacked in the hopper, the pusher loads less balls per cycle, limiting capacity. One solution would be to use a second motor to continuously drive the pusher but I prefer the contraption to be driven by a single motor. Controlling Ball Flow The balls move through the wheel because the entire assembly is tilted. The incline is 1 brick per 15 studs, or 1 plate per 5 studs. This corresponds to an angle of 8% or about 5°. The balls should only move when the wheel runs are oriented with the input and output runs. For this both the input run and the gondola runs are equipped with gates that are closed when the wheel is in transit: As usual, the simplest solution turned out to be the most reliable. A sliding gate is held town by gravity. The input gate is opened by two 42610c02 wheels [LINK] mounted at the end of the arms, which sadly are not available in Stud.IO. The output gates are opened by the gears of the orienting mechanism, as illustrated in the following image: Reliability The biggest challenge of a GBC is making it reliable. Those little balls have a mind of their own and tend to find every nook and cranny of your contraption to escape it, jam it or even break it altogether. I tested the contraption with beads with large holes which get stuck easier than the standard balls. The Ballkirk Wheel has gone through several revisions to improve reliability: Incread the incline to prevent balls from stopping in the middle of a run Like 7 versions of the input and output gates Enlarged the hopper and the pusher for greater capacity Several modifications to the pusher to reduce friction and increase reliability Addition of a counterweight to the pusher for smoother operation Added a shield to prevent ball spillage at the exit lane Added a bumper at the foot of the back support to push back balls that have missed the exit Together, these improvements have resulted in a fairly reliable GBC. I have tested the Ballkirk Wheel for an hour of continuous operation with no blockages and only one ball spilled. Maximum throughput is about 1.4 balls per second. Summary Thanks for reading this far, I hope you enjoyed it! Please let me know what you think! I haven't gotten around to creating instructions and I'm not sure I ever will. However, if you'd like to recreate this contraption, you can download the stud.io file: Ballkirk Wheel.io - Stud.io file.

Although my remarks were prompted just as much by the fact the only two posts from his account were demands for the building instructions, I should have thought twice before posting.

If it ain't dangerous for your feet, it ain't LEGO.

If you ever had the ambition of creating a Lepin set, it seems like this is your chance! ;) Excellent model by the way, have you every considered building the 6x6 version?

I supported your idea, fingers crossed!

If money wasn't an issue, I'd go for the 42055 Bucket Wheel Excavator since it's a much bigger set. However, if you do consider price I think you should go for the 42053 Volvo EW160E: It has a respectable amount of functionality: steering slewing front outrigger/shield rear outriggers arm elevation arm extension bucket opening/closing Many Technic sets are gear boxes with wheels. In contrast, this set only has 6 gears. Most of the functionality is provided by pneumatics and/or linkages. This is an interesting change It just looks great

Hear hear! I'm not overly excited about the 42070 but I think for the target audience, it's a great set. It has everything: Remote operated Gear box to change functions Playability Versatile parts selection How much I like and prefer the previous flagships, the last one to feature all of these features is the venerable 8043. This set surely has a place in the current line-up. I think the mechanisms are nothing to sneeze at. There's a gear box, two functions passing through a turntable and the outriggers are clever. This is exactly the type of set I would have loved to have as a 12 year old. We have to remember that basically our hobby is subsidised by parents buying gifts for their children. I didn't do the market research but I assume (hope) LEGO did and I can totally see this set being a success. The price is hefty but I'll bet you good money there is quite some room to lower the price and you''ll be able to pick it up for $230 at some point. I'll probably not buy this set but I'm definitely rooting for it.

Awesome, you did indeed! Congratulations, bugs like these can be a real pain in the behind to track down!

I am considering a bot which fires a 'grapeshot' of 1x1 round plates to jam the mechanisms of the opponent.

The steam boat of sinterklaas?

Oops, I actually meant 1 brick per 16 studs, so that is 3 plates per 16 studs. I use the sloped tiles too, they look really nice.

Thanks! I am working on a module with a 1 plate drop per 16 studs, which would seem to be enough. Single balls never manage to stay put with this angle. However, if there are multiple balls in single file become stationary, the angle alone is not enough to get them moving again. I am currently testing with 14mm beads which have fairly small holes so I'm hoping the Quercetti marbles I've just received will perform better.

The dutch web shop internet toys currently has 14mm Quercetti marbles on sale for €4,95 for a pack of 100: https://www.internet-toys.com/141827-quercetti-aanvuldoos-knikkers-diameter-14-mm-100-delig/

What is the minimum angle for a slope so that balls will never stop on it?

Yes, this is fairly realistic, you have them a lot on the Rhine:

Wow, I can imagine that must be a pain to get to work reliably. Thanks for not putting any music under the video!

Awesome, I love how you explained the mechanism with some small mockups! Did you use the XL motor because it does not need gearing down to achieve the correct amount of RPM? Or is its power actually necessary for the mechanism to operate?

Maybe the contents of the box are manufactured in a different plant?

There might be plenty of reasons. For instance: It might be a loss leader. I do get @Sariel's frustration, it looks like some people expect LEGO to operate like a charity. They won't and neither should they be expected to; they are a for profit company. Edit: Another awesome review by the way, keep up the good work!