lindr6

Introduction: For this contest, I wanted to model a piece of hydraulic equipment that uses a manual pumping action to manipulate the hydraulics. This would give the Technic model a natural look and feel when using the manual hand pump to activate the pneumatic cylinder(s). After much thought and searching, I landed on a hydraulic scissor lift cart. This piece of equipment will require the three main components of the Technic pneumatics system, should be compact requiring interesting mechanisms utilizing the pneumatics, and has a added bonus of being something that is rarely modeled (are there any others?) hopefully making this contest entry slightly unique! Here are some pictures I will use for my inspiration: Plan: I plan to break this model into four distinct builds: General Frame, including caster wheels and handle bar for pushing cart. Scissor lift mechanism to raise and lower the cart table using a pneumatic cylinder. Foot pump mechanism that uses the manual pneumatic hand pump to cause the pneumatic cylinder to extract. Hand brake lever mechanism that moves the pneumatic switch to cause the pneumatic cylinder to retract (based on gravity, not air pressure). Anticipated Challenges: Keeping the mechanics of all the pneumatics into a low profile so that the cart table is a low as possible when all the way down. The sliding mechanism of the scissor lift. I am not sure how to best model this and keep everything stable and strong. Translating the vertical foot pump action to a horizontal stroke that is strong and long enough to depress the pneumatic hand pump while keeping it low profile. Operating the pneumatic switch located in the cart base via a lever on the handle bar. I am currently thinking that this might be good use of the flex system! Issue here will be having enough travel to successfully move the switch far enough. Also need the mechanism to include a spring to return the lever back to initial position. Build: Part 1: General Frame Here is my initial prototype to set a standard for size and to use as a base for the different mechanisms. Part 2: Scissor Mechanism Part 3: Foot Pump Mechanism Part 3: Hand Lever Mechanism Final Model: Video:

5. Pneumatic Scissor Lift Cart Functions: Foot pedal pump action to extend the pneumatics, raising the table. Hand lever action to retract the pneumatics, lowering the table. Caster wheels (rears rotate 360 degrees) Discussion Topic And Many Pictures: HERE

Here is the video:

Unfortunately, the only other color I can go with based on my parts selection is yellow. I gave it a try and do not like the looks of it. I think I will stick with the all grey color scheme. Thanks for the comments!

Here is the model with the last mechanism integrated into it. Overall, the mechanism works great in the model. I was worried the hand lever would not work well, but it works perfect. I was also pleased that gravity is enough to allow the table to lower. I did change the handle bar up a little to better accommodate the hand lever, and make it look a little better (in my opinion). For anyone following this thread will see, I also refactored the entire model as I found that I could optimize things a bit now that I had all the components together and saw how everything was working. By doing this, I was able to work out the thickness of the cart to where I wanted! Now for the pictures: If anybody has comments/suggestions to round out this project, please share, as I plan to shoot a video in the next two or three days.

Here is my design for the mechanism for lowering the table via the pneumatic switch. The flex system cable will be routed up the handle bar and to a lever. I will iron that out once I integrate this mechanism. I decided to use spring to return the switch back to center and provide tension on the lever, as it seems a little more authentic than using a rubber band. Anyways, check out the pics: Next up is integrating this mechanism into the rest of the model. It should fit pretty easily as I already took my size/shape limitations into consideration.

I now have the pump mechanism integrated into the build. I had a little issue with the hose fitting on the pump interfering with the pneumatic cylinder. To accommodate, I had to move the pump forward a bit to make it all work out, so not a huge deal. Anyways, here are the pics: Next up is to build the mechanism for the hand lever to operate the pneumatic switch.

Here is the mechanism I came up with to depress the pneumatic pump with a "foot pedal". This was not easy to come up with a design that has enough stroke to full depress the pump via a rotational "foot pedal" action. Also, want to keep the design to 4(ish) studs in height. Width is also important so that it will fit between the cylinder and the scissor mechanism, which gives it only 2.5 studs width for most of the length of the pump. I'm still open to suggestions if anybody has a better solution to the problem. Another thing I had to consider is the strength of the mechanism, as when the cylinder is under load, it takes quite a bit of force to depress the pump. Anyways, here are the pics: Next up is to build this mechanism into the model!

I believe I have the basics of the scissor mechanism working with the pneumatic cylinder. I went ahead and integrated it with the frame since it really needed to be part of it to accommodate the sliding action as the lift goes up and down. Luckily, there is still plenty of room for the other mechanisms, so hopefully I can make them all fit without too much issue. The space below the table is a little thicker than I would like, as I was hoping to keep all the mechanisms below the table down to four studs, and I currently have five. I'm going to leave it as for now and can work to reduce it if possible at the end. In the real thing, there is quite a bit of space used for the mechanisms below the table, so I really do not think I am far off. Here are some pics of the progress:

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Here is my TC9 Entry. It is skid steer and front loader based on the real thing by JCB. A Model JCB Skid Steer: Functions: - Mini Linear Actuator Raise/Lower Boom - Manual Bucket Dump - Working Fake 3 Cylinder Diesel Engine - Four Wheel Drive (All wheels turn when any one wheel turns) - Left/Right wheels can turn in same or opposite directions to turn - Quick Detach Bucket Attachment Dimensions: - Length: 25 studs - Width: 11 studs - Height: 16 studs - Box Volume: 4400 studs B Model: JCB Front Loader: Functions: - Mini Linear Actuator To Raise/Lower Bucket - Manual Bucket Dump - Working Fake Three Cylinder Engine - Rear Wheel Drive With Differential - Rear Perpendicular Suspension - Articulated Steering Dimensions: - Length: 35 Studs - Width: 12 Studs - Height: 16 Studs - Box Volume: 6720 Studs Video: Parts left from A Model after building B Model:

14. JCB Skid Steer & Front Loader A Model: JCB Skid Steer: Functions: - Mini Linear Actuator Raise/Lower Boom - Manual Bucket Dump - Working Fake 3 Cylinder Diesel Engine - Four Wheel Drive (All wheels turn when any one wheel turns) - Left/Right wheels can turn in same or opposite directions to turn - Quick Detach Bucket Attachment Dimensions: - Length: 25 studs - Width: 11 studs - Height: 16 studs - Box Volume: 4400 studs B Model: JCB Front Loader: Functions: - Mini Linear Actuator To Raise/Lower Bucket - Manual Bucket Dump - Working Fake Three Cylinder Engine - Rear Wheel Drive With Differential - Rear Perpendicular Suspension - Articulated Steering Dimensions: - Length: 35 Studs - Width: 12 Studs - Height: 16 Studs - Box Volume: 6720 Studs Discussion Topic Link: http://www.eurobrick...howtopic=120641 Video of A & B Model: A Model: HxWxL: 16x11x25=4400 Studs No bounding box picture as model was disassembled prior to the requirement. B Model: HxWxL: 16x12x35=6720 Studs

Yay pics.... looks great!

What if the new IP car had some sort of new pneumatic 2.0 part that simulates disc brakes and/or a clutch. A new pneumatic part like this would likely drive some demand, even if the price is high, and possibly earn the 'ultimate' name.

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How about a walking machine? Has anybody here attempted to model something like this?

Grove Shuttlelift CD3339: (This is the 3340 version, not the 3339, but they are very similar) My inspiration for this little crane is that I see it working on a bridge crossing the Mississippi river on my commute to work. It is constantly busy lifting this and that down to the crews working below the road deck. The first time I saw this little crane, I instantly knew I wanted to model it in lego technic, so I added it to my list of MOCs to create. This contest was just what I needed to convince me to start the project. Here is my version of this little crane, in 1:10 scale: Here are the functions: 1 Servo motor for 4 wheel steering (also turns the steering wheel in the cabin). 1 XL motor powering the wheels. This thing is 4 wheel drive implemented using 3 differentials 1 Large motor for lowering the four stabilizers (one on each corner). 1 Medium motor for rotating the boom structure. 1 Large motor for raising/lowering the boom. 1 Medium motor for extending the boom. 1 Medium motor powering the winch to raise/lower the hook. 1 PF Lights used for headlights. More pictures and a video to come. I also plan to share some retrospective on this build.

Hopefully this picture helps. Basically having the really long axle run through the panel pieces to work a worm gear the extends the boom.

4. Grove Shuttlelift CD3339 Here are the functions: 1 Servo motor for 4 wheel steering (also turns the steering wheel in the cabin). 1 XL motor powering the wheels. This thing is 4 wheel drive implemented using 3 differentials 1 Large motor for lowering the four stabilizers (one on each corner). 1 Medium motor for rotating the boom structure. 1 Large motor for raising/lowering the boom. 1 Medium motor for extending the boom. 1 Medium motor powering the winch to raise/lower the hook. 1 PF Lights used for headlights. Discussion topic for additional information, pictures, and build retrospective: http://www.eurobrick...howtopic=116572 ​

Here is the video: Retrospective: This was the first crane MOC that I have attempted, and it had some unexpected successes and challenges. Using the big unimog wheels takes a lot more room than expected for all the steering sweep. I needed to keep the wheel arches close to the wheel to match the real crane, so there is a lot of empty space under the body, which left limited room for the motors and gearing. I knew the large turntable is not the most stable part, especially when a lot of weight is placed on it, but I did not expect to have to spend so much time balancing out the boom and counterweight to keep from having too much weight and lean on the turntable. The final version turned out well, and I assume the real crane has careful planning around this as well. A two stud wide outrigger that comes out at an angle that is capable of handling the weight of the entire model. It was tough to keep the mechanics and outrigger down to 2 studs wide (3 if you count the panel on one side), yet keep it strong. Only two studs were permitted because of the large tire sweep for the wheels. Clutch gears, it was tough to work in a clutch gears for all the different gear trains. That gear is just too big to fit nicely in any tight space. It would be great if Lego were to crate a smaller one. Anyways, I was able to work it in, just took much more effort than expected. Boom extension works great using the super long axle from the mobile crane going through all the panels. This allowed a more sleek boom that matched the real model, and prevented the need for an externally exposed axel. I'm happy with how this turned out. I was uncertain how the large LA would handle picking up the heavy boom when mounted at the angle as the real machine. To my surprise, it works great and I did not have any issue with it! I wanted to do a second steering mode for the crab steering, but as usual, time is not on my side, so this feature has not been implemented. This is an optional feature on the real model, so I am good with not adding it, but would have been nice. I should have started with it implemented as I developed the steering and drive mechanics of the model, instead of skipping it so that I could be sure to have plenty of time to work out any problems with the rest of the model. Perhaps I will continue to work on the model after this contest to work it in. I wanted to have full 360 degree rotation of the boom, and not worry about wires, gear, and hoses getting tangled up, but I also wanted just one battery box to keep the model as light as possible. At the end of the day, I ended up using the two battery boxes, one in the boom counterweight, and one in the body. This arrangement allows the freedom of unlimited 360 degree rotation, which was of a higher priority than saving weight. This also simplified all the gearing and whatnot needed to make all the functions work remotely. I wanted to work in a fake inline 4 cylinder engine into the model. I just could not find/make the room to work it in. The wheel sweep is just too large to allow room for it. If I were to completely redesign the model there might be a chance to work it in, but as usual, the time factor is just not on my side for this. Again, this might be something I try to add if I continue to work on the model. Thanks for any comments on the model, it was a lot of fun to create. I'd also like to thank the organizers of TC8, as if it were not for this contest to motivate me, this model would still just be on my list of things to MOC.

Here are some additional pictures I snapped:

This model was not built with the intention to match the ability of the real version, but to match the functions and overall look. I actual spent a lot of time to balance the boom and counterweight on top of the turntable so that it stays pretty balanced with varying boom heights and extension. With that said, I was testing by lifting a battery box which it handles with ease.

How cool would lego rotary engine be in the RX-8! No rotor, no motor!

Here is my work in progress entry for tc6. I just want to start by saying that I have recently resurrected my old technic collection and looking to get back into the hobby. I saw this contest, so ordered up some pf parts, and the fun began. All my sets are the old studded sets, so I hope this does not hurt my chances! Back when I did MOCs (20 years ago) similar models to this were my favorite, but I was never able to motorized till now! Functions: - 1 Servo Motor: Steering - 1 Large Motor: Rear Wheels - 1 Medium Motor: Dump Bed (small LA) - 1 Medium Motor: Switch Headlights On/Off (a wimpy function, but my kids love it) - 2 IR receivers as I do not have an s-brick. Other Features - Limited slip rear differential - Live rear axle suspension - Perpendicular front axle with steering - Steering wheel turns with servo motor - Hopefully more to come! Looking to add some doors, but not sure how to best do this using my old parts, which I am almost out of. Any suggestions on this would be welcome. Also, please share any improvements and or features I should add, as comments are welcome, especially since I have not done a MOC in many years so my techniques are probably out of date.

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