Heppu

I also did not realise the first image was a video. The functionality looks pretty nice already! The inverse kinemattics I dont feel are complicated at least for the 3 degrees of freedom robot being built here. Maybe for the 6-DOF ones like in the video linked by oracid it starts to get complex. For 3-DOF you just need to adjust the relative speeds at which each of the 3 motors turn to have each motor reach the desired angle at the same time.Trajectory generator is required for longer movements to generate "middle points" or otherwise some inverse kinematics solutions that have the end effector travel trough the x-y origin between 2 far away points can lead to the end effector not maintaining linear movement between the points. Here are some pics and videos of my attempts at 3-DOF Delta robots if interested for inspiration https://www.flickr.com/photos/heppu/albums/72157704649606362/.

Always cool to see delta robots and robotics projects in general! I have such a fondness to having built a few of delta-robots with Mindstorms myself. Excited to see your progress and final application with this. I'm unfamiliar with the motors you are using, but if you are unable to figure out the starting angle of your motors, you could always implement some startup sequence which raises all the motors slowly up against some stopper and try detect when they stall to reset the encoder to a known angle. For smoothing out movements, consider also how much slack is introduced by the gears. If you suddenly switch the direction you move the motor in, the slack in gears can cause some jerkiness in the movement if not accounted for. This effect can be really noticeable especially in delta-robots where the end effector can be far away from the supporting structure.

Nice vehicle! Is there a way to brace the front lights better to keep them aligned?

Hi again EB. It's been a while, but I have expanded the collection with a 3rd vehicle in the same scale: a Development Drill. DD422i Development drill with dual booms for efficient tunnel face drilling. Designing this proved surprising difficult given the 1:14ish scale. The body came out to be even 8 studs wide which does not always mesh nicely with Technic :). At this scale many of the functions are not that 'impressive' to play with but this was designed primarily for display Manual functions: Articulated steering (from the knob at the back) Adjustable drill booms Openable cabin doors Hydraulic jacks to lift and level the machine during drilling Cable reels (electricity and water) The whole trio was on display recently at a local Lego convention. For that occasion I went and built a backdrop cutout of an underground tunnel so that the exhibition visitors would better understand what these machines are used for. Since my initial post, I have also done major redesign to the front-end of the loader. Now the bucket has enough reach to be lifted high enough to dump ore to the bed of the truck. Thank you for reading :)

I have only used python to drive my EV3, so cant really help with the native block programming language. If you feel something is wrong with the IR, maybe build a simple program that just measures and outputs the signal strenght to read? Then observed if there are major fluctuations in the readings while the sensor and source of IR are stationary. This would narrow down troubleshooting the actual issue or identify potential other sources of IR nearby. For the motors, apologies if I was unclear. I meant to switch the ports the motors are connected to. So B to C and C to B in your case.

If it shoots and identifies IR signal correctly while lifted off the ground, my guess is either your program or physical wiring incorrectly drives the motors in reverse direction to expected. I would try swapping the cables of the 2 driving motors with each others ports on the EV3

Cool mech! What do you use to control it and how complicated is that setup?

Excited to see how the track will fit and look at this scale. Those new shock absorbers look so much more realistic in larger scale models.

Nice looking baja truck! looks like it will be fun to drive and play around with. Outside of colour scheme, have you considered what makes this specifically an Arctic vehicle? What I can think of could be: Less need for air intakes for cooling, reinforced front and underside to cope better when hitting a snow bank, maybe a snow plough to clear our a path in rougher terrain? Looking forward to seeing this in action!

Thanks for all the nice comments <3! At one point I experimented with safety rails on the loader in the digital model, but I couldn't design connection points for a folding mechanism for them that was not too flimsy so I decided not to add them. Yes there is a little flex in the trucks articulation. It's not fragile but it does tend to bend, especially if the bed is raised. That area could be improved for sure.

Pair of machines used to transport rock ore in underground mines. Built in roughly 1:14 scale.The machines are always designed as a pair; they fit in the same tunnel size and the trucks load capacity is 3 of loaders bucket scoops. I tried to build them as close to the real counterparts while also retaining some functionality to make the fun to play with. Both vehicles are in their "stock" configuration with only proximity detection system installed (6 white round sensors). LH517i Loader Loader designed for 5m wide tunnels. 17 ton load capacity bucket. Manual functions: Articulated steering (from a knob at the back) Bucket arm lift (from a knob at the back) bucket tipping openable door The bucket is painted red as Lego does not have a suitable red bucket at this scale. The current one is also comparably too short but the width is correct. Also I might want to revisit the loaders arm geometry as currently it can't lift it high enough to load the truck from flat ground. The rear white sensors are attatched using blue tack. TH551i Truck Truck designed for 5m wide tunnels. 51 ton load capacity. Manual functions: Articulated steering (from a knob in the front) dump box tipping openable door More pictures can be found from my Flickr Gallery: FLICKR Picture of 6m wide tunnel model variants for reference: Thanks for reading :)

Thanks all, hope this proves to be useful to others as well! I actually started out with designing a clip version, but creating small elastic clips that don't break is really hard with a 3D printed part. Also in my version due to the compressed tension in the battery holder clips, the screws are mandatory to hold the lid in place. The electronics would need to be separate from the cover for a clip version to be possible.

I 3D printed a new battery box cover for my EV3 for a custom AC adapter earlier this year. Material list is: 3D printed battery box cover (Stl file uploaded here: https://bricksafe.com/pages/Heppu/wip-/ac-adapter) 2x 15mm M2.5 screws DC barrel jack socket AC/DC wall power adapter 12V/3A (9V/2A is enough for most use cases) Electrical wires (red=plus, black=minus in above picture) Battery holder clip from a AA battery box & a metallic washer as contact points to EV3 (Hot glue for attatching the battery clip & tin to solder the electrical wires) Hope this helps anyone attempting to do similar projects :) I'm always open to answer questions if needed. Philo has instructions for a similar project for Mindstorms NXT: https://www.philohome.com/nxtsupply/nxtsupply.htm Hes' is maybe better than mine having a fuse, but I've had no problesm with mine so far.

Really cool project and addition to an already amazing display of automation possible with Lego! Shame about the motor, hopefully it's salvageable somehow.

Check Bricklink inventory for extra parts: https://www.bricklink.com/catalogItemInv.asp?S=42123-1