PunkTacoNYC
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[MOC] Lego Technic Cactus Crawler
PunkTacoNYC replied to PunkTacoNYC's topic in LEGO Technic and Model Team
I have identified the cause of the hose length and rear axle rigidity issues you are having. The LDD incorrectly shows the rear links as being shorter than they should be. The picture below shows the CORRECT setup used in the video. The difference is that the rear links are essentially as long as they can be. Sorry for the confusion, LMK if this helps. -
[MOC] Lego Technic Cactus Crawler
PunkTacoNYC replied to PunkTacoNYC's topic in LEGO Technic and Model Team
Soft RC tires do help. I used the RC4WD 1.9" Kryptons without foam inserts. I do not have any mods planned of this crawler specifically, but I am currently working on my largest and smallest crawlers which you can find information about here: https://www.snupps.com/punktaconyc/shelf/2705503--rock-crawlers -
[MOC] Lego Technic Cactus Crawler
PunkTacoNYC replied to PunkTacoNYC's topic in LEGO Technic and Model Team
Ok, lots of questions. The two rear motors are facing opposite directions, so they do need separate ports on the Sbrick so that one can be reversed. The AA battery pack is larger, heavier, and less powerful than the buwizz, so it is certainly expected to perform worse. It is slow not only because of the AA battery pack, but also because it is a rock crawler - geared down for maximum torque over speed. The BuWizz will give it a noticeable speed and torque increase. The small Lego LAs are unfortunately weak for this application. They should be able to turn the tires completely without slipping, however. Perhaps the Lego tires are too grippy on the hardwood/carpeted floor. I think I see the issue. The LDD file has the two rear links incorrectly swapped with each other. In other words, the right link should be on the left and the left link should be on the right, the towball levers would have to be flipped so that the towball pin would be facing inwards towards the chassis. I'll post an updated LDD file tomorrow, but if you pause at the 1:39 mark on my Cactus Crawler youtube video (https://youtu.be/IyxIwBCkZ2s?t=99), you can see the correct construction, orientation, and placement of the rear linkages. This should resolve any weaknesses in the rear axle. Let me know. Thank you all! Yes, ultimately I had to decide between more ground clearance with a BuWizz and an SBrick or worse ground clearance with just a BuWizz. Because, at the time, the BuWizz app was extremely limited compared to the SBrick app, I chose to use the chassis that included the SBrick - the one that only allowed two of the four BuWizz ports to be used. I'll see if I can find pictures of the other chassis designs that allowed all four BuWizz ports to be used. -
[MOC] Lego Technic Cactus Crawler
PunkTacoNYC replied to PunkTacoNYC's topic in LEGO Technic and Model Team
Hi fongalv, You are 100% correct about using the 15100 Technic Pin Connector Hub piece instead of the green piece. I inserted that green piece (and colored it the standout green color) because Lego Digital Designer - or at least my version of it - did not have the 15100 piece which is, in fact, the correct piece to use there. Nice job, I probably should have made public note of that somewhere . Anyway, I am delighted that you chose my Cactus Crawler to build. Please let me know if you have any other issues and I'd love to see the end result! Also, here is my snupps page, everyone, where you can find the instructions (LDD file) for my Cactus Crawler: snupps.com/punktaconyc -
I like the better bracing. I do hope there will be some sort of extension hub for the wires. The real question is if we will get a PoweredUp SBrick or BuWizz... Also, is it the PoweredUp ecosystem that allows low-level programming - like the SBrick Plus? Or was it Wedo, or Boost? why's there so many?
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Custom third party Universal Joint 3L
PunkTacoNYC replied to Ctan's topic in LEGO Technic and Model Team
Thank you Ctan. I just bought a Dremel today! -
This is exactly what I did for my LEGO Cactus Crawler. I haven’t had any issues with it on iOS 11. I connect to the BuWizz with the app, switch the power mode to fast, then switch to the SBrick app for its superior control customization.
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BuWizz - High Performance LEGO Power Functions Controller and Battery
PunkTacoNYC replied to Jim's topic in LEGO Technic and Model Team
I just wanted to let everyone here know that I, too, have had issues with my iPhone 7 iOS 11 not connecting correctly to the BuWizz. I tried everything including deleting and redownloading the app, reassigning motor controls, restarting the BuWizz, turning Bluetooth on me phone on and off. What fixed it? Restarting my phone. So just keep in mind that the issue may not be what you think it is. -
Custom third party Universal Joint 3L
PunkTacoNYC replied to Ctan's topic in LEGO Technic and Model Team
Great job with the U-joints, they fit perfectly. So perfectly, in fact, that I need some for my own crawler project. You see, I am currently building a relatively large lego rock crawler with huge wheels (these 2.2" bully comp tires with Lego porsche rims). Unfortunately, I am not using portal hubs for this crawler as the wheels are large enough, so I cannot gear down to reduce stress on the U joint. Thus, I have been looking for a metal alternative to lego U-joints and you seem to have made it. Could I buy some of those modified lego-compatible U-joints from you? If not, could you please give me more information regarding the U-joints you bought as well as the drill you used so that I could create them myself? Sorry for the slightly off-topic reply. What can I say, your post was inspiring. (I didn't want to hijack this thread at all, but eurobrick's apparent lack of a messaging feature somewhat forced me to) -
Lego Rock Rod - Buwizz powered crawler
PunkTacoNYC replied to filsawgood's topic in LEGO Technic and Model Team
That's pretty great looking, I love the non-traditional mounting of the drive motors. This is also the first time I have seen someone use those tires for Lego, and they seem to work well. Those perpendicular gears in the rear axle, though, worry me. Have you had any issues with gear slippage there? -
[MOC] Lego Technic Cactus Crawler
PunkTacoNYC replied to PunkTacoNYC's topic in LEGO Technic and Model Team
Nope, I'm not doing body work as it would, in one way or another, detract from its performance. -
[MOC] Lego Technic Cactus Crawler
PunkTacoNYC replied to PunkTacoNYC's topic in LEGO Technic and Model Team
Yup, definitely for this crawler. I've even tried working it into the steering for larger crawler projects but its size makes it very difficult. -
[MOC] Lego Technic Cactus Crawler
PunkTacoNYC replied to PunkTacoNYC's topic in LEGO Technic and Model Team
Thanks! It was in Brooklyn, near the bridge. There are a lot of great areas to film there, especially recently since they have now renovated, adding lots of great rocks for crawling as shown in the video. This is actually where I filmed most of my shots for my Unimog Trial Truck. I, too, like my steering solution. It provides a great turning radius, rigidity, and a decent speed. The only downfall, however, is that the plastic linear actuators cannot handle too much torque and, thus, slip quite often. There is absolutely nothing I can do about this, however, with the only solution being lego designing a more heavy-duty LA of the same size. Thank you, that is what I am aiming for! -
Hey Everyone! Here is the successor to my Lego Technic Chili Crawler, the Cactus Crawler It took about half of a year of design and revision to reach its current state, of which I am proud of. THE VIDEO: youtube Features: - 3 L-Motors for drive (two in the rear axle, one in the front) - M-Motor and a small linear actuator for front steering - Rigid, triangulated 4-link suspension for the front axle, with large, soft, black shock absorbers - Extremely rigid 2-link rear suspension with ball-joint pivot point on top of the axle, similar to that found in the RC "Mantis" crawler - 100% Lego-legal custom curved rear links that, with how the main cab is shaped, provide exceptional ground clearance towards the rear of the crawler, allowing it to climb up relatively large vertical structures such as street curbs - Very minimal, light bodywork - BuWizz for extra power and SBrick for a great, custom control scheme Note: By the time I finished designing the cab and it's battery enclosure, BuWuzz had not yet come out with the update for their iOS app that allows a single joystick/slider to control multiple outputs, so I was forced to use an SBrick with the BuWizz, providing the extra power from the BuWizz, but with the ease-of-use and great custom control profiles of the SBrick. When used with the SBrick, the BuWizz does in fact still provide more power than the standard Lego 8878 LiPo battery box. - RC4WD 1.9" Krypton scale tires - Two green pieces so that I can call it the Cactus Crawler ;) LXF hopefully coming soon, the tires can easily be found with a quick google search of their name. YES, I know, there is no body. This is meant for performance, meaning I made the cab as small, light, and rigid as possible. I will be able to reply intermittently throughout the day. I figured I'd put this up now anyway! pt
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[MOC] Lego Technic Chilli Crawler
PunkTacoNYC replied to PunkTacoNYC's topic in LEGO Technic and Model Team
Sounds great, I'd like to see the photos and video. I was considering using a Servo motor as it would have required less gearing and therefore theoretically should have been more efficient (less backlash/friction) than the current solution. As you mentioned, though, because the Lego servos are weak relative to those used in actual RC crawlers, we must decide between having high torque and small steering angle or vice versa. Another issue I have found with the servos is that they require constant power to hold their position; at least when they are not in their default position. This means that the servo is taking power away from the drive motors, whereas my solution requires no power to stay in any position, allowing full power to the motors. Until Lego releases a more powerful servo/battery solution, I likely won't use any servos in my larger creations. That being said, I have not yet tried using a servo setup with the BuWizz. The extra voltage and temperature limit will make it less of a strain on the vehicle's other functions. The M motors are an interesting idea. pt