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amorti

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Posts posted by amorti

    [CADA] CADA General Discussion Topic

    in LEGO Technic, Mindstorms, Model Team and Scale Modeling

    Posted · Edited by amorti

    So, I tested the CaDA springs on my kitchen scales. They peak at about 1150g of force before they bottom out.

    Lego springs are around 1250g.

    It's not a massive difference and the suspension still doesn't work right, but it does let it return just a little higher. That and a friction pin at the top of the shock to reduce slack (it barely rotates at all anyway), and the car will sit at a sensible ride height on the shelf. At least until the springs sag.

    Oh, and while I'm whining: the seats are held on by a single 1*2 plate, where there's space for a 1*4 plate without any further modification. Do yourself a favour and take two if those from your spares.

    [CADA] CADA General Discussion Topic

    in LEGO Technic, Mindstorms, Model Team and Scale Modeling

    Posted · Edited by amorti

    If you omit the few pieces intended to stop the front axles disappearing when you put the wheels on, then it is able to return. But only a little bit, because actually it turns out that the springs are too soft.

    Also, there's a dark grey 20t thin bevel gear that redirects power from the prop shaft to the engine. It's in a 12:20 ratio, but it should have been done with a 12:12, because the 20t gear is too big. It hits the ground first when you bounce the front suspension. I'm not sure if it clears the crankshaft though, with 12:12.

    So the motto for this build, particularly when you compare it to e.g. the Lego white Porsche, is that extra functions are great... When they actually function.

    [CADA] CADA General Discussion Topic

    in LEGO Technic, Mindstorms, Model Team and Scale Modeling

    Posted · Edited by amorti

    On 4/2/2025 at 7:23 AM, amorti said:

    I finally started on the larger scale Citroen rally car last-last night.

    This evening I finished the build.

    It's a nice build! However...

    The steering needs modifying to work as a manual system (unsupported gear due to bad construction / more likely forced by it being able to modify to RC)

    The front suspension feels decently weighted, but has too much friction to return. This seems to be due to excess friction in the ball joint hubs, although there are also some friction pins in there which I'll try swapping out for non-friction.

    The fake motor works smoothly... If you switch the half-pins for Lego, otherwise the pistons go up but don't come back down. The CaDA pins have CaDA embossed on the part, which acts as a friction ridge. You could also smooth it with a sharp blade but obviously you shouldn't have to.

    I won't motorise this one. I learned from the red model team style Porsche (same author M. Schlegel but I'm afraid I forgot his username here, someone please tag him if you remember it?) that driving system brick models doesn't make a whole lot of sense. However, compared to the Porsche, this one has a really solid rear axle and I wouldn't foresee it having a problem with skipping gears at all.

    [CADA] CADA General Discussion Topic

    in LEGO Technic, Mindstorms, Model Team and Scale Modeling

    Posted · Edited by amorti

    I finally started on the larger scale Citroen rally car last-last night.

    Two nights of building have seen bags #1 almost completed.

    It's going well so far, but...

    The steering wheel connection is built to be easily removable to insert a servo. It leaves the idler gear very floppy to the point that the manual steering basically doesn't work. There's an easy fix by just omitting two parts but it might not be obvious to everyone.

    There are 10x bags numbered 1, then bags 2&3. Phase 1 is over half the total part count. It might as well be unnumbered at that point.

    [MOC] Red Wolf - 4WD RC Race Buggy /w Buwizz

    in LEGO Technic, Mindstorms, Model Team and Scale Modeling

    Posted

    10 minutes ago, Toshi said:

    I for my part was not aware of them…

    Yes, a diff frame with bearings would be very cool!

    The one from the link is plastic though, right?

    It is.

    I have some of their wheel hubs. They're 3D printed, but the print quality is very good.

    I made a video, but nobody really noticed it. Pretty niche, apparently.

    https://youtu.be/wvKhLBN7UZo?si=j1hbqf7NqiWHpQNm

    Pneumatics General Discussion

    in LEGO Technic, Mindstorms, Model Team and Scale Modeling

    Posted

    2 minutes ago, pekka111 said:

    Is the compressor some Lego part or something that you build?

    In that model there was a battery pack and motor, driving a pneumatic cylinder to put air into the system. If you want to see the idea, you can (probably?) download the instructions at lego.com.

    Or otherwise, they used a similar system with more modern parts on the Mercedes Arocs, pretty sure you can still get the instructions for that one.

    Pneumatics General Discussion

    in LEGO Technic, Mindstorms, Model Team and Scale Modeling

    Posted

    I loved pneumatics as a kid, because I had the big black truck with the compressor.

    But somehow these days I find actuators better, as you can actually get accuracy with them.

    I happened across this set NIB at the local science museum and bought it on a whim, but now don't know what I'd do with it.

    Anyone in the EU interested in buying it?

    https://www.bricklink.com/v2/catalog/catalogitem.page?S=9641-1#T=S&O={"iconly":0}

    BuWizz - High Performance LEGO Power Functions Controller and Battery

    in LEGO Technic, Mindstorms, Model Team and Scale Modeling

    Posted

    30 minutes ago, Aurorasaurus said:

    ;) come to the dark side, we have more range than you have space to play with

    Hopefully buwizz 4 uses proper radio control.

    It's so tempting, but a big part of my fun in MOCing comes from using stud.io and eventually uploading instructions. The brushless world wouldn't offer that.

    Also I feel like the setup costs could be quite a lot? I don't have any part of what's needed nor the knowledge. So battery, charger, transmitter, receiver, speed control, geek servo, etc.

    Eh, maybe one day. Maybe.

    BuWizz - High Performance LEGO Power Functions Controller and Battery

    in LEGO Technic, Mindstorms, Model Team and Scale Modeling

    Posted

    Just to chip in on the "bw3 dead battery" issue. The box has an accelerometer which is used for "shake to wake". I guess that keeping that alive uses >0 amps, such that over a long time it would pull the battery below where a cell can be revived.

    @Zerobricks could you tell us more about the new disconnect feature mentioned in the app update? The lack of a failsafe in case of disconnects is what caused me and @aFrInaTi0n to set our RC motorcycle projects aside for ages. You can probably imagine what happens if a 25km/h motorcycle gets out of range and, as the previous software, just continues on full throttle. So it would be good for testing purposes, to know what we can expect it to do now. I assume if ping without pong, then stop all motors?

    [MOC] Red Wolf - 4WD RC Race Buggy /w Buwizz

    in LEGO Technic, Mindstorms, Model Team and Scale Modeling

    Posted

    I would upload it without the special parts, and just leave some suspicious lime green liftarms in place of the ones which require a bearing :)

    As for the washer, maybe you could put a lime green 15535 "round 2x2 tile with hole" in that spot as a clue. Probably it will collide which will hurt your feelings, but it would still have less collisions left in than most instructions on RB :)

    4 hours ago, Didumos69 said:

     

    I see something familiar in the background there :)

    Now you're apparently back out of a mini dark age, maybe you would publish that?

    [CADA] CADA General Discussion Topic

    in LEGO Technic, Mindstorms, Model Team and Scale Modeling

    Posted

    1 hour ago, Sokolov Edward said:

    The grille of the new AMG clearly has non-technical details. About filling holes with bricks was not written directly about this model, although here too in the area of the wings they laid bricks well.

    Opinions are like elbows, so here's mine:

    These motorised 1:8 cars are scale models first, and technic/RC models second. They have to be, because the license-giver insists, as we're told above. That might mean custom panels like the AMG One, or it might mean using some system bricks as shown here. I'm not against either option, because let's be honest the 1:8 cars are too big to seriously drive regularly anyway. Doesn't matter how well you construct them, they can't go over about 5km/h, which isn't really much fun. And there's a pretty high risk of breaking CV joints, differentials, and even twisting axles in the end.

    So. If you want good Technic play models and are OK with them taking liberties regarding the original looks, you can get that from Lego with 42166 or a bunch of other "because the stickers say that's what it is" licensed sets.

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