jrx
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Everything posted by jrx
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It's a nice one. I think it should work in your scale. Looking forward to your leaf springs. -
Sounds really good :) P.S. Same with my wife ;)
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Hi @I_Igor thx for link - and yes, I like it! It's an interesting scale you're using for your MOG. It let me think of a Zetros in a similar scale ;)
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@I_Igor development is still going on. At the moment I improve the connection between motors and drivetrain. Update follows the next days. Some weeks ago I tried to find some of your MOCs. But as your very active here it was hard to find. Can give me some links to your MOCs? @Lox Lego Don't know :) But thx a lot!
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Thx @Paknaloid
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Thx @I_Igor
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The Zetros felt a little alone so I built a trailer for it.
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Last weekend the 6th SteineWAHN 2017 exhibition took place in Berlin. On around 1'400 m² nearly 50 exhibitors showed their MOCs for two days. Far more than 1'000 visitors came to the north of Berlin - and hopefully had much fun. I as one of the exhibitors can say: It was a great event - well organized and with really good creations. If you like you can get an impression of the Berlin SteineWAHN by my video (Sorry! The two days were so fast over that I didn't manage to film all MOCs). On my Flickr account there are many pictures showing nearly all MOCs: Pictures of SteineWAHN 2017 Berlin
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Really fascinating MOC!
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[MOC] Case IH Steiger 620
jrx replied to TeamThrifty's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi, looks really good your tractor. For embedding pics here: Go on "sharing" arrow on flickr and copy the BBcode in size of your choic e and insert the copied code just in your post. That's it :) -
Thank you @lucio !
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[MOC] Bigfoot Monster Truck
jrx replied to paave's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Really nice MOC! I like it very much -
Thanks @Aleh!
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Absolutely It just kept bothering me.
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Today I thought a little about the words from @TechnicSummse : So I watched the video again and it came clear to me what the point was. The simple answer is: The Zetros didn't got stressed at the little hill, I took back some power to to prevent the axes and the gears from damage. Besides from that I for myself was curious why the Zetros performed that bad the last time I tried to climb a slope. So I took a closer look on the front axle. There I found the problem. The differential is the weak point. One cross axle slipped out of a gear and so nothing was working anymore. I repaired it and started a new Track Test - now successful. The 4,5kg heavy Zetros managed a ascending slope of 25° without hesitation. You can see it in the following video plus some more insights into my MOC.
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While looking at the picture of the drive train: What's missing there are the gears for the three diff locks at the axles. They are another (small) source of friction.
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The planetary gear are not the problem as the don't have so much friction. I used brand new and clean turntables and they rotate very smoothly. But I agree, it would be nice to measure the effective torque at the wheels. The next days I'll busy with work but then I may build up a little experiment set-up to determine the torque.
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Don't worry @TechnicSummse I really like to get honest feedback from the AFOL community. About the power: I think some of it is lost in the drive train, but it's still powerful (but not fast). Maybe you'll have a look at the earlier video about the final track test. You'll see, 1,5 kg less weight will make a big difference at ascending slopes
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Yes, the gearing produces some more friction. It seems, that the lenght of the drive train is a further problem. But for the moment I‘m happy with the Zetros. I plan a „spin off“ as one of my next projects. It will be a Zetros 4x4 with motors directly connected to the axes. So it should be faster and stronger and will be able to crawl.
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Now, as the Zetros is finished, I think two buggy motors could be enough - maybe. When I was building and planning my goal was tho enable the Zetros to manage a slope of 100% (45°). The nearly naked chassis made it, but not the finished truck as it is to heavy. So it's not about the speed but for the force. The Zetros is still able to climb a little. And it can go faster. I used just the "Normal" Position of the BuWizz to preserve the gears a little. If I go for the "Fast" mode the Zetros is noticeable faster. No, the lights are showing the same brightness at whatever action the truck is performing. I didn't measure the voltage while driving. Can't tell you exactly, in how far the different connectors of the buwizz are independent. Each pair of motors is connected to another connector of the BuWizz (through SBrick). I can't be much faster (only while switching the higher power mode of the BuWizz) as I geared it down by ~1:50 and as I'm using the slower output of the buggy motors.
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Hi there! @nerdsforprez Below you can see the whole drive train. At first I hard coupled two buggy motors and then connected both to the drive train. From the output of the connected four buggy motors to the wheels I geared it down by ~ 1:50 - if @Sariel's Gear Ratio Calculator is right ;) (I think it is.) So the torque is increased ~ 50 times. This way I managed to reduce the force on the gears dramatically. In one of the first versions I used two XL motors. With their high torque they destroyed repeatedly the gears and I didn't manage to bring all torque to the wheels. Now it works really reliable. The chassis without superstructural parts (weight around 3,0 kg) managed a slope of 100% (45°). Now as the model is 1,5 kg heavier that's impossible anymore. @I_Igor Yes your right. the portal is only very small to get some more ground clearance and gear reduction. You mentioned the suspension: I tried to replicate the leaf springs suspension as used in the real Zetros but I wasn't satisfied with it. So I switched to my solution the live axle with multiple links. @TechnicSummse Thx a lot! The four buggy motors are an integrated part of the chassis and are located beneath the cabin. In the cabin there are five servos hidden. The L motor for the winch is in the front behind the bumper. The second L motor for the compressor is on the right side behind the lower black panel. The M motor for the rotation of the crane is in the middle under the black beams beneath the crane. The second M motor is in the black box behind the cabin. The last motor, the servo, is in the middle of the chassis deep down below the crane just behind the buggy motors and is used for steering. Each one SBrick is behind the steps to the cabin. One SBrick is sitting between the compressor L motor and the chassis. The BuWizz hides behind the lower grey door and the Pneumatic cylinder of the outrigger on the right side. For completion: Two pairs each of PF LED are used for the head- and backlights, two on each side for the turn signals front and rear. Last but not least 2 pairs LED I'm using for the flood lights on the roof.
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Thank you all so much! It's great to get such fantastic feedback. @kbalage Can't tell you exactly. But it was lot easier to integrate four buggy motors powering the drive train.
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Thx to you all :) @MajklSpajkl + @I_Igor I just uploaded a more detailed view an my axes:
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Thx @suffocation! The turn signals are controlled by the sbricks. I put together three simple sequences - one for left, one for right, and one for the emergency lights. The good thing is, you can control one channel by different sequences. You can see some more pics on my Flickr channel in the album "ProjectZ". The front axle was a real challenge and I'm not fully satisfied with my solution. One day I'll construct a better version :)
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Thank you all for your nice words! Thx a lot! @Leonardo da Bricki After looking through wikipedia and some pics I'm sure you're right. I changed the description. Thank you for mentioning. Thanks to @Paknaloid for nominating the Zetros and me for the HoF! I planned to use only two SBricks and a geaarbox to switch between two rows of pneumatic valves. But the gearbox was to big to integrate and I didn't needed so many pneumatic valves anymore so I switched to three Sbricks. Then @teflon mentioned in the BuWizz-Thread that the BuWizz could be used as battery. That's great as I could go from two Lego battery boxes to just one BuWizz. the Downside was, I couldn't power the lights without another controller. And so I had to order and integrate Sbrick No. 4. I'm not sure to create building instructions for the whole model. At the moment I have unfinished lxf of the cabin and the drive train. Maybe I will play around with LDD and Stud.io later this year. So it's not sure that I'll make BI at all. To complete the picture of my truck here's a screenshot of the Sbrick profile I made: P.S. Sorry for posting with two accounts. I forgot about the second one but not my phone. I filled it in and I didn't expected this.