Eddie_Young

Your photos are beautiful I usually only do nice photos of the finished product because I'm lazy... I've had a 7kg robot in the past and since you said you're going for around 20 kg, you really have to be careful about estimating the gear ratios, the wheels are enormous! And I definitely agree with two motors per wheel. Sketchfab looks cool but what does one use it for?

I am fully satisfied in that case

Truly amazing!!! I've always wanted to build a huge MOC and now more than ever...

I know this isn't really what you had in mind, but I was asked to take care of my little sister today and she really loves my Wind-up Robot. She asked me if she could build one. I helped out a little bit...just to make sure it would still walk. I find it absolutely adorable which is why I decided to share it with you. I apologize for the photo quality...I am lazy This was an attempt at an artistic photo Notice how it looks to be peeing when viewed from behind I hope you like it!!! LEGO Ideas

Awesome!!! I'm wondering...do the doors click into place when opened/closed like they would on a real car?

If I wanted to anger you, I couldn't find a single flaw to taunt you with! This is absolutely wonderful Are there any CLASSIC bricks in the build?

many and about two years on and off There's a delicate balance between being too weak to walk and to strong to stay stable. I also tried prongs like the originals used to have but this way works much better. And anyway...It walks as far as the originals and I find the strange gait makes it more interesting I do agree on the legs' style...I'll look into it

I really can't do any better with the walking the gear reduction I have is the best I could find. Thank you so much

I'm still improving but the legs are very tricky to get right. Thank you for the tip though :)

You can!!! Just support and it might be yours in the future!!! (I'm not promoting...just giving friendly advice )

If you remember those little clockwork robots, which used to be toys and are now prized collection articles, than you will surely recognize my representation! I've been working on this for some time now and I'm proud to say that this robot walks as well as the real thing! It uses two pullback motors, a couple cogs (gears) and 623 LEGO elements to achieve (I only hope you agree ) both good looks and great functionality. The mechanism with the incorporated motors is made to fit exactly into the case and the case comes off all in one piece (I like my modularity). The mechanism for the legs is the most simple thing ever but making it was as complicated as any of my larger MOCs, because balance played such a vital role in all of it. You can still see it wobble as it walks (I find the wobble quite indearing though ) and a lot of work went into keeping it from falling when it does. I like to think this is my best work yet, so I hope you like it just as much enjoy!!! My Flickr gallery

nice

I actually thought of using worm gears, because they only let power in from one direction....but then I'd have to gear back up and I'd be losing power in friction.....I thought that's not really important since I'm really just looking for speed But I'm just saying....it is possible to make a three speed gearbox like this...I find it nice What is notorspam robot?

You are exactly right, that's why there's more torque on only Ls....XLs have more resistance when not powered. I actually thought of this mechanism using EV3 motors (big and small ones), which can be stalled....I even got more torque from the second speed with those! I calculated theoretically and arrived at 300 rpm and then measured from videos and found 350 rpm... The theoretical speed it should reach in a straight line is 18 km/h but I don't have enough space in my room to test :D

There we go I know it's a bit cheesy...

18. The Mould CAT B - PF IR Signature move: The Dervish Drive: 2XL + 2L motors Dimensions: 45 x 25 x 11 L The power of my design is it's durability. I decided to not use any swingy, spinny things, because they may snap off. Also, I have a limited amount of motors. So my solution is to put all I've got into the drivetrain and allow the "weapon" to share it's power. The signature move is simply running the motors in opposite directions to make the whole robot spin. The result is 1,5 kg of plastic and batteries spinning at around 350 rpm (calculated from rpms of loaded motors) with plenty of torque to maintain that velocity even through countless hits on the opponent. Running in a straight line, it could reach about 18 km/h with a good run up...which serves for offense as well as cowardice. I can also drive the robot slowly for accurate manoeuvrability...that's using gears, not speed controllers (explained in the discussion topic). The durability of my robot is shown towards the end of my video. Yes, the house is so horrible on purpose :D

Oops thank you, agrof

The Mould is meant to be the hollow container used to mould things. Not to be confused with the furry green growth on your yoghurt. Please check out my Wind-up Robot project!!! It really walks, powered by springs! I always enjoy the fact that LEGO elements are very light. In this case however, it is hard to get any mass into the weapons....and mass is needed for kinetic energy. The only really heavy elements I can use are loaded battery boxes. But then...adding batteries that don't power anything would add unnecessary weight to the whole robot which would slow him down and make him less manoeuvrable. I don't wish to use too many motors because I have learnt that adding more than one L or XL motor to a single PF IR output results in both of those motors being slowed down and adding more batteries makes the robot less manoeuvrable for it's weight..... In light of the two previous arguments I have decided to make a design that actually uses the chassis as a weapon. The idea is that I put all the power I can into the drive and use skid steering. Running the motors in opposite directions will then make the entire robot, with all it's weight, spin at high velocity...I shall call this 'The Dervish' and that's the signature move of my bot . I shall use two battery boxes, each box will be equipped with a PF IR receiver and each receiver will power one L and one XL motor (I only have two of each of those motors and that's it for motors). I will combine the outputs of the L and XL motors through differentials, thereby getting the average of there speed and the sum of there torque on the other end...by doing so, I avoid having to equalize there speeds through more complicated gearing. I know what your thinking......I'm trying way too hard to make this robot fast...I'll never be able to control it...... But that's the beauty of my grand design!!! The differentials act as a sort of simple gearbox...by running only one motor, I will get around half the speed but with twice the torque of that one motor!!! By running the two motors in opposite directions I shall receive a speed equal two the the difference between the L and XL motors' speeds divided by two (this last one will have very little torque however.....this is all given by the original equation for differencials....I can explain further if anyone's interested). So basically....I can go super fast with plenty of power, but I can also choose two different medium speeds (running only L or only XL motors) or a useless, sluggish, powerless speed which might be usefull for aiming and subsequent ramming at high speed . "Oh stop talking and start building, idiot".....okok, bear with me The other reason, I like this I idea, is that it has no moving parts (except the wheels that is). So there's nothing that could snap of easily and nothing loose to make it shaky. Durability is probably the greatest strength of my robot (demonstrated in the video)...It is quite simply a fast block of plastic. Construction: So I made two versions which I then took appart because I thought I could do better in durability and/or functionality...this is the nicer one of those two: I'm only going to show the work in progress photos of the final version. So....I started with the gearbox: All motors are geared up to 1:1,67 (12:20) before they enter the differencials...SPEEEEEEEEED I already had some idea of how I'd like to make this bot durable (this is my 3rd try)....I tried to brace all the important elements with these frame-like bricks because I know they won't fail me. The video will show this guy's great durabilty. Notice that the motorcycle wheels' diameter is greater than the height of the robot, so it can run upside down. I chose the motorcycle wheels over the ones used in the first photo because they're thinner and therefore have less friction when turning. (traction is still more than adequate) Lastly, I added a battery box on each side as far off center as they could go to still fit into 45 studs. This is to gather as much momentum as possible when spinning while not increasing the weight. I then added some reinforcements all over the chassis as well as some bodywork to make it look nice and a couple weighted bricks to balance the chassis....I don't want energy too be lost through vibration when spinning so balnce is paramount. I also rebuilt the controller to make it easier to control the individual motors as I explained earlier. And took that opportunity to make it more ergonomic. I'll only post the video into the entry topic...it's not ready yet. Thanks for reading. Hope you enjoyed.

I'd cover the wheels, hold them on from both sides....you're gonna need them

Sorry about that and thank you for the fix

Yes, he can be a bit of a "big behind" sometimes.

Please support my fully functional walking Wind-up Robot. I'm posting this to the Technic forum, because it is actually a LEGO Technic/Mindstorms creation. The Classic bricks are only on the outside. I built this for Christmas 2016. It gave out presents to all our friends and family. The product of two months work! The sleigh is driven by two NXT motors (controlled by EV3) and Rudolph's legs are powered by a PF M motor. Santa Claus has an incorporated pneumatic system using two pistons, a pump powered by a PF L motor and an EV3 motor which opens and closes the pneumatic valves. The video shows a case where Santa rejects a naughty kid and, in the end, doesn't give him the present. I hope you enjoy the video as much as I enjoyed building. Merry Christmas !!!

So when does the voting begin?

Yes, crappy jokes go well with toilets.