dtoerien

Thank you, that was very interesting and informative. I particularly enjoyed your creativity and skill in producing the fifth video - the packed suitcases highlight the astonishing, and humorous, attention to detail. Regards, Darryl

Many thanks for this and for the instructions.

Many thanks for the helpful advice. I'm beginning to appreciate the difficulties of dealing with this in the axle.

Thanks, that is what I was starting to conclude. Your other advice is beyond me at the moment, so I will need to work through it more carefully. Thanks. Your link informs me that hotlinking is not allowed. I gathered from another topic that a worm gear might feature, but am not sure what this means.

Yes, i run out of gear rack very quickly, which is why it sounds like something is shredding or about to pop off. If the gear rack were longer, which I was thinking of doing, would't that create the same problem?

Thank you. Unfortunately the issue of gearing is another area that currently way beyond me. I had suspected as much, but it will take a little work for me to figure out the next step.

Hello and thank you. FYI, I was very interested in building your crawler (karma.lxf) but didn't have a V1 IR receiver. See below for the hubs (top and bottom view). The steering works really well, it's just that it over-steers very quickly; i.e., the motor keeps trying to turn but there is nothing left for it to turn. Perhaps the steering requires more finesse on my part?

Hello. I am relatively new to LEGO and very new to Technic. I am particularly interested in the challenges presented by building rock crawlers. My first build was JJ2's 4x4 Super Cralwer V1, which was very rewarding. SevenStuds then kindly directed me to Yoraish's Little Boy Rock Crawler as an instructive build, which it certainly has been. Having just completed it, I have a number of questions that I have not been able to satisfactorily work out for myself and am hoping to benefit from community wisdom. (I am using a rechargeable battery and a V2 IR receiver, along with the original 2 XL motors for driving and the M motor for steering. I am also using very cheap tyres that approximate Pro-Line Flat Iron 1.9" tyres as a test before forking out for the real ones.) I understand, I think, that you might choose to use a M motor (or a L motor?) for steering if (a) you don't have a Servo motor, or (b) have space constraints and/or (c.) require greater torque. Are there any other circumstances where you would use a M or L motor for steering over a Servo motor? I tried using a Servo motor instead of the M motor and it does not turn the wheels at all, although it attempts to. I assume that this means that it does not have enough torque? In Sariel's book, he mentions that the Servo motor has "huge torque" and so "won't be easily stalled" (p. 169). The M motor, however, easily turns the wheels. ​Does this mean that the M motor has significantly more torque than the Servo motor (Sariel's book doesn't appear to give the torque for the Servo motor, or if it does I missed it) If so, are there any circumstances where you would/could use a Servo motor for steering a crawler and how would you decide this other than trial and error? Yoraish's has the Little Boy doing some pretty extreme crawling (at least it seems so to me) with little difficulty. I find it difficult to tackle a pillow in my lounge without it sounding like something is going to break while steering and have, in fact, managed to pop a wheel off (I experienced the same difficulties with the Super Crawler, which JJ2 kindly helped me to address). I gather that the M motor just keeps turning until you stop (but that unlike the Servo motor does not return to centre when released); this sounds distressing and seems like it could cause actual damage. Is there any way to overcome this? I ask because I and my son - 2 and 1/2 - find it difficult to concentrate on negotiating obstacles due to concerns about damaging something and/or bits popping off. Perhaps it requires greater skill than I/we have at steering? Sorry if I have not asked this particular question well. Many thanks, Darryl and Reuben P.S. I think/hope I have done the images correctly. P.P.S. Any other recommendations for refining this build would also be appreciated (DLuders was very helpful in devloping the initial thread - many thanks).

It's all happening today! Again, thank you - straight on the To Do list. It's very late here so I'll only be able to have a look tomorrow. Enjoy the remainder of your weekend.

The lineage is unmistakable. You've certainly addressed the limitations you identified in V1 - any lessons so far from V2? Again, well done!

Wow, having built V1 this looks like a serious evolutionary step - well done! I echo the question about tyres and rims.

Now I'm really interested!

Excellent - made my day. Thanks.

Thank you very much for your time and effort. Regards, Darryl

Thank you paulneves - I think I might have missed this introduction to the awesome work of mahjqa had you not posted. Thank you mahjqa for the wonderful sense of humour that you bring to your work.

No, sorry, I don't. I am only just getting going with Technic, hence all the questions. Best wishes for your build and I shall look forward to your pictures. Darryl

So if space/size and cost weren't considerations, you might still want to use a M-Motor for steering in order to get more power, given appropriate gearing down? Would there be conditions that might require a L-Motor with appropriate gearing down?

Is space/size the only reason why one would use a M- or L-Motor for steering? If not, under what circumstances would they be better than a Servo Motor?

I was delighted to discover this morning that as of 10 April there is a photographic assembly sequence for this on the SevenStuds site (thank you), along with the invitation/encouragement for others to build and improve the chassis. However, being a Technic novice, I am fairly soon out of my depth. If anyone has done any work on this that they would be willing to share, I for one would be very grateful. Regards, Darryl

Thank you, I see that now.

The black gives it real presence, especially from above! Please forgive my ignorance, but what is the significance of the yellow stickers on the wheels?

I don't recall having any Lego as a child, although some of my friends did. I developed an intellectual interest in Mindstorms in the early 1990s after meeting Seymour Papert, the 'father' of Logo (I still love this language). Still no Lego, though. When our son was born in 2013, I bought us a large box of Primo. This was followed by our first set, the legendary 10507 - Duplo: My First Train Set ;) Then, somehow, early this year I stumbled across a Lego rock crawler on YouTube, which opened up the world of Technic for me. 9398 seemed like an appropriate set to start with.

Thank you for this amazing crawler - it has certainly helped to raise the already-high bar. Are you still planning on making the .lxf? I fully appreciate the effort that it would take, but also would very grateful; I am brand new to Technic, particularly drawn to crawlers and have found the opportunity to learn from the excellent work of others - thanks to their generosity of spirit - invaluable. I am hoping to finish my first ever build today, which is JJ2's 4x4 Super Crawler. Thanks again for pushing the envelope.

Yes, that is what I thought, which might broaden its appeal on LEGO Ideas?

Thank you for this - I have spent a fair bit of time navigating my way around the Site, inefficiently as it turns out.