 | | Re: Lubricating technic turntables
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<snip> from using different types of yoyos and other things i have found that the best for inert lubricating is silicon lubricant, there are also some other lubes for nylon that i can't think of but i do know that they are out there. some vcr repair (...) (24 years ago, 4-Apr-01, to lugnet.robotics)
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| | Re: NQC for Palm
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<snip> it's too bad that all of you just HAVE to use a palm OS device. someone a long time ago ported nqc to windowsce and it works fine, i'm able to do on the fly programming and uploading with a first generation device, which i'm actually unhappy (...) (24 years ago, 4-Apr-01, to lugnet.robotics)
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| | Question about the UBS
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Is there is any information on what will be contained in the 'Ultimate Builder's Set'? (24 years ago, 4-Apr-01, to lugnet.robotics)
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| | Re: I wish Lego made an "Anti-Backlash Gear"
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(...) I know of 1 type of zero-lash/anti backlash geartrain. It's hard to put it in words but I'll try. My example assumes there are only 2 shafts but it can be applied to as many shafts as you need. In my example S1 represents our first shaft. (...) (24 years ago, 5-Apr-01, to lugnet.robotics, lugnet.technic)
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| | Re: Lubricating technic turntables
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(...) Before someone ruins their pneumatics..... Brake Fluid will ruin many plastics, will remove paint, and can even damage certain types of rubber seals. The rubber parts in an automotive brake system are made from special rubber that is made to (...) (24 years ago, 5-Apr-01, to lugnet.robotics)
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| | Re: NQC for Palm
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(...) Yes - NQC is developed on a Mac so PowerPC big-endian is actually where most of the testing is done, but I don't recall ever running into an endian problem. One of the builds (for Mac MPW) targets 68K, but with slightly difference options than (...) (24 years ago, 5-Apr-01, to lugnet.robotics)
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| | Re: I wish Lego made an "Anti-Backlash Gear"
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Interesting , but we need one for Lego! I do see what you are saying, and It is an interesting solution,, although a little hard to visualize...Thanks! (...) (24 years ago, 5-Apr-01, to lugnet.robotics, lugnet.technic)
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| | Re: I wish Lego made an "Anti-Backlash Gear"
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(...) I was going to say this solution is easy, but then I tried it. There are only two shaft's in this example. As lego don't make don't make a 'double width gear' You'd have to use four to make it in lego. All you'd need is three normal 16 tooth (...) (24 years ago, 5-Apr-01, to lugnet.robotics, lugnet.technic)
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| | Re: I wish Lego made an "Anti-Backlash Gear"
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Hmmm... (...) (24 years ago, 5-Apr-01, to lugnet.robotics, lugnet.technic)
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| | Re: I wish Lego made an "Anti-Backlash Gear"
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(...) Explain 'Hmmm...' :-) I of course omitted the fact that my solution as described produces no mechanical advantage just a shaft going in the opposite direction. Of course, you can always replace the pair of gears on the second shaft with a pair (...) (24 years ago, 5-Apr-01, to lugnet.robotics, lugnet.technic)
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| | Re: I wish Lego made an "Anti-Backlash Gear"
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(...) You can use those half beveled gears(with the recess) back to back as one gear, and one (maybe 2) crown gears as the gear on the other shaft. It depends on what the setup requires as of gear setup to work. Andy (...) (24 years ago, 4-Apr-01, to lugnet.robotics)
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| | Re: How about ideas for new elements?
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(...) Nah, keep the posts in the main group as a constant source of temptation for the purists :-) I take your point about these mods really coming into play when you have a large collection of parts - when I was young and had a very limited amount (...) (24 years ago, 5-Apr-01, to lugnet.robotics)
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| | Re: How about ideas for new elements?
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(...) I think a sub group for 'modifiers' is a good idea. I haven't cut up any pieces myself, broken loads, but never sawn any up. What I will admit to is strenghtening parts, particulary universal joints. I bind the ends with sellotape as the (...) (24 years ago, 5-Apr-01, to lugnet.robotics)
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| | Re: I wish Lego made an "Anti-Backlash Gear"
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cool idea..... (...) (24 years ago, 5-Apr-01, to lugnet.robotics)
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| | Re: I wish Lego made an "Anti-Backlash Gear"
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As this discussion grows, I submit: (that) Part of the problem with Mechanical flex, Gear "Backlash" if you will, Derives from many aspects when we model maximun preformance from Axles, Gears, and all the elements combined to produce desired (...) (24 years ago, 5-Apr-01, to lugnet.robotics, lugnet.technic)
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| | legs anyone?
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Hello all- has anyone worked on a biped-type robot? I've got my class working on making a leg & hip system right now. They are making knees and ankles and gearing the hip to throw weight forward so that the robot walks. Any photos of existing (...) (24 years ago, 5-Apr-01, to lugnet.robotics)
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| | robotica on TLC
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After seeing all the commercials for the past couple of weeks, I was looking forward to this show on TLC called "Robotica". What a disappointment. Where were the robots? They kept talking about robots the whole time. Maybe I'm missing something (...) (24 years ago, 5-Apr-01, to lugnet.robotics)
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| | Re: robotica on TLC
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I share your frustration and agree, they are by no means robots. Are remote controlled planes, boats and cars robots? I have watched BattleBots a few times but got bored with it for similar reasons. The unfortunate thing is that your typical couch (...) (24 years ago, 5-Apr-01, to lugnet.robotics)
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| | Advanced Control strategies
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We are trying to implement advanced control strategies in RCX robots, as neural networks and fuzzy logic. But I think the NQC don't has what we need, as arrays (memory allocation) and aritmetic functions (sigmoid logist for example). Does any one (...) (24 years ago, 5-Apr-01, to lugnet.robotics)
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| | Re: Advanced Control strategies
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Hi Mauro, I think what you're looking for is legOS. You can find it here : (URL) can't imagine a more appropriate place to ask such questions then this site ! Rainer (...) (24 years ago, 5-Apr-01, to lugnet.robotics)
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| | RE: robotica on TLC
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I share you pain. These are not, by true definition, robots. When they require a robot to be autonomous then I will take notice. I know our robotics competition here at the college specifically states that the robots must be autonomous. What I (...) (24 years ago, 5-Apr-01, to lugnet.robotics)
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| | Re: Lubricating technic turntables
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Hey! Some lubricant's are especially made for lubricating thin latex night wear that I won't mention since this is a family news station... Let's just say the latex thingie is used to keep the number of kidos down. But I bet the clerks will wrinkle (...) (24 years ago, 5-Apr-01, to lugnet.robotics)
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| | RE: legs anyone?
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Jim, I would love to see what you have done so far. Do you have anything online? I am looking for a project for my students, but am not sure they could handle this one. Steven B. Combs, MS, CIT Associate Professor - Instructional Technologist Ivy (...) (24 years ago, 5-Apr-01, to lugnet.robotics)
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| | Re: Lubricating technic turntables
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I have a few opinions on the lubrication issue: 1. I would be wary of anything water-soluble/organic as it might grow mold etc and perhaps start to smell. Leave some out for a week or two and give it the 'nose' test before using. 2. Even though (...) (24 years ago, 5-Apr-01, to lugnet.robotics)
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| | Re: I wish Lego made an "Anti-Backlash Gear"
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There is one real simple way to eliminate backlash: Use LEGO's 'small-link chain' with their normal gears as sprockets. I paid CAN$7.00 for 135 links from Pitsco-Dacta's Canadian vendor. There is absolutely NO backlash. Mind you, the gearing problem (...) (24 years ago, 5-Apr-01, to lugnet.robotics, lugnet.technic)
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| | Re: I wish Lego made an "Anti-Backlash Gear"
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(...) You're kidding, right? It's almost impossible to build a geartrain using the chain that doesn't have tons of reversal delay. The links seem to be designed in such a way that they don't work well with technic beams and gears. I always have (...) (24 years ago, 5-Apr-01, to lugnet.robotics, lugnet.technic)
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| | Re: robotica on TLC
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(...) [snip] Indeed! They are not by ANY definition robots. When I saw the spots a long time ago on TLC hinting at a new robotics competition, I visited the site and signed up. I actually spent a fair amount of time jumping through strange hoops, (...) (24 years ago, 5-Apr-01, to lugnet.robotics)
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| | Re: I wish Lego made an "Anti-Backlash Gear"
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Dean, it's probably dumb luck that the two drives on the piece I'm working on have little slack. Yet, with LEGO beams and blocks you can't use every gear combination; there are published beam/block/plate combinations that let this or that pair of (...) (24 years ago, 5-Apr-01, to lugnet.robotics, lugnet.technic)
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| | Re: I wish Lego made an "Anti-Backlash Gear"
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(...) If you use a tensioner arrangement, then it works OK. I haven't really played around with much more than simple weight tensioners (mostly for conveyer use...the catapilar treads are great for that!), but imagine you could come up with a (...) (24 years ago, 5-Apr-01, to lugnet.robotics, lugnet.technic)
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| | Re: I wish Lego made an "Anti-Backlash Gear"
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(...) Believe me that I have tried a lot of combinations. Also your and my idea of "little slack" may be quite different. But it is true that I have never done an exhaustive study on the subject. I usually just give up on getting it perfect and rig (...) (24 years ago, 5-Apr-01, to lugnet.robotics, lugnet.technic)
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| | Re: robotica on TLC
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I think it would be a much more painful experience to watch autonimous robots out there bashing away at each other. Both from an entertainment and philosophical level. From an entertainment standpoint, I imagine it would be painfully dull. Given the (...) (24 years ago, 5-Apr-01, to lugnet.robotics)
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| | Re: robotica on TLC
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I came here to post about Robotica, but I should've known it was done already! But I'll still discuss it:) Dean, I agree completely. This is for entertainment, and not just entertainment for robotic designers, but for the public. I actually like (...) (24 years ago, 6-Apr-01, to lugnet.robotics)
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| | RE: I wish Lego made an "Anti-Backlash Gear"
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(...) It's not the unit price, but the primary motivation for Lego products: It's a toy for kids. Yes, it has found some applications in education and amateur robotics, but it's still a toy. To build exact mechanisms, you not only have to deal with (...) (24 years ago, 6-Apr-01, to lugnet.robotics)
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| | Re: robotica on TLC
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(...) I think that's a bit extreme...but I think it would be quite hard to televise. a *real* robotic challenge. (...) Yes. Also, you'd need ways to make the two robots mutually detectable - a big IR emitter on top of each one...but to make it a (...) (24 years ago, 6-Apr-01, to lugnet.robotics)
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| | RE: robotica on TLC
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I must sadly agree with you, Steve... Though what Dean suggests would bring some real technological ingenuity to a drab genre, no fully-autonomous robotic device is going to beat a human-controlled telerobotic device for quite some time. [And I will (...) (24 years ago, 6-Apr-01, to lugnet.robotics)
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| | Re: robotica on TLC
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(...) GPS wouldn't work. Even though the government disabled Selective Availability last year, commercial GPS still doesn't achieve an accuracy better than several meters. I would imagine that for GPS to be suitable in such a competition, it would (...) (24 years ago, 6-Apr-01, to lugnet.robotics)
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| | Re: I wish Lego made an "Anti-Backlash Gear"
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Listen guys, I'm not playing around with a "Building toy" here, look, (URL) working - creating on this scale, you begin to demand the highest preformance from all aspects of Lego. Eric "Legomaster" Sophie (...) (24 years ago, 6-Apr-01, to lugnet.robotics)
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| | Re: Lubricating technic turntables
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(...) small (BANGS HEAD) THAT WAS IT!!! lithium grease. man oh man why couldn't i think of that. it evens quiets things very well. mike "hitting his head" fusion (24 years ago, 6-Apr-01, to lugnet.robotics)
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| | Re: robotica on TLC
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(...) Differential GPS (where you add a 'ground station') gives you plenty of precision - even without the low order bit scrambling thing. It's not good for telling you where you are relative to the planet - but relative to the ground station, it (...) (24 years ago, 6-Apr-01, to lugnet.robotics)
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| | Re: robotica on TLC
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(...) Even without that, it helps. My 10 year old son used to tell the kids at school that he built Lego robots that could really drive around and do things and the other kids would roll their eyes and mouth "Geek...Nerd..." etc. Now they are *VERY* (...) (24 years ago, 6-Apr-01, to lugnet.robotics)
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