 | | Re: I wish Lego made an "Anti-Backlash Gear"
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(...) Looks like toys to me. Really incredibly cool toys! Tilman's post supporting my "Toy" claim mentioned how torsionally flimsy the technic axles are. This could be used to take the backlash out of a gear train. Pull out four 48 tooth gears, two (...) (24 years ago, 6-Apr-01, to lugnet.robotics)
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| | Re: robotica on TLC
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(...) I agree that fully autonomous robots wouldn't stand much of a chance. But I think it would be possible to create some rather impressive 'bots that used on board intelligence in conjunction with input from a human operator. (...) My favorite (...) (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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| | 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: 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: 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: 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: 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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(...) 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: 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 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: 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: 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: 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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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: 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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(...) 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: 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: 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: 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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