 | | Motor Technique
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Here are some pics of a technique I've used for many years, driving a technic axle from a 12V train motor: (URL) the advent of the RC Car motor, this was the most power that could be obtained from a single LEGO motor and used on a Technic axle, 12V (...) (19 years ago, 11-Jun-06, to lugnet.technic, lugnet.robotics, lugnet.announce.moc, lugnet.loc.uk)
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| | Rotation Sensor Accuracy [was Re: Newbie needs Help (diff sensor)]
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Steve wrote on Tuesday, June 06, 2006 5:59 PM <<snip>> (...) <<snip>> I think what is really meant is that most RCX firmware implementations are poor at filtering hardware transient errors. And the Rotation sensor is very "good" at generating (...) (19 years ago, 8-Jun-06, to lugnet.robotics)
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| | Re: NBC News for NXT
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(...) The source code is not yet available because it is not ready to released. At the moment it is extremely ugly Delphi code. I am in the process of refactoring things, re-writing the parsing code, adding a built-in preprocessor, and generally (...) (19 years ago, 8-Jun-06, to lugnet.robotics)
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| | Re: NBC News for NXT
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(...) Higher-level languages are in the works. Exactly how close we are is hard to say. John Hansen (19 years ago, 8-Jun-06, to lugnet.robotics)
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| | Re: NBC News for NXT
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(...) I looked over the doc and it looks pretty interesting. Perhaps I'm not looking in the right place, but I couldn't find the source code. Is it available yet, or tangled up in a Lego NDA? -dave (19 years ago, 7-Jun-06, to lugnet.robotics)
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| | Re: Newbie needs Help
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(...) I'm with you until we get here. Attaching at the front of a long nose feels like a bad idea. Any side force on the tow rope will tend to pull the robot off course, and once slightly off course the force only gets worse. In any case, a (...) (19 years ago, 7-Jun-06, to lugnet.robotics)
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| | Re: NBC News for NXT
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(...) So... How close are we to having a higher-level language based on this (something with syntax close to C)? Is that in the works? (19 years ago, 7-Jun-06, to lugnet.robotics)
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| | Re: NBC News for NXT
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I really thought the NXT was going to be on network TV. hmm. Steve (19 years ago, 7-Jun-06, to lugnet.robotics)
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| | NBC News for NXT
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Over the weekend I got my new Mac Mini G4 up and running, installed lots of development tools, copied over my NBC sourcecode and managed to build a working version of the NBC compiler for the NXT brick. I will have a zip containing the Mac version (...) (19 years ago, 7-Jun-06, to lugnet.robotics)
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| | Re: Newbie needs Help (diff sensor)
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(...) I'll get to that, eventually... there's just too much fun stuff going on, and... (...) A historical point on this. The first time I met Steve was at a sumo event, where I had carefully calculated the correct gear ratio, given the torque of a (...) (19 years ago, 7-Jun-06, to lugnet.robotics)
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| | Re: Newbie needs Help (diff sensor)
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(...) Not so obvious. If you increase the surface the pressure per surface unit decreases proportionnaly (at least on hard surface)... Actually I would expect little or no variation in traction power. Philo (19 years ago, 7-Jun-06, to lugnet.robotics)
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| | Re: Newbie needs Help (diff sensor)
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(...) Hmmm - that's unfortunate...but if the 'right' strategy is to go with a non-slipping robot, the measurement of sliption is really a lot less important. (...) Yeah - so many of those basic mechanics equations are only approximations - yet they (...) (19 years ago, 7-Jun-06, to lugnet.robotics)
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| | Re: Newbie needs Help (diff sensor)
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(...) hmm. This sounds like a good project... (...) All things being equal, I'd put my money on the robot with ten spinning wheels, over a couple (or even ten) stationary ones. I'd also mechanically connect all the motors together, so they drive a (...) (19 years ago, 7-Jun-06, to lugnet.robotics)
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| | Re: Newbie needs Help (diff sensor)
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(...) As you note in your mini-cooper example, *if* you can keep the wheels from "spinning out", but instead are always in rolling contact with the ground, static friction is what's important... and generally, the static coefficient of friction is (...) (19 years ago, 7-Jun-06, to lugnet.robotics)
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| | Re: Newbie needs Help
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(...) That makes sense. (...) Yeah - I agree. So we have to sum some force vectors here. If our robot is pulling to the left, we have a horizontal 'drive' force to the left and a force in the tow rope going off to the right - plus a force due to (...) (19 years ago, 7-Jun-06, to lugnet.robotics)
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| | Re: Newbie needs Help
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(...) Dave, Actually I am very happy and grateful. I am getting a crash course. Couldn't have asked for more. Raj. (19 years ago, 7-Jun-06, to lugnet.robotics)
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| | Re: Newbie needs Help
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(...) Steve Hassenplug, Sorry, my mistake. Thank you for the Wiki link and all your help. Raj. (19 years ago, 7-Jun-06, to lugnet.robotics)
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| | Re: Newbie needs Help (diff sensor)
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(...) The problem is that this is measuring the static friction ("stiction"). That's the wrong thing to measure if your strategy is to jam all the motors full on and progress forwards (we hope!) with all wheels spinning. To measure the dynamic (...) (19 years ago, 7-Jun-06, to lugnet.robotics)
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| | Re: Newbie needs Help (diff sensor)
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(...) I would have expected that compression would be a good thing because it would increase the area of the 'contact patch' - which increases traction - which is a good thing - right? (19 years ago, 7-Jun-06, to lugnet.robotics)
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| | Re: Newbie needs Help (diff sensor)
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(...) A rather inventive young man that I know did try exactly that - using the ribbed tubing from the Mindstorms set inside the Mindstorms motorcycle tire. It's a good fit, and a good idea, but I'm not sure how effective it was. (...) One simple (...) (19 years ago, 7-Jun-06, to lugnet.robotics)
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