 | | Back wheel construction advice
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Does anybody have any good construction ideas for the back wheel of a 3 wheeled robot, the wheel is mainly for balance, and it will have to rotate freely, the front wheels have separate motors so the back wheel is dragged, the robot can rotate (...) (22 years ago, 14-Mar-03, to lugnet.robotics)
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| | RE: Back wheel construction advice
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I have found myself needing a similar freely-rotating wheel, and have had only marginal success with a caster type of arrangement. I've been daydreaming about a ball bearing arrangement (think of a mouse ball) but this would probably take us out of (...) (22 years ago, 16-Mar-03, to lugnet.robotics)
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| | Re: Back wheel construction advice
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Teoman Naskali wrote: > Does anybody have any good construction ideas for the back wheel of a 3 > wheeled robot, the wheel is mainly for balance, and it will have to rotate > freely, the front wheels have separate motors so the back wheel is (...) (22 years ago, 16-Mar-03, to lugnet.robotics)
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| | Re: Back wheel construction advice
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How big is the robot? If we're talking -Lego scale, maybe an actual ball mouse would be an answer - you can get very small ones meant to be used with laptops. Think about it - you're in the right approximate size range AND you get accurate 2-axis (...) (22 years ago, 16-Mar-03, to lugnet.robotics)
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| | Re: Back wheel construction advice
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(...) I disagree. Look more carefully at your mouse. It's weight (and the weight of your hand) is supported by the little plastic feet. The ball rolls on the desktop but it doesn't support any weight. ---...--- Steve Baker ---...--- HomeEmail: (...) (22 years ago, 16-Mar-03, to lugnet.robotics)
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| | Re: Back wheel construction advice
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I have a few caster designs that I like to use. Here are two links to robots that I have designed for a standard robot competition. Both of these use similar caster wheel designs. See steps 13-15 of: (URL) steps 9a and 9b of: (URL) Jansson (22 years ago, 17-Mar-03, to lugnet.robotics)
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| | Re: Back wheel construction advice
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(...) tire. You want the wheel to spin on the spot with minimum friction, so wouldn't you want to use a large pulley with a thin tire? ---...--- Steve Baker ---...--- HomeEmail: <sjbaker1@airmail.net> WorkEmail: <sjbaker@link.com> HomePage : (URL) : (...) (22 years ago, 17-Mar-03, to lugnet.robotics)
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| | Re: Back wheel construction advice
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(...) Sure, you can make a caster with the pulley wheel and thin tire though I think it is a little less elegant. For one thing, since the pulley wheel is only 1/2 unit wide, it will slop around unless you use a longer axle and bushings on the ends (...) (22 years ago, 18-Mar-03, to lugnet.robotics)
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| | New "Designer Sets" such as 4099?
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Are there any new and robotically-useful pieces in the new "Designer Sets" such as 4099, 4100, 4101, etc? (It's a bit hard to tell from the small photos) (URL) CatID=&OrderBy=0 Thanks Bruce (22 years ago, 18-Mar-03, to lugnet.robotics)
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| | Re: Back wheel construction advice
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(...) A better idea yet is to use the pulley wheel without a tire. There is no need for traction in the caster. A hard plastic wheel allows the caster to act like a skid sometimes and minimizes the caster steer experienced when straightening out (...) (22 years ago, 18-Mar-03, to lugnet.robotics)
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| | Re: New "Designer Sets" such as 4099?
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(...) It says: "Sorry, item is not available in this country." What are they? ---...--- Steve Baker ---...--- HomeEmail: <sjbaker1@airmail.net> WorkEmail: <sjbaker@link.com> HomePage : (URL) : (4 URLs) GEEK CODE BLOCK----- GCS d-- s:+ a+ C++++$ (...) (22 years ago, 18-Mar-03, to lugnet.robotics)
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| | Re: New "Designer Sets" such as 4099?
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4099 - Robobots (URL) Maximum Wheels (URL) Wild Collection (...) Mark (NOTE NEW PHONE NUMBERS) Mark Harrison Near markn@scoca-k12.org LAN Manager 800.634.8828 x5300 (Toll Free) 740.289.5300 (Desk) 740.352.9141 (Cell) 740.532.7752 (Home) SCOCA MAIN (...) (22 years ago, 18-Mar-03, to lugnet.robotics)
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| | Re: New "Designer Sets" such as 4099?
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(...) They are sets of basic bricks (no motors) which let you build some interesting things. One is insects with long hinged legs (I think, hard to tell from the photos), there are two robot sets, one with a lot of cool looking blue bits (Eric?), (...) (22 years ago, 19-Mar-03, to lugnet.robotics)
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| | Re: Back wheel construction advice
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Russ. (...) Matthias Jetleb (Jetleb@Netcom.ca) showed a few of us at one of our monthly rtlToronto dinners, something he came up with. I don't have any of the lego CAD products to draw it up. BUT. if I attempt to describe it. He wrapped a lego (...) (22 years ago, 20-Mar-03, to lugnet.robotics)
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