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Hi, I´m tring to build a robot that may use a caster wheel, But i am running some serious problemes in it design. If I use an axle or pin for the caster, it will bend. (the robot is quite heavy). So i tried to use a turntable as a caster axle, but (...) (20 years ago, 30-Mar-05, to lugnet.robotics)
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| | Re: caster wheel design
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(...) How heavy is this? A caster needs an offset, but making this offset as small as possible should reduce bending. I usually use a medium pulley on a #3 axle; either end of the axle is held in the pin hole of a Technic crossblack, while short (...) (20 years ago, 30-Mar-05, to lugnet.robotics)
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| | Re: caster wheel design
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If you are planning on running on smooth surfaces, you might be suprised at how well your robot drives and turns with just one of those domed 2x2 'gliders' instead of a wheeled caster. ---...--- Steve Baker ---...--- HomeEmail: (...) (20 years ago, 30-Mar-05, to lugnet.robotics)
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(...) Move the other wheels or the CG so that the caster doesn't support much weight. No matter what your design, a caster that carries a lot of weight will not work well. The large turntables will have a lot of friction when carrying a lot of load. (...) (20 years ago, 30-Mar-05, to lugnet.robotics)
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| | Re: caster wheel design
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(...) Another "microcaster" is the style used in "ERBIE the Robocar" discussed here (URL) made with a 2x2 turntable, a 2x3 plate, and a single wheel (URL) works surprisingly well, so long as 1) The weight isn't huge and 2) the surface isn't too (...) (20 years ago, 30-Mar-05, to lugnet.robotics)
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(...) You can actually do that one better - use a 2x2 plate with offset wheel holder on the bottom, & you can dispense with the 2x3 plate. I browsed Peeron & Bricklink and couldn't locate it, but they're handy for microcasters. (20 years ago, 31-Mar-05, to lugnet.robotics)
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| | Re: caster wheel design
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(...) This the one you mean? (URL) (20 years ago, 31-Mar-05, to lugnet.robotics)
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(...) heck I ended up with any of them. They work great however. (20 years ago, 31-Mar-05, to lugnet.robotics)
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| | Re: caster wheel design
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I had a similar problem once, when my Cybot had a broken castor - I found that the Lego axle made a snug fit in the cavity intended for it - however it was bending and under a lot of tension. My solution was to use axle-joiners((URL) and 2 unit long (...) (20 years ago, 31-Mar-05, to lugnet.robotics)
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| | Re: caster wheel design
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Thanks everybody for the answers, but i think i will give up with the caster... The robot will be very heavy... i think it wont work.. I will go to a synchro drive aproach... Thanks. Patrick "Patrick Levy" <omiccron@uol.com.br> escreveu na mensagem (...) (20 years ago, 31-Mar-05, to lugnet.robotics)
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| | RE: caster wheel design
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On this topic, I know it's been asked before, but... Is there a formula for the optimal offset of the caster wheel's axle from the pivot point? BTW, the relatively new 3u pin without friction ((URL) plus the freestyle wheels ((URL) or model team (...) (20 years ago, 1-Apr-05, to lugnet.robotics)
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| | RE: caster wheel design
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Patrick, Somewhere floating around on my computer is a cad drawing with instructions of a synchro drive that I built a couple years ago. If you are interested in them, I could find them and put them on my website for you to look at. Scott (...) (20 years ago, 1-Apr-05, to lugnet.robotics)
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| | Re: caster wheel design
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I will apreciate it a lot, Thanks Patrick "Scott Davis" <lego-robotics@crynwr.com> escreveu na mensagem news:BAY102-DAV14BCA...phx.gbl... (...) instructions (...) Of (...) (20 years ago, 1-Apr-05, to lugnet.robotics)
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