 | | **lego motors?** —
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| | | Hi I built a robot and it wont travel straight at equal power levels? Why do I need to set the motors at such different levels to get the bot to travel straight? I am using the click and drag software that came with the rcx. any help much (...) (26 years ago, 12-Apr-99, to lugnet.robotics)
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| | | | | Re: **lego motors?** —S. Crawshaw
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| | | | (...) Quite simply, no two motors run at exactly the same speed for a given power level. (Slight differences in the wheels, or flexibility in the axles will also produce the same effect, although probably much less noticeable) There's no simple (...) (26 years ago, 12-Apr-99, to lugnet.robotics)
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| | | | | | Re: **lego motors?** —Antony Furneaux
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| | | | | Hmmm, Lego gearboxes. I've just spent two weeks playing with different styles off gearbox. I haven't found a good powered solution yet. The problem being that the standard gears just don't mesh nicely enough. Making a gearbox is simple enough and (...) (26 years ago, 12-Apr-99, to lugnet.robotics)
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| | | | | | | Re: **lego motors?** —OneTimeCRX
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| | | | | | | (...) Lego's Super Car (8880) comes with a 4-speed gearbox that uses loosely set cogs to engage an axle to an idler gear (I don't know how else to describe it), which means that one can change gears easily at high rpm and not worry about (...) (26 years ago, 12-Apr-99, to lugnet.robotics)
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| | | | | | | | | Re: **lego motors?** —Antony Furneaux
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| | | | | | | | I haven't got the Super Car 8880 (It came and went in my dark ages, anyone got one for sale in the UK). I think I understand how it works, how small do you think you could make that with RIS parts? I'm looking forward to seeing the new super car's (...) (26 years ago, 12-Apr-99, to lugnet.robotics)
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| | | | | | | | | | Re: **lego motors?** —OneTimeCRX
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| | | | | | | | (...) I don't think that it would take up a lot of space at all. In fact, the largest part should be the motor that is used to engage/disengage the gear. Using a tractor hub, two 16-T gears, and two axles (with other parts to hold this all together, (...) (26 years ago, 13-Apr-99, to lugnet.robotics)
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| | | | | | | Re: **lego motors?** —David Harry
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| | | | | | Check out my "adaptive transmission" LDRAW CAD drawings posted awhile ago on the cad.dat newsgroup. This design largely solves the "go straight" problem. It uses two independent left/right drive trains, interconnected through a single differential (...) (26 years ago, 17-Apr-99, to lugnet.robotics)
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| | | | | | | | Re: **lego motors?** —Mark M Young
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| | | | | | Could you specify a place where these CAD drawings could be obtained for those who don't frequent newsgroups? Mark Young YoungMM@Hera.WKU.edu -- Did you check the web site first?: (URL) (26 years ago, 19-Apr-99, to lugnet.robotics)
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| | | | | | Re: **lego motors?** —Laurentino Martins
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| | | | | I've been thinking in building an automatic gearbox with two speeds. If the motor was making too much strength it would lower the gear, and if it's running too fast it would increase the gear. Is there any design like that already built? Maybe with (...) (26 years ago, 12-Apr-99, to lugnet.robotics)
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| | | | | | | Re: **lego motors?** —Linc Smith
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| | | | | | Laurentino Martins wrote in message <4.1.19990412164203....90.220>... (...) gears, with a rubber band pushing it to one of the sides...? There has been a couple of versions of just what you describe, however I don't have the URLs. Sorry... about (...) (26 years ago, 13-Apr-99, to lugnet.robotics)
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| | | | | | Re: **lego motors?** —Alex Wetmore
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| | | | From: S. Crawshaw <sc10003@eng.cam.ac.uk> (...) (URL) has a few robots which use an adder/subtractor to do this, and there are links to all of the other similar designs on the internet that I am aware of. alex -- Did you check the web site first?: (...) (26 years ago, 12-Apr-99, to lugnet.robotics)
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