 | | Received my RIS 2.0 - the two motors run at different speed! :-(((
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Hello all, I opened the box of my first Mindstorms set yesterday, and it came with two motors that are slightly different from the usual motors I have, they are much lighter, have notches, and sound differently than normal geared down motors (such (...) (22 years ago, 11-Jan-03, to lugnet.robotics)
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| | Re: Received my RIS 2.0 - the two motors run at different speed! :-(((
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(...) Yes - they've recently changed the design slightly - you should check the mailing list archives - there has been a lot of discussion about this. (...) Motors don't all run at the same speed - that's a given - and you have to design your robot (...) (22 years ago, 11-Jan-03, to lugnet.robotics)
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| | Re: Received my RIS 2.0 - the two motors run at different speed! :-(((
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(...) It's definitely higher than 10%. When my rover is running far enough, it's turning right enough to form a triangle whose side ratio is about 1 length for every 6 traveled, so it's somewhere between 15% and 20% difference. I will call Lego (...) (22 years ago, 11-Jan-03, to lugnet.robotics)
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| | Re: Received my RIS 2.0 - the two motors run at different speed! :-(((
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(...) Is it? Did you do the math or are your just guessing? There isn't enough information to figure the math from what you've told us... It depends on how wide your robot is and what units that triangle is in (feet? meters? miles?). But let's make (...) (22 years ago, 11-Jan-03, to lugnet.robotics)
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| | Re: Received my RIS 2.0 - the two motors run at different speed! :-(((
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First of all, let me say that I very much appreciate your deep insight and your math formulas, which I have forgotten years ago. :) After further testing and measuring, I found that the difference is much larger - it actually deviates a good one (...) (22 years ago, 11-Jan-03, to lugnet.robotics)
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| | Re: Received my RIS 2.0 - the two motors run at different speed! :-(((
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Hi Stéphane, You may have a look to this thread ((URL) and especially Tobbe Arnesson message ((URL)I opened the box of my first Mindstorms set yesterday, and it came with two (...) (22 years ago, 11-Jan-03, to lugnet.robotics)
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| | Re: Received my RIS 2.0 - the two motors run at different speed! :-(((
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(...) OK - so...doing the math carefully and explaining how I did it... 1m ______ E | *\ | * \ | * \ 3m | * \ | * \ |* \ |___...___\C S P * == The curved path taken by the robot. S == The start point of the robot. E == The end point of the robot C (...) (22 years ago, 11-Jan-03, to lugnet.robotics)
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| | Re: Received my RIS 2.0 - the two motors run at different speed! :-(((
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(...) Once again, thanks for making all the calculations for me... Anyway, at the very least, I'll test all four of my other regular gear motors in a mindstorms robot. If I'm lucky to find a pair that are of equal speed, I'll use them in my (...) (22 years ago, 12-Jan-03, to lugnet.robotics)
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