 | | Re: Adder/Subtractor revisited —Johannes Keukelaar
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| | | (...) Right. This is what I was trying to get at. If one motor gives too little power, you can add the power of two together trough a differential. Power the axles of the differential by two different motors, and the added power comes out through (...) (26 years ago, 2-Feb-99, to lugnet.robotics)
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| | | | | Re: Adder/Subtractor revisited —Jim Moran
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| | | | | Ahh, I see. I thought you meant to power the primary diff in the A-S transmission in this fashion. Yes, a third diff coupled carrier-to-carrier with the primary one in the A-S would work. Three diffs ! I don't think I have enough of them to model (...) (26 years ago, 3-Feb-99, to lugnet.robotics)
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| | | | | | | Re: Adder/Subtractor revisited —Jasper Janssen
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| | | | | | (...) 5229 is your friend :) Jasper (26 years ago, 3-Feb-99, to lugnet.robotics)
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| | | | | Re: Adder/Subtractor revisited —Bryan Beatty
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| | | | | (...) I can understand why you'd need a method like this if the two motors were radically different types, but if you're dealing with two identical motors (such as the 9V MindStorms motors), is this really necessary? The tolerances may be a teensy (...) (26 years ago, 4-Feb-99, to lugnet.robotics)
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| | | | | | | Re: Adder/Subtractor revisited —Medical Informatics Consulting
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| | | | | | Well, I don't know about your experiences, but I have had tracked vehicles with identical (as much as possible) construction on each side of the vehicle that deviat several degrees for each foot travelled. This was due to the characteristics of the (...) (26 years ago, 4-Feb-99, to lugnet.robotics)
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| | | | | Re: Adder/Subtractor revisited —David Harry
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| | | | In article <36B6F795.4B9310A6@n...a.kth.se>, johannes@nada.kth.se says... (...) Ingenious as it is, this thread and previous similar ones have pointed out the primary problems with the A-S drive approach: power transmission through the LEGO (...) (26 years ago, 6-Feb-99, to lugnet.robotics)
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| | | | | | Re: Adder/Subtractor revisited —Jim Moran
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| | | | | That sounds very interesting. I hope to see some diagrams or photos soon... Your approach solves the biggest problem introduced by the A-S drive, that of insufficient torque when driving tracks. Two motors is the way to go for tracks. -- SeeYa ! (...) (26 years ago, 6-Feb-99, to lugnet.robotics)
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| | | | | | | Re: Adder/Subtractor revisited —David Harry
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| | | | | | In article <F6psw8.Bxy@lugnet.com>, cyberia@erols.com says... (...) Yes, this is the feature that really worked out well. By changing one gear (and adding appropriate number of 1/3 thickness shim plates under the motor), one can get the following (...) (26 years ago, 6-Feb-99, to lugnet.robotics)
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| | | | | | Re: Adder/Subtractor revisited —Bryan Beatty
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| | | | (...) Actually, I've had pretty good luck with independently driven left and right drive trains; I haven't had a lot of problems with robots curving when I want them to go straight. I find the adder/subtracter useful for a different reason: it makes (...) (26 years ago, 6-Feb-99, to lugnet.robotics)
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| | | | | | Re: Adder/Subtractor revisited —David Harry
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| | | | (...) Here's what I do and it works quite well. I have added a "partial duty cycle" mode to my motor control system. Basically I intermitantly turn off the motor for a very small increment of time. The time-average of a properly synchronized (...) (26 years ago, 7-Feb-99, to lugnet.robotics)
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| | | | | | Re: Adder/Subtractor revisited —Jim Moran
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| | | | | A nit, but you meant 75% duty cycle, no (or reversed your terms) ? -- SeeYa ! ---...--- Jim ---...--- Hello... Is this thing on ? David Harry wrote in message ... (...) (26 years ago, 7-Feb-99, to lugnet.robotics)
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| | | | | | Re: Adder/Subtractor revisited —Bryan Beatty
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| | | | (...) [snip] (...) I actually had already tried that, and couldn't get to work in these particular circumstances. I couldn't get the robot to turn off the motor for any period briefer than 50 ms, and even that short a period (coupled with setting (...) (26 years ago, 7-Feb-99, to lugnet.robotics)
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| | | | | | Re: Adder/Subtractor revisited —Dan B.Brockman
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| | | | There is a company in Chicago that does a lot with small motors; it's named Bodine Electric, and of course they have a web site at (URL) I can tell the motors in the RCX sets operate with pulse width modulation to control power. Bodine's site gives (...) (26 years ago, 7-Feb-99, to lugnet.robotics)
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