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David Chen writes: > I've been playing with the following design to try to overcome the > problems with getting the robot to drive straight while using an A B > Differential drive train (ie left side wheels driven by motor A, right > side by motor (...) (23 years ago, 11-Jan-02, to lugnet.robotics)
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| | Re: Using the Differential to drive straight.
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I don't have this book yet. Can it be done with parts ONLY from the RIS set? --Jack Gregory Russell Nelson <lego-robotics@crynwr.com> wrote in message news:15423.9463.8629...nwr.com... (...) people (...) following (...) them (...) (23 years ago, 11-Jan-02, to lugnet.robotics)
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| | Re: Using the Differential to drive straight.
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I don't have the book either. Did Mario and Giulio seem to think this selectable torque locking helped in helping a robot travel straighter or turn more consistently? I had initially intended this to be a sort of transmission to give the option of (...) (23 years ago, 11-Jan-02, to lugnet.robotics)
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| | Re: Using the Differential to drive straight.
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I tried both of the drive trains in the Ferrari's book and still had problems getting the robot to to travel a straight line. The design they suggest was a huge improvement over a non-feedback direct differential drive, still I need precision for a (...) (23 years ago, 11-Jan-02, to lugnet.robotics)
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| | Re: Using the Differential to drive straight.
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<snip> (...) </snip> well, you could try the adder/subtractor (shameless plug here (URL) > or i think that i have another idea but i have to build it before i can CAD it so give me a week or so. mike (23 years ago, 14-Jan-02, to lugnet.robotics)
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| | Re: Using the Differential to drive straight.
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(...) Actuially the solution that we describe in our book is similar but not identical to Dave's one. Starting from the well known setup in which a differential gear is used to measure the difference in speed between the main wheels of a (...) (23 years ago, 14-Jan-02, to lugnet.robotics)
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| | Re: Using the Differential to drive straight.
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(...) My implementation did something similar but used the 3rd motor in the OFF (ie. high resitance to turning) setting during turns to make sure that both the A and B side wheels turned the same amount. This helps to make sure that the skid/steer (...) (23 years ago, 15-Jan-02, to lugnet.robotics)
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| | Re: Using the Differential to drive straight.
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Thanks Mike, I'll be sure to try the adder-subtractor, as well as your new device. I completed the prototype of the differential drive with a transmission-lockable axle over the weekend. Actually, I can't claim credit for it, I got the idea from (...) (23 years ago, 15-Jan-02, to lugnet.robotics)
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