 | | Fishing for a tasty linkage/gearing/robotic building thread... —Kipling Morris
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| | | Hi all, I've noticed that it's been awhile since there has been good thread concerning the building of robotic elements in Lego. I have nothing against the really neat conversations concerning the RCX - but- computers are what I do for a living, so (...) (25 years ago, 11-May-99, to lugnet.robotics)
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| | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —David Cuthill
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| | | | | Me too !! Kipling Morris wrote in message ... (...) against (...) I (...) (25 years ago, 12-May-99, to lugnet.robotics)
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| | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —Michael Gasperi
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| | | | | (...) I totally agree about needing a new building thread. It seems like there is a lot of effort for software in a box with only three inputs and three outputs. Whatever turns you on I suppose. We all get enjoyment from this product in different (...) (25 years ago, 12-May-99, to lugnet.robotics)
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| | | | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —Bill Leggett
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| | | | | | | I would try using one motor to drive and a ratchet on one of the wheels. Then when you go in reverse, you turn. Time the motor power setting and turn rate until you get a good 90 degree turn. The other way would be to use some kind of line (...) (25 years ago, 12-May-99, to lugnet.robotics)
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| | | | | | | Re: Right angle turns with parts in the box —Dennis Clark
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| | | | | | | (...) [snip] (...) make (...) Normally I would use the cat-tracks for this, but it wouldn't be a perfect turn there. For a pivot turn, I would use two of the "monster" wheels geared down as they can really rip if you don't! Put skids on the front (...) (25 years ago, 12-May-99, to lugnet.robotics)
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| | | | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —Anders Isaksson
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| | | | | | Michael Gasperi skrev i meddelandet ... (...) Hey, that's almost our (me and my kids) current project! We have Cybermaster, not RIS, but in this case I think the CM is better, as it have the built-in tachometers for the two permanent motors. We (...) (25 years ago, 12-May-99, to lugnet.robotics)
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| | | | | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —Michael Gasperi
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| | | | | | Anders Isaksson <isaksson.etuna@REMO...tninet.se> wrote in message news:FBMxI9.GuC@lugnet.com... (...) the (...) sensors (...) on/off, (...) I realy like the program reading mechanism. Let me know when you have photos. However I probably need more (...) (25 years ago, 13-May-99, to lugnet.robotics)
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| | | | | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —Anders Isaksson
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| | | | | | Michael Gasperi skrev i meddelandet ... (...) An idea we have (but no implementation ideas yet), is to drive the program in discrete 'steps', sampling the sensors during the step, and decide the action. This would make exact turns possible. The main (...) (25 years ago, 13-May-99, to lugnet.robotics)
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| | | | | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —Mario Ferrari
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| | | | | | (...) I like a lot your idea of a "phisical" program stored on a 2 x n plate. You could use one sensor eg on the left side as a sort of "clock" mechanism which marks your steps. Doing so you very precisely know when to read the right sensor which is (...) (25 years ago, 13-May-99, to lugnet.robotics)
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| | | | | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —Paul Speed
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| | | | | | (...) Or third, a synchro drive constrained to a ninety degree throw. This is simpler than the independent wheels since it doesn't require an extra motor or complicated mechanism for raising and lowering. It is also easier than the rotation sensor (...) (25 years ago, 13-May-99, to lugnet.robotics)
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| | | | | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —S. Crawshaw
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| | | | | | | (...) <snip> (...) Surely the only reason there's usually complication is that the assembly needs to be able to rotate any amount in either direction. If 0-90 degrees is the total range, then there are lots of really simple solutions. [This next bit (...) (25 years ago, 13-May-99, to lugnet.robotics)
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| | | | | | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —Paul Speed
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| | | | | | | | | (...) True. The main complication I always had was somehow rotating the assembly around the drive train. As far as I know there are only three ways to do this.... (...) The three ways that I have found are the turntables(really simple), the (...) (25 years ago, 13-May-99, to lugnet.robotics)
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| | | | | | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —Mark Ferris
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| | | | | | | | | (...) I haven't opened the box yet (anticipation is part of the fun), but it looks like there is one in my 8480 Space Shuttle kit. Not that that is really an inexpensive alternative. (25 years ago, 13-May-99, to lugnet.robotics)
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| | | | | | | | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —S. Crawshaw
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| | | | | | | | | | (...) Oh yes, forgot about the Space Shuttle. But it's been discontinued, otherwise I might well have bought one. Stuart -- Did you check the web site first?: (URL) (25 years ago, 13-May-99, to lugnet.robotics)
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| | | | | | | | | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —Alex Wetmore
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| | | | | | | | | | | 8443 has one, and isn't terribly expensive. It has nice pneumatics as well. I bought one on sale from S@H a year or so ago (back when they had good weekly sales on Technic stuff...those days seem to be over). alex ----- Original Message ----- From: (...) (25 years ago, 13-May-99, to lugnet.robotics)
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| | | | | | | | | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —Mario Ferrari
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| | | | | | | | | | (...) The Space Shuttle is still on the shelves here in Italy (but VERY expensive). Other sources for the turntable are the 8460 Pneumatic Crane Truck (off catalog but still easy to find here) and the 8443 Pneumatic Log Loader (on catolg and widely (...) (25 years ago, 13-May-99, to lugnet.robotics)
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| | | | | | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —Wes Matchett
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| | | | | | | | (...) I have a fully functional version that doesn't use either - or any special parts. I wish I had a digital camera to take some decent pictures. I have one photo taken with a Polaroid. I'll put it on my web site tonight. In the mean time, I'll (...) (25 years ago, 13-May-99, to lugnet.robotics)
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| | | | | | | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —Wes Matchett
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| | | | | | | | (...) Here it is as promised: (URL) finally got around to creating a Mindstorms site. Now if I can just work out the details of paying for a digital camera..... -Wes (25 years ago, 13-May-99, to lugnet.robotics)
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| | | | | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —Mario Ferrari
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| | | | | | (...) ... (...) Agree. I didn't think of synchro drive and if you or any other suggested this arrangement to solve this problem I missed that message. It's a very good solution provided that you limit the rotation to 90 degrees with phisical bounds (...) (25 years ago, 13-May-99, to lugnet.robotics)
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| | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —David Warnock
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| | | | | Michael, If you only need to make right angle changes of direction how about a design where the robot does not turn. You could have one set of axles for forward/backward with 1 motor driving both sides so you go straight. Then to change direction a (...) (25 years ago, 12-May-99, to lugnet.robotics)
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| | | | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —Michael Gasperi
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| | | | | | (...) I was toying around with something like this. A foot like thing would come down, lift the whole vehicle up off the ground, then turn it right or left 90 degrees (maybe even a variable angle), and set it back down. It does look like a three (...) (25 years ago, 12-May-99, to lugnet.robotics)
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| | | | | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —Paul Speed
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| | | | | | (...) You could use a synchro-drive type of platform. This has been mentioned on here a few times before with varying levels of complexity. Since you only need 90 degree angles then you could probably get away with synchronizing the wheel direction (...) (25 years ago, 12-May-99, to lugnet.robotics)
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| | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —Michael Gasperi
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| | | | All I can say is that I hope Kipling Morris is happy now and thanks for all the help with my vehicle project. (25 years ago, 13-May-99, to lugnet.robotics)
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| | | | | | Re: Fishing for a tasty linkage/gearing/robotic building thread... —Kipling Morris
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| | | | Michael Gasperi wrote in message ... (...) I _am_ happy :). Nice thread going here! (25 years ago, 15-May-99, to lugnet.robotics)
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