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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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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...
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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...
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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...
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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...
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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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(...) ... (...) 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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(...) 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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(...) 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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(...) 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...
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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...
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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...
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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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(...) 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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