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(...) (URL) (...) (URL) (...) Kevin (15 years ago, 26-Jan-10, to lugnet.technic)
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(...) <snip> (...) I've got a slightly different solution, where the tray tips an inverted pendulum right and left. The pendulum's momentum/weight flip the polarity reverser. The tri-blade bounds the inverted pendulum's swing. The first three steps (...) (15 years ago, 26-Jan-10, to lugnet.technic)
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(...) You're quite right in that there's nothing in the pictures to suggest that having the having the motor running after the tray reaches its stop would be a bad idea. However, that would be disastrous for the rest of the machine - think of a (...) (15 years ago, 25-Jan-10, to lugnet.technic)
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(...) ... (...) Well, seeing your pictures, I can't help wondering: do you actually need the tray to change direction as soon as it hits the end? If not, you can use a much easier solution: just power its motor for a given amount of time in one (...) (15 years ago, 25-Jan-10, to lugnet.technic)
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(...) Ok, so I have something that appears to do what I need it to do, however, it is a bit of a monstrosity, and I think that it shows either that I am a genius, or a madman - I'm not sure which! Bear in mind that this still includes several quick (...) (15 years ago, 25-Jan-10, to lugnet.technic)
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(...) Last year I built a pneumatic excavator module for a GBC display exactly for this reason: doing it with an RCX would have been like cheating when it could be done mechanically :D As for your 'problem', I've been turning this over in my mind (...) (15 years ago, 23-Jan-10, to lugnet.technic)
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(...) Hmm, an interesting solution. (...) But there's the rub! I'm afraid I can't see an obvious way to do that, given that the weight will need to be positioned quite precisely. I will play around with it, though, and see what I can come up with. (...) (15 years ago, 22-Jan-10, to lugnet.technic)
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(...) <snip> Hi Owen, As you say, you want a mechanism where the switch wants to be either on or off, but not in the middle. Had you thought about adding a pivot point at the top of the switch handle, with an axle going up and a weight at the top. (...) (15 years ago, 22-Jan-10, to lugnet.technic)
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(...) SNIP I don't think there is a 'save' way to do that. In fact thats the reason reversal switches have dead space, because you will short circuit stuff otherwise (might be only for a millisecond though). I don't know if you ever worked with some (...) (15 years ago, 22-Jan-10, to lugnet.technic)
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(...) SNIP (...) I have been asked for some pictures of what I am working on (very much prototypes at the present - don't expect anything elegant). (URL) is the track for the tray, and the drive mechanism. As the axle at the front (bottom) of the (...) (15 years ago, 22-Jan-10, to lugnet.technic)
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