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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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| | Re: Please help me identify this brick!
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(...) Aha many thanks! That also explains what the black and white striped discs are for! I'll have to keep an eye out for the 'control panel' thing on ebay! Cheers, -Mat (15 years ago, 20-Jan-10, to lugnet.technic)
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| | Re: Please help me identify this brick!
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(...) Yes, it's a 4.5V part, incuded in some education sets, see (URL) be used as a rotation sensor with this disc: (URL) (15 years ago, 20-Jan-10, to lugnet.technic)
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| | Question about gearing Power Functions-based trains
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I've noticed that because the Emerald Night's two sets of driver wheels are locked together, the engine struggles to go around corners: the outer wheels have further to turn, so the wheels slip and the engine's movement becomes jerky. Would it be (...) (15 years ago, 19-Jan-10, to lugnet.trains, lugnet.technic, lugnet.robotics, FTX)
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| | Some help or advice requested
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Hi all. I am currently working on a project (to be revealed in due course!) and I've come across something of a stumbling block. I have a tray that is constrained to move in one dimension, and a series of short liftarms under the tray, all rotating (...) (15 years ago, 19-Jan-10, to lugnet.technic)
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| | Re: Please help me identify this brick!
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(...) (URL) a bit early for Mindstorms. I've only got a passing familiarity with the 4.5v system, but I believe that any parts that feature that type of 3-prong socket are designed for 4.5v power. All Mindstorms parts use either the 2x2x2/3 electric (...) (15 years ago, 19-Jan-10, to lugnet.technic)
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| | Please help me identify this brick!
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Hi, I've got a black 3x2 block in my large mixed box of Technic, but I'm not sure what it does! The block has a power cable socket in the top, and a smooth axle hole through it, as well as a smaller hole on one side. I've looked through the various (...) (15 years ago, 18-Jan-10, to lugnet.technic)
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(URL) Hi folks Last fall we had the swine flu outbreak - it spread here too, of course, and I fell ill too. While my symptoms remained vague, I was in bed for a week. And one week in bed tends to be kind of boring. So I took my brick boxes onto a (...) (15 years ago, 17-Jan-10, to lugnet.technic, lugnet.cad, FTX)
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| | Re: Volunteers to build and test twin stick transmission?
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(...) More pictures and LDraw file are now available. (URL) (15 years ago, 11-Jan-10, to lugnet.technic, FTX)
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| | Non-standard uses for parts
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(...) A corollary to this (that I discovered yesterday - apologies if this is already well known) is that you can use a bushing to lock a driving ring to the axle - the same notches that allow the bushing to fit between four studs will act as the (...) (15 years ago, 9-Jan-10, to lugnet.technic, FTX)
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| | Re: Volunteers to build and test twin stick transmission?
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(...) Hi Ari, I'd love to build it. No lack of necessary parts here. Could you post (or send me) a copy of the LDraw file you took that screenshot from? Never mind if it's incomplete. It's just easier to build if I can see it from different angles. (...) (15 years ago, 7-Jan-10, to lugnet.technic, FTX)
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Hi, here is an idea to build a good old fashioned twin stick truck transmission. I don't have enough synchro parts so I can't build this myself. Is there any volunteers to build and test it? :) (URL) Schematics> (URL) Twin Stick 5x4> More accurate (...) (15 years ago, 7-Jan-10, to lugnet.technic, FTX)
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