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(...) I have three of these pulleys, and they're all too tight to allow any slipping at all. Maybe when they're a little older they'll function more like you're suggesting. Daniel Segel -- "Ich bin ein Geleeschaumgummiring." daniels@netcom.com (25 years ago, 24-Jan-00, to lugnet.robotics)
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| | Friction Pulley question
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This pulley was mentioned in Dave Baun book (scanbot, page 167). Did anybody use the friction pulley from mindstorms kit to do connect 2 axles? It has a cross hole on one end and a rubber ring in the other that seens to fit an axle. It seens it (...) (25 years ago, 24-Jan-00, to lugnet.robotics)
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| | Re: Friction Pulley question
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(...) The rubber ring grips the stud on the micro motor. You can then use it as a pulley or to connect an axle to the micro motor. They appear to grip tightly enough that they never slip within the torque range of the micromotor. Don't worry about (...) (25 years ago, 24-Jan-00, to lugnet.robotics)
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| | Re: Friction Pulley question
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"Daniel A. Segel" <lego-robotics@crynwr.com> wrote in message news:4.2.0.58.200001...com.com... (...) I thought about that too. If you use if with after some gear reduction instead of attaching directly to the motor axle it may work. I'm trying to (...) (25 years ago, 24-Jan-00, to lugnet.robotics)
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| | Re: Friction Pulley question
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(...) Of the three I have, two grip too well, and one slips quite nicely (too nicely in some cases.) I don't know, maybe I added a little fingerprint lubricant to it. For the other two, I found a quick and easy way to add some slip: insert one or (...) (25 years ago, 24-Jan-00, to lugnet.robotics)
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| | RE: Friction Pulley question
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I doubt that the pulley gear with the rubber insert is meant for slipping. I think it's rather the opposite - provide a firm grip on an axle so that it won't slip sideways. That's important for the micromotor - it only has a very short stub axle. To (...) (25 years ago, 24-Jan-00, to lugnet.robotics)
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| | Re: Friction Pulley question
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(...) I think they would have designed the micro motor differently if they didn't want it to slip. ___...___ You hear, O LORD, the desire of the afflicted; you encourage them, and you listen to their cry --Psalms 10:17 (25 years ago, 24-Jan-00, to lugnet.robotics)
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| | RE: Friction Pulley question
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(...) Interesting point. This got me thinking... Lego almost never provides instructions for the "proper" use of pieces. Most of the time it's not needed, and wouldn't fit with the Lego philosophy of being creative and using your imagination. But (...) (25 years ago, 24-Jan-00, to lugnet.robotics)
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| | Re: Friction Pulley question
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(...) My experience: Sample size = 3, number of tests >= 5 each last night. Results: Unit 1: Micro motor stalls before pulley slips. Unit 2: Micro motor stalls before pulley slips. Unit 3: Pulley slips before motor stalls. So based on my evidence, (...) (25 years ago, 24-Jan-00, to lugnet.robotics)
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| | RE: Friction Pulley question
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(...) ... (...) You can use the pulleys as one stage of the gear reduction setup without using any or minimal additional space. Use a small bushing for the input. Put it as close to the motor as possible. Or you could go from a small bushing to a (...) (25 years ago, 24-Jan-00, to lugnet.robotics)
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| | Re: Friction Pulley question
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Unfortunatelly I don't have a clutch gear. It's hard to find and I can't order kits with it outside US. :( Pulleys and clutch gears can solve the problem but they requires more space. I really don't know if the friction pulley was designed for that (...) (25 years ago, 24-Jan-00, to lugnet.robotics)
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| | Re: Friction Pulley question
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I found a way to "regulate" the friction in the friction pulley. The point is that the axle doesn't need to be inerted all the way inside the rubber ring. You can insert it just a little and use small bushings to keep things in place. I used this to (...) (25 years ago, 29-Jan-00, to lugnet.robotics)
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