 | | Rolling ball clock revisited —Philippe Hurbain
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| | | I finally rebuilt (URL) Bob Kojima's rolling ball clock> with RCX control (and other minor modifications) (URL) Description of these modifications, program, photos, videos are (URL) here> Special thanks to Bob for the time spent to LDraw his (...) (20 years ago, 7-Dec-04, to lugnet.announce.moc, lugnet.technic, lugnet.robotics, FTX)
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| | | | | Re: Rolling ball clock revisited —Bob Kojima
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| | | | | i have been waiting to see if some one would put my LDraw files to go use. i see many good modifications too! i will have to go home and try some of these modifications to my clock. i especially like the fix to prevent 2 balls form lifting, the ball (...) (20 years ago, 7-Dec-04, to lugnet.technic, lugnet.robotics)
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| | | | | | | Re: Rolling ball clock revisited —Philippe Hurbain
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| | | | | | (...) Thanks, Bob! I hope you'll get as much pleasure building my arm as I got building your clock... Philo (20 years ago, 8-Dec-04, to lugnet.technic, lugnet.robotics)
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| | | | | Re: Rolling ball clock revisited —David Koudys
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| | | | | (...) I love it! Very nicely done! It was interesting to read this bit off your website-- " The problem should have been very simple: each minute, start the elevator until a ball is detected by one sensor. Unfortunately, my first try over a several (...) (20 years ago, 7-Dec-04, to lugnet.technic, lugnet.robotics, FTX)
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| | | | | | | RCX has a fast clock, was Re: Rolling ball clock revisited —Philippe Hurbain
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| | | | | | Hello dave, (...) A made an experiment this night using a RCX 2.0, the clock was fast by about 10s per hour. I suppose that this problem comes from bad capacitor loading of the crystal used on RCX. Crystals need to see some capacitance to oscillate (...) (20 years ago, 8-Dec-04, to lugnet.technic, lugnet.robotics)
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| | | | | | | | Re: RCX has a fast clock, was Re: Rolling ball clock revisited —Philippe Hurbain
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| | | | | | (...) As David Ward suggested me, the oscillator is most probably equipped with a ceramic resonator with built-in capacitors. This explains the low precision of the clock (tolerance for ceramic resonators is in the 1% range while for crystals it is (...) (20 years ago, 8-Dec-04, to lugnet.technic, lugnet.robotics)
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| | | | | Re: Rolling ball clock revisited —Matt Lawrence
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| | | | | (...) You mean the RCX doesn't speack NTP. How primitive! -- Matt Nothing great was ever accomplished without _passion_ (20 years ago, 7-Dec-04, to lugnet.robotics)
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| | | | | Re: Rolling ball clock revisited —Rob Hendrix
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| | | | "Philippe Hurbain" <philohome@free.fr> wrote in message news:I8CKBA.152q@lugnet.com... (...) Awesome work, both of you! As for the mechanism occasionally not picking up a ball: Instead of having the bucket grab a ball from the bin, why not have a (...) (20 years ago, 7-Dec-04, to lugnet.technic, lugnet.robotics)
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| | | | | | Re: Rolling ball clock revisited —David Eaton
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| | | | (...) So, what exactly is a gravity tube? Maybe you mean something like: Empty Full Half-full | | |o| | | | | |o| | | | | |o| |o| | |___ |o|___ |o|___ |_____ |o____ |o____ Hence, when a ball comes in (from bottom right of the tube), it pushes a ball (...) (20 years ago, 7-Dec-04, to lugnet.technic, lugnet.robotics)
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| | | | | | Re: Rolling ball clock revisited —Rob Hendrix
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| | | | "David Eaton" <deaton@intdata.com> wrote in message news:I8DHDr.u1s@lugnet.com... (...) Not exactly what I was thinking, but you're close. If you stick your bendy straw in your 1/2 pint chocolate milk and then turn it upside-down, that's more of (...) (20 years ago, 7-Dec-04, to lugnet.technic, lugnet.robotics)
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| | | | | | Re: Rolling ball clock revisited —Philippe Hurbain
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| | | | | Hi Rob, (...) I tried a similar mechanism (a large inclined plane with a width reduction in the end), the problem is that LEGO balls are somewhat rough, and they tend to form a locked arch above width shrinking. I even tried to add a stirring (...) (20 years ago, 8-Dec-04, to lugnet.technic, lugnet.robotics)
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| | | | | | The Great Ball Contraption (was Re: Rolling ball clock revisited) —Steve Hassenplug
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| | | | (...) This announcement isn't quite ready, but while we're on the subject of rolling [soccer] balls, I figured I'd leak out a bit of info. We're working on a standard (currently in testing) for modules for "The Great Ball Contraption." Think Rube (...) (20 years ago, 8-Dec-04, to lugnet.technic, lugnet.robotics)
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| | | | | | Re: The Great Ball Contraption (was Re: Rolling ball clock revisited) —Brian Davis
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| | | | | (...) One thing Steve forgot - think constant noise. Constant, *constant* noise. But it is a lot of fun... (20 years ago, 8-Dec-04, to lugnet.technic, lugnet.robotics)
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| | | | | | Re: The Great Ball Contraption (was Re: Rolling ball clock revisited) —Philippe Hurbain
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| | | | (...) Looks fun ;o) One of my goals when building Bob's clock was to get my feet wet in ball moving... One foreseeable issue: if an upstream unit has more throughput than a downstream one, we shall get ball overflows! Philo (20 years ago, 9-Dec-04, to lugnet.technic, lugnet.robotics)
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| | | | | | Re: The Great Ball Contraption (was Re: Rolling ball clock revisited) —Steve Hassenplug
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| | | | (...) There will be a minimum throuhgput to solve that. Right now, we're testing with 1 ball/second. So, the very first module will be regulated to run somewhere just below that speed. As long as everyone else can meet the minimum, there will be no (...) (20 years ago, 9-Dec-04, to lugnet.technic, lugnet.robotics)
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