 | | Re: Homing with the IR Tower
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(...) I've built a PC program for the CyberMaster that pools the integrated tachometers continuously and shows the trajectory of the bot in the PC screen. It uses _tracks_, and I've found out that besides one of the tracks runs a bit better than the (...) (25 years ago, 27-Jul-99, to lugnet.robotics)
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| | Re: odometry (was Re: Homing with the IR Tower)
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(...) Yes, 95 ticks are always 95 ticks, but the point is if your robot really *is* in the position where it's expected to be on the floor. The main problem with odometry, as you know well, is that errors accumulate very fast. The unavoidable (...) (25 years ago, 28-Jul-99, to lugnet.robotics)
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| | Re: odometry (was Re: Homing with the IR Tower)
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At 09:20 28-07-1999 Wednesday , Mario Ferrari wrote: [snip] (...) I've downloaded, printed and read it all some time ago :-) (...) I've used 2 wheels instead of tracks once, and the results where terrible compared with tracks. The problem was that (...) (25 years ago, 28-Jul-99, to lugnet.robotics)
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| | Re: odometry (was Re: Homing with the IR Tower)
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(...) I see your point. Yes, F1 kind wheels are far from ideal to avoid slippage and get accurate results. The larger but thinner spoked wheels that come with the Minstorm RIS are quite better. The free wheel(s) also must be light and thin and (...) (25 years ago, 28-Jul-99, to lugnet.robotics)
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| | Re: odometry (was Re: Homing with the IR Tower)
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(...) Great source. Just found a source where Johann Borenstein discusses the original 1966 paper and gives links for the full electronic version or a CDROM or a book version. Here is the source: (URL) for the pointer! Ralph M. Deal deal@kzoo.edu -- (...) (25 years ago, 28-Jul-99, to lugnet.robotics)
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| | Re: odometry (was Re: Homing with the IR Tower)
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I haven't done any 'bot yet but I have been thinking about this problem. and here's the result: it looks like the good free wheel should do its 'wheeling' equally well in each direction. therefore it should be a ball. the design should look like (...) (25 years ago, 31-Jul-99, to lugnet.robotics)
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| | Re: Non-pivoting free wheels (was Re: odometry (was Re: Homing with the IR Tower)
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(...) <snip> Whoa! =:-o That's what a call a DESIGN! I'm almost burning a fuse trying to image one of those running, err... turning... whatever it does! OK, what are good sources of baloon tires? (sets) :-) Laurentino Martins [ (...) (25 years ago, 3-Aug-99, to lugnet.robotics)
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| | Non-pivoting free wheels (was Re: odometry (was Re: Homing with the IR Tower)
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You'll have a very hard time making a ball-and-socket design bear a load and turn without lots of friction. Putting wheels between the ball and the socket just brings us back to the problem that we were trying to avoid by not having wheels. A much (...) (25 years ago, 3-Aug-99, to lugnet.robotics)
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| | RE: Non-pivoting free wheels (was Re: odometry (was Re: Homing with the IR Tower)
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Good balloon tires are available in two service packs: Service pack 5283 (43.2 mm diameter) Service pack 5282 (68.8 mm diameter) - these suckers are huge, but have just the right shape. Tilman (...) -- Did you check the web site first?: (URL) (25 years ago, 3-Aug-99, to lugnet.robotics)
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| | Re: Non-pivoting free wheels (was Re: odometry (was Re: Homing with the IR Tower)
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Here's a couple of short motion clips of the killough platform in motion. (about 1.4 MB each in mpg format) I had been waiting to get a few really nice movies of this but a relative of mine dropped by last weekend and shot these to show a friend of (...) (25 years ago, 4-Aug-99, to lugnet.robotics)
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| | Re: Non-pivoting free wheels (was Re: odometry (was Re: Homing with the IR Tower)
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I was asked via E-mail where to get the balloon tyres. They are listed in the Shop-at-Home catalog as item 5282: (URL) just ordered some from here in the United States and they were $6.00 per package. Each package includes two tyres and two wheels (...) (25 years ago, 4-Aug-99, to lugnet.robotics)
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