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Author Topic: spinning bicycle chain  (Read 230 times)

ortwin

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spinning bicycle chain
« on: June 27, 2021, 06:05:29 AM »

Spinning and a bit dangerous?
This is not Ms. Skimpy in chains that Jeremy is going to make a video of, but it another video from the same German university where we saw that container with oil and water spinning.
https://videoportal.uni-freiburg.de/video/A-617-stabilisation-einer-fahrradkette/0e7e994543c17df03469e9d553ae4f8c
« Last Edit: June 27, 2021, 10:19:16 AM by ortwin »
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ta0

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Re: spinning biciyle chain
« Reply #1 on: June 27, 2021, 10:40:28 AM »

Yep, that looks like a somewhat dangerous demonstration to do in class nowadays. But this is exactly the same demonstration described on the 1890 Spinning Tops book by John Perry, including the running off the table and bouncing on the floor:

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Jeremy McCreary

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Re: spinning bicycle chain
« Reply #2 on: June 27, 2021, 01:24:10 PM »

Hmmm, this principle could be the basis of a fun new kind of bowling, but lane maintenance would be a nightmare.

I feel a LEGO knock-off coming on.
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Jeremy McCreary

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Re: spinning bicycle chain
« Reply #3 on: June 29, 2021, 03:24:34 AM »

Chain bowling, anyone?

https://youtu.be/d085hvCcvE8

When launched at ~7,800 RPM, the short chain loops used for bowling can roll up to 3.5 m before collapsing.

A related chain accelerator running at up to 3,300 RPM enters at 3:43. See video description for details.
« Last Edit: June 29, 2021, 03:41:27 AM by Jeremy McCreary »
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ortwin

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Re: spinning bicycle chain
« Reply #4 on: June 29, 2021, 03:37:39 AM »

Excellent Jeremy!
And you tell your wife the dog scratched the floor?
In science centers the big version of that standing chain is one of my favorites to play with.
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the Earl of Whirl

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Re: spinning bicycle chain
« Reply #5 on: June 29, 2021, 10:19:24 AM »

That is hilarious!!!

Good job in putting that all together.
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ta0

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Re: spinning bicycle chain
« Reply #6 on: June 29, 2021, 11:13:55 AM »

Perfect LEGO implementation! And you made it fast!
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ortwin

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Re: spinning bicycle chain
« Reply #7 on: June 29, 2021, 04:01:39 PM »

....And you made it fast!
You really believe that ta0? 
I don't! 
I think Jeremy knows all those things already, built the LEGO  counterparts long time ago and now he is just pulling them out of cupboards as soon as we mention them.
Come on, time after time its like ten minutes later and Jeremy comes around the corner : " Oh, and by the way, I came up with a LEGO knock off of this."
Okay, once in a while like with the "blackbird vehicle" he admits that he had it build long time ago, but that I believe is just to cover up the many other instances!

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Jeremy McCreary

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Re: spinning bicycle chain
« Reply #8 on: June 29, 2021, 04:27:17 PM »

Yeah, I pull things off the shelf a lot -- mainly because a lot of top ideas are, well, just inevitable. But I had the chain bowling up and running from scratch 2 days before I shot the video.

Modular construction + many parts on hand + many years building + decent feel for mechanics + very rapid guess-and-check cycles -> quick knock-offs. Fun to be able to fool around with good ideas when you see them!
« Last Edit: June 29, 2021, 04:29:56 PM by Jeremy McCreary »
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the Earl of Whirl

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Re: spinning bicycle chain
« Reply #9 on: June 29, 2021, 05:44:39 PM »

You are a creativity champ!!!
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