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 1 
 on: Today at 05:43:21 PM 
Started by Jeremy McCreary - Last post by Jeremy McCreary
An interesting mechanical problem complicated by the Maxwell wheel's horizontal spin axis.

Do you plan to (a) spin up the Maxwell wheel and top simultaneously, or (b) spin up the wheel first and then transfer its anglar momentum to the top? Either way, the wheel and top need not be coaxial. With (a), I can imagine a geared LEGO solution with the top always vertical.

 2 
 on: Today at 04:32:14 PM 
Started by Jeremy McCreary - Last post by ortwin
@ortwin: Thanks!

Need to see some diagrams of your idea. And what's a Maxwell wheel?
Maxwell's wheelhttps://youtu.be/8Ch9TDeW1FU

The idea is to convert this yo-yo like thing into a spinning top in a moment when it has  picked up speed and is close to its lowest point. For this it has to let go of the strings -that is the easy part. But at the same time its axis needs to change from horizontal to vertical orientation.

 3 
 on: Today at 03:32:50 PM 
Started by ortwin - Last post by ortwin
...
I guess you have to spin it and then rush to cover it and pump out the air as fast as possible. It should be possible to start one inside a vacuum chamber using magnets. My idea would be to have the top hanging from the chamber ceiling because of a rotating spinning magnet above. The top would either have a magnet or a non circular stem so as to rotate with the driving magnet. After it reaches the necessary speed, you take away the external magnet and the top falls on the surface.

I would like to have a vacuum setup. Perhaps one day . . .
Yes I have to do it like you suspect. There surely are different ways to start tops in a vacuum chamber. I would like purely mechanical ones best, but then again why exactly would you want  that?
With Something like "top secret" you can start the top, then close the vacuum chamber while the base sits outside and drives the top until you pumped down as far as you like (or can do it) . After that you can observe how it spins down when you take away the base.


 4 
 on: Today at 03:18:31 PM 
Started by ortwin - Last post by ortwin
JBB looks great! Eager to see it in action. Spartan can be forgiven for getting desperate.
Since I asked for some "ad ons" and some little changes it will be at least another week until it comes back.

 5 
 on: Today at 12:24:07 PM 
Started by Watts' Tops - Last post by ta0
End of a era, indeed!  :o
Your tops were very important for the development of modern top play in the USA.
I believe I have four of your tops, from 4 inches to 8 inches, although only one with the traditional colors. I need to take a family picture.

 6 
 on: Today at 12:20:08 PM 
Started by ortwin - Last post by ta0
Nice!  8)

I guess you have to spin it and then rush to cover it and pump out the air as fast as possible. It should be possible to start one inside a vacuum chamber using magnets. My idea would be to have the top hanging from the chamber ceiling because of a rotating spinning magnet above. The top would either have a magnet or a non circular stem so as to rotate with the driving magnet. After it reaches the necessary speed, you take away the external magnet and the top falls on the surface.

I would like to have a vacuum setup. Perhaps one day . . .

 7 
 on: Today at 12:16:16 PM 
Started by Jeremy McCreary - Last post by Jeremy McCreary
Super ! Jeremy you make  my  day
Wife friendly yes
But it takes place in the  kitchen ???
I hope joe mauk will see it

Too kind! Just sent Joe a PM.

Kitchen?? No, no, no, no, no. Kathy's read a thousand murder mysteries. She's got skills.

 8 
 on: Today at 11:58:55 AM 
Started by jim in paris - Last post by ta0
Wow! I like that photo on several levels, Maurizio!
Super-spin-man is back!  8)

I'm very excited about what the implied message could be for the future of Strummol8.   ;)  :)

Can we get the T-shirt?  ;)
I guess the left side of the equation technically should have P as a subscript to denote the precession spin (ωP = mgr/Iω)

 9 
 on: Today at 11:47:33 AM 
Started by Jeremy McCreary - Last post by jim in paris
Super ! Jeremy you make  my  day

Wife friendly yes
But it takes place in the  kitchen ???

I hope joe mauk will see it

Jim

 10 
 on: Today at 10:46:36 AM 
Started by ortwin - Last post by Jeremy McCreary
JBB looks great! Eager to see it in action. Spartan can be forgiven for getting desperate.

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