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 71 
 on: February 11, 2018, 04:27:02 PM 
Started by Iacopo - Last post by ta0
I love the way you think, Iacopo!  8)

When the magnet is exactly centered and the top spins without wobble, the Lorentz force on the electrons of the metal will be radial. So there will be no close circuits for the eddy currents to form. The only effect will be a transient movement of electrons until a radial potential (voltage) is generated that compensates the Lorentz force. Spinning the top in the opposite direction would reverse the voltage. This static equilibrium will generate no losses.
When the magnet and the top are no aligned, eddy currents can travel in close circuits and lose energy to heat.

I think the effect of the earth magnetic field will be even smaller than you calculated. The top will see a uniform earth magnetic field, in contrast to the case for your magnet.
The field of the earth could be decomposed into a vertical component and a horizontal component. The vertical part will only create a radial voltage on the flywheel. Only the horizontal component will create loses: the electrons will go up and down, one cycle per turn of the top. Horizontal lamination of the flywheel would reduce this, but the contribution to losses can probably be neglected.

 72 
 on: February 11, 2018, 12:38:49 PM 
Started by Aerobie - Last post by Aerobie
The physics of rising are described in a book I've owned for many decades, Classical Mechanics: A Modern Perspective, by Barger and Olsson.  Here is their diagram.

The diagram shows friction, offset from the axis of rotation, being converted to rising torque by gyroscopic precession.  Big balls rub the mirror farther from the axis of rotation for a given tilt angle.

In your case, I expect your teflon ball is flattened where it touches the mirror because it is soft.  Although it's a low friction material, it's only moderately lower than your ruby (sapphire) which is hard and not flattened.  So the flattened teflon rubs the mirror farther from the axis of rotation. 

I'm sure that you've noticed that a point has no righting effect.

However, to the degree that a tilted top orbits, friction is reduced.  Friction requires slip.

Best,

Alan

 73 
 on: February 11, 2018, 11:25:46 AM 
Started by paxl13 - Last post by paxl13
I just sent him an email! We'll see what he says!

 74 
 on: February 11, 2018, 10:53:59 AM 
Started by ScottR - Last post by ScottR
Just a random thought I have had a couple times. Wouldn’t it be pretty RAD to have a wood Giulia or STB sitting on the shelf or spinning on a string. Just thought.

 75 
 on: February 11, 2018, 10:42:33 AM 
Started by ScottR - Last post by ScottR
Quote from: Sabaspin

[/quote
Are you cutting the tips on the lathe with regular hss tools? How do the tools hold up?
yes I am the tools hold up ok. I bet I could make at least 2 tips with out sharpening. I guess I’ve never tried to sit down and crank out a bunch of tips. You know I usually make one top and then one tip. All my tips though are roughly the same. With a 3/8” shaft by 1/2” long that’s just press fit
Great looking top!
Perhaps the tip a bit undersized, but very nice top.

Excellent routine! And there are some uncommon moves there!  :o  8)
What do you call the vertical bouncing in the triangle? It may qualify as a new trick.
Also, the lasso with both hands coming from the side has a distinct look. And the finish also looks original.
Well done!
Hey ta0 thanks man. The tips are pushing it as far as size. Any larger and I would make them a bit bigger for sure. As for some of the tricks the vertical bounce thing is the barrel bounce totw. The 2hand sideways whip thing is some thing I just started doing one day and the last trick is also a totw around the leg and back or something like that
Wow your work is amazing, I really like your wooden tops, if they play half as their beauty, they are great.

Maurizio
So the wood tops play pretty well with some balancing. There is nothing like spending a couple hours on making a top that spins smooth as glass right off the lathe. And I don’t get that from working with wood. At least not yet. So it’s a bit frustrating. But still super fun

 76 
 on: February 11, 2018, 10:35:29 AM 
Started by Softspin - Last post by MrYo
In fact they have a good amount of STB and few pieces of Giulia and Sofia, all produced in Italy. They don't have my permission to produce the tops, only to sell the ones they have. To avoid more troubles with bootleg, all my tops will have new design, I hope to be able to produce both Giulia and Sofia soon.

Maurizio

 77 
 on: February 11, 2018, 09:44:51 AM 
Started by Turegano - Last post by Turegano
Make your tops and dress them.

I've talked enough, you don't get the point and you will never understand it.
This year will see the new versions of Giulia Sofia and Love, maybe something new at all, with a bit of luck an injection top (this time patented but I'm sure you will have your "similar but not equal" ready few months after).
Now I'm tired of this ointless bla bla bla, i have work to do.

Bye
Here I show you that the tops are of many shapes and will always be different spinning tops different designs in the same world pattern spinning top, trickle deidrel toupie all are the same only change the body the curve the design but they are all the same spins

 78 
 on: February 11, 2018, 09:23:49 AM 
Started by Turegano - Last post by Turegano
observes maurizzio understands is not equal the process is different put it in the head

 79 
 on: February 11, 2018, 09:14:58 AM 
Started by Turegano - Last post by Turegano
good I already put on my part and if you do not want to make peace that remains in you just tell you that I will change a bit the interior design of the top to make my design different on the inside because it is different and unique and congratulations for your contribution to the world of spinning but I repeat the spinning tops are spinning thousands of years have only made modifications of the same pattern yours was very good listening well was 2010 and now the world continues to innovate and moving forward and if you want just be yours the design buys the patent only so you can stop me while I continue advancing greetings and when I want I am to serve you my Italian colleague

 80 
 on: February 11, 2018, 09:09:35 AM 
Started by Turegano - Last post by MrYo
Make your tops and dress them.

I've talked enough, you don't get the point and you will never understand it.
This year will see the new versions of Giulia Sofia and Love, maybe something new at all, with a bit of luck an injection top (this time patented but I'm sure you will have your "similar but not equal" ready few months after).
Now I'm tired of this pointless bla bla bla, i have work to do.

Bye

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