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ITSA General Assembly: December 5th - 12th

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 81 
 on: January 11, 2019, 04:10:54 PM 
Started by ta0 - Last post by Iacopo
Can anyone tell if it's also free to spin about the stem?

I am not sure but maybe the emisphere is free to spin about the stem.  They would spin in opposite directions, when they both spin in contact with the table. Without this freedom to spin, the emispheres would be constrained to slip on the table, because they couldn't spin in different directions.  But, looking at the video, it seems to me that the movement, at the end of the video, seems clean, which makes me think that the emispheres are free to spin as the table wants, in opposite directions.
Also, at the very end of the video, when the top is rolling along the table, I note that it isn't tracing a straight trajectory, like I would expect, the two emispheres having the same diameter.  This, too, makes me think that the upper emisphere is free to spin about the stem.

In the first half of the video it seems that only one emisphere is in contact with the table: here the top seems to behave like a biconical top, or a spinning tube.
   

 82 
 on: January 11, 2019, 03:38:40 PM 
Started by ta0 - Last post by Jeremy McCreary
... Made by the Swiss company Naef, which regularly comes out with nice but expensive tops.

For example, this really nice color-mixing top. Great fun -- and easy to do in LEGO as well!

 83 
 on: January 11, 2019, 03:31:40 PM 
Started by paxl13 - Last post by paxl13
Are you attempting overhand (yo-yo) or underhand whips?  The underhand are easier.
Just open the string by having the loop come on each side of your fist and swing it so one of the sides of the loop hits the top, not at the end but further up (half way or more for the underhand whip).

I was attempting from up downwards... so the string is going down as the top is too...
What you are suggesting is the other way around I presume.

Will try that out this weekend!
Thanks ta0

 84 
 on: January 11, 2019, 03:30:04 PM 
Started by paxl13 - Last post by paxl13
dear Pax (è salute..)

you're doing good ! what a rookie !
how's winter in north-land ?

keep posting on your progress,we enjoy it much

jim

Thanks, If I find the time, I'll post a vid this weekend ( something simple in one take without editing like the other ones :P )

 85 
 on: January 11, 2019, 03:17:35 PM 
Started by ta0 - Last post by Jeremy McCreary
Clever extension of the tippe top! Centrifugal force happens. You might as well play with it.

The upper hemisphere is clearly free to slide along the stem. Can anyone tell if it's also free to spin about the stem?

Videos suggest otherwise -- i.e., that the upper hemisphere is internally keyed to the lower via the stem such that the hemispheres rotate in lock step even when separated. Just can't tell for sure.

 86 
 on: January 11, 2019, 03:00:20 PM 
Started by paxl13 - Last post by ta0
Are you attempting overhand (yo-yo) or underhand whips?  The underhand are easier.
Just open the string by having the loop come on each side of your fist and swing it so one of the sides of the loop hits the top, not at the end but further up (half way or more for the underhand whip).

 87 
 on: January 11, 2019, 02:23:40 PM 
Started by ta0 - Last post by ta0
he mentions japanese , doesn't he ?

Naef credits the design to Keita Seto, which is certainly a Japanese name:

https://www.youtube.com/watch?v=OD61ss1ztrU

Edit: It seems to have been created by Seto Design, a husband and wife team from Kamakura city, close to Tokyo (www.setodesign.jp).
In their list of collaborations they have some other toy developed for Naef. What I don't know is if the basic concept is their creation or it was based on a previous Japanese top.

 88 
 on: January 11, 2019, 01:46:10 PM 
Started by ta0 - Last post by jim in paris
cool effect

he mentions japanese , doesn't he ?

jim

 89 
 on: January 11, 2019, 01:42:57 PM 
Started by paxl13 - Last post by jim in paris
dear Pax (è salute..)

you're doing good ! what a rookie !
how's winter in north-land ?

keep posting on your progress,we enjoy it much

jim

 90 
 on: January 11, 2019, 12:02:41 PM 
Started by ta0 - Last post by ta0
A little surprise top:

https://www.youtube.com/watch?v=2LyJgNllpio

Made by the Swiss company Naef, which regularly comes out with nice but expensive tops.

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