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Stacking tops
Two stemless clutch tops designed to stack while spinning.
About this creation
Please feel free to look over the images and skip the verbiage.

Designed these stemless LEGOŽ tops to stack while spinning. Stacks of 2 work quite well, but stacks of 3 or more seem unlikely to succeed.



The idea came from a favorite spintoy -- the Super Stacking Tops by Toysmith (4:36 above).



The Toysmith set comes with a cleverly designed wind-up starter and 5 tops -- all hollow inverted cones with the same 120° apex angle and top-top bearing design.



The tops measure 43, 53, 63, 73, and 83 mm in maximum diameter and weigh 11, 16, 21, 26, and 32 g. My tops are 93 mm and 38-44 g in comparison.



The Toysmith instructions show the broad apex angle well. Stacks of 4 are pretty easy. Stacks of 5 are much harder -- at least with my set. The slight wobbles in 2 of my tops don't help.

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LEGOŽ stacking top system

The LEGOŽ tops are minor adaptations of the clutch tops posted here in early 2016.



Clutch tops have detaching stems coupled to their rotors via dog or friction clutches. To start one, you engage the stem and spin it up with your fingers or a suitable starter. To launch it, you simply pull the stem away -- typically as the top's speed starts to level off.

The bearing between the upper top (left) and the lower was the hardest part. My only successful bearing uses this gold bamboo hat (93059) as the upper top's tip.



The stiffer tip assembly on the lower top (right) improves the odds of a successful stack by suppressing lower top wobble.



Here, I used all-LEGO wind-up starters with dog clutches to get the short spin-up times and high launch speeds needed to make stacking work. The dog clutches here have 3 light gray prongs.



Since my rewinding times are much longer than Toysmith's, I had to provide a pre-wound starter for each top. The 2-motor starter in the foreground is for the upper top.



The Toysmith starter is fully wound at 3-4 half-turns. These take 14-18.

The LEGO pull-back motor (12787c01) powering the lower top starter is TLG's latest and most powerful. Since stacking is easier when the upper top spins up more quickly, its starter adds a 2nd motor in series. The Toysmith and 1-motor starters are roughly equal in stalled torque. The 2-motor starter for the upper top produces about twice that.

See first video description for additional details.

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Specifications
Format where tops differ: upper, lower

Overall dimensions(DxH):93x40, 93x46 mm
Mass:38, 44 g
Starter type:Wind-up with 2, 1 pull-back motors
Clutch type:Dog
Free-standing spin time with 1-motor starter:~65 s
Stacked spin time:35-40 s
Modified LEGOŽ parts:Lower tip cut from 4L antenna
Non-LEGOŽ parts:None
Credits:Original MOC inspired by a commercial spintoy (Toysmith Super Stacking Tops)
See also:Stemless clutch tops, "crater tops" based on 6x6 and 10x10 round corner slopes, LEGOŽ top folder

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Comments

 I like it 
  September 4, 2018
Yeah I really understand you my good friend. It's the same on my side. So many friends left Mocpages and moved to other pages. But actually another old page is having it's revival. Emergency Bricks a Lego fire community site. It got a new design and many nice functions and now some of the old friends are coming back :) Thank you so much for your big compliment. Means a lot to me too. It's so great having such nice friends like you. But now it's time to go to bed. Wish you the best for the rest of this Tuesday. Take care and never stop building ;)
 I made it 
  September 4, 2018
Much too kind, Sven! The "company" I had in mind: Some fellow top-builders to help me advance the art and engineering -- both of which are more complicated and full of untapped potential than they might look. Sadly, few if any top MOCpages other than mine since Yuri Fassio's last top contest in 2012 or so. ||| Of course, I miss all the good MOCpages friends and admired builders lost to Flickr and other outlets in recent years. But I'm honored to have a few left here -- including you. Your continued friendship and kind words mean a lot to me.
 I made it 
  September 4, 2018
Quoting Dark Destroyer So cool! They look like lots of fun!
Many thanks, DD! Play value is almost always Goal No. 1 in my MOCs -- especially in the tops. Despite all the guess-and-check and failures along the way, it's also fun for me to get things like this to work. Now to stack more than 2 tops and keep them from falling over too soon. Stay tuned.
 I like it 
  September 4, 2018
What do you mean with company here on Mocpages? Lacking activity? With your invitation is really really really cool! Congrats my good friend, that's an achievement. You really deserve it because you're such a great and friendly guy with lots of talent ;) Thank you also for your kind wishes. Much appreciated. I'm right now back home from work and try to get some food done XD Have a great day Jeremy and say hello to your's from me and Julia.
 I like it 
  September 4, 2018
So cool! They look like lots of fun!
 I made it 
  September 3, 2018
Quoting Daniel H. This is so cool! They look like a lot of fun! Excellent work as always!
Very kind!
 I like it 
  September 3, 2018
This is so cool! They look like a lot of fun! Excellent work as always!
 I made it 
  September 3, 2018
Quoting Sven ;o) Again some really cool work from you my friend! Great to see you still working on new tops. As Nils mentioned, the double pullback engine accelerator is very cool! Great work! All the best to you and your family in Colorado from us in Germany. Take care.
Very kind, Sven! Same to you and yours. Very excited about an invitation I just received to show my tops at an international spinning top festival near Paris, France in early 2019. The festival has nothing to do with LEGO otherwise, and it attracts some very serious top fanciers, collectors, and performers. They're even paying some of my expenses! Truly a great day for the art of LEGO top-making. Just wish I had some company here on MOCpages.
 I made it 
  September 3, 2018
Quoting Clayton Marchetti Stackable tops! That’s awesome!
Many thanks, Clayton! Porting commercial toy ideas to the LEGO realm is lots of fun. You just have to shrug off the inevitable failures along the way. And no shortage of failures here.
 I made it 
  September 3, 2018
Quoting Nils O. So cool, more new ideas for Lego tops! The stacking tops are cool, but my fovourite is the double pullback engine accelerator. Great job! :-))
Thanks, Nils! The 2-pullback starter cranks out an impressive amount of torque -- and it's very much needed for my tops with the highest rotational inertias. Usually doesn't change launch speed much, and may even reduce launch speed slightly in low-inertia tops due to the added internal friction. But it gets all tops up to speed a lot faster than the starter with just 1 pullback.
 I like it 
  September 3, 2018
Again some really cool work from you my friend! Great to see you still working on new tops. As Nils mentioned, the double pullback engine accelerator is very cool! Great work! All the best to you and your family in Colorado from us in Germany. Take care.
 I like it 
  September 3, 2018
Stackable tops! That’s awesome!
 I like it 
  September 3, 2018
So cool, more new ideas for Lego tops! The stacking tops are cool, but my fovourite is the double pullback engine accelerator. Great job! :-))
 
By Jeremy McCreary
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