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Just for Fun


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  #1  
Old 12-30-2015, 08:51:49 AM
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Default Just for Fun

Recently I heard about a new craze, pocket spinning tops. These are very small tops people carry with them for amusement. They are also fairly expensive. They start out at about $20.00 and for a hand made one hit $100.00 quick. I looked at the pictures of several and as I have a lathe and had material laying around I made one just to see if I could. It's 660 bronze and aluminum with a ceramic ball bearing. I can't see making them to sell but I also couldn't see paying for one.



It's pretty easy to get spins of over 5 minuets at a time.
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Old 12-30-2015, 09:40:22 AM
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Default Re: Just for fun.

Well looky there! Guess I'll be making some chips soon.
A ball in the bottom for a contact surface huh? What's the major diameter hence mass you used.

Knowing me, with my if something is enough, too much will be just right mentality I'd likely make something that needs a recoil off a briggs to get it going. Oh the design possibilities! yet building it to work well without precession will be the fun part.

http://foreverspin.com/
http://www.darksucks.com/store_lambda.html


Thanks Reed and anyone reading this thread, post em up!
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Old 12-30-2015, 09:54:26 AM
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Default Re: Just for fun.

A few super magnets and you might be able to get it to levitate.
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Old 12-30-2015, 01:08:25 PM
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Default Re: Just for fun.

The OD is 1.250, height is 1.500, stem is .250 and the knurled part is .312. Bore of the brass is .750 and .375 thick. The ceramic bearing is .250 and from a chemical pump check valve.
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Old 12-30-2015, 02:29:17 PM
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Default Re: Just for fun.

He wears bib overalls.
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Old 12-30-2015, 02:48:57 PM
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Default Re: Just for fun.

Quote:
Originally Posted by Reed Engine View Post
Recently I heard about a new craze, pocket spinning tops. These are very small tops people carry with them for amusement.
Didn't know it was a "New Craze"

I had small plastic ones as a kid in the 1960s and then later on in life I bought a few older wooden ones probably from the twenty's or thirty's, and I too made a couple metal ones 12-15 years ago. Think I may have gotten a couple plastic ones out of cracker-jack boxes and gum-ball machines in the 1970s too. There were even a few wooden ones in a small job-lot box I bought at an auction a few years ago.

They often appear in the wood working magazines as quick and easy projects to make using up all the bits of leftover scraps.

New Craze Indeed.

Just a New Generation relearning an Old Craze that their parents, grandparents, and great grandparents enjoyed for decades before game-boys and other electronics came around.

$20.00 to $100.00 Each YIKES ! Can't tell me the Economy isn't picking up if people are throwing away that kind of money on a $0.05 toy. (maybe $0.25 adjusted for inflation)

Still a fun lathe project though that you whip up quick and easy or get real fancy like Reed did.

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Old 12-30-2015, 03:55:38 PM
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Default Re: Just for fun.

$100.00, that's the craze part.
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Old 12-30-2015, 05:08:56 PM
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Default Re: Just for fun.

Knowing the way I build things it won't fit in a pocket. I was just turning a part for my milling machine on the lathe and eying a slug of brass an inch thick and 3 inches in diameter. Hmmm.

The other thing to make is the platform. Have some nice 1/4" thick glass but how will I make a containment ring .
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Old 12-30-2015, 06:39:45 PM
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Default Re: Just for fun.

A concave mirror from wally world works perfect.
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Old 12-30-2015, 07:44:37 PM
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Photo Re: Just for fun.

Sizes and shapes can vary.

All you need is a disc a point and a shaft to spin it with.

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Old 01-10-2016, 04:20:29 PM
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Default Re: Just for fun.

Otto, these metal tops are a little different than the wooden ones we had as a kid. They have a lot more momentum than the wooden ones. That is why they should run longer. I never timed a top but I didn't think the wooden one would run 30 seconds. Five minutes for a metal one is a long time.

Reed, do you start the top with your thumb and finger and how long can you get your top to run? The part you made 3/8", if you made it 1/4" would you get more speed out of the top? Your top is nice, I think I will try to make one and see if I can get 5 minutes out of it.

Our museum sold a small wooden top that when you got it started, it would flip over and keep running. We sold them for $.50 and I bought one for my nephew's boy and I never did figure out how it worked. I think I am going to see if he still has it. Has anyone seen one like it?
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Old 01-10-2016, 04:36:01 PM
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Default Re: Just for fun.

heins, as I said, sizes and shapes can vary.....

and of course so can the materials.

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Old 01-10-2016, 04:49:27 PM
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Default Re: Just for fun.

I bought a concave mirror at Walmart, I got just under 8 miniutes on a spin recently. edit, got just over 8 min last night.

---------- Post added at 02:46 PM ---------- Previous post was at 02:42 PM ----------

Quote:
Originally Posted by heins View Post
Otto, these metal tops are a little different than the wooden ones we had as a kid. They have a lot more momentum than the wooden ones. That is why they should run longer. I never timed a top but I didn't think the wooden one would run 30 seconds. Five minutes for a metal one is a long time.

Reed, do you start the top with your thumb and finger and how long can you get your top to run? The part you made 3/8", if you made it 1/4" would you get more speed out of the top? Your top is nice, I think I will try to make one and see if I can get 5 minutes out of it.

Our museum sold a small wooden top that when you got it started, it would flip over and keep running. We sold them for $.50 and I bought one for my nephew's boy and I never did figure out how it worked. I think I am going to see if he still has it. Has anyone seen one like it?
The spindle is 1/4" with a 5/16" knurled top. I've since made a couple others, they don't spin as long as my first but they will go 6 min plus. My first has a very low center of gravity, I've come to understand that's important.

---------- Post added at 02:49 PM ---------- Previous post was at 02:46 PM ----------

Check out some of the groups on Facebook. There are people there willing to pay $300.00-$500.00 for an exotic top. Some guys with CNC machines setting idle are making tops with intricate designs and are getting paid accordingly. All I can say is more power to them.

And yes, thumb and finger. Like snapping your fingers but with the index instead of the middle finger.
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Last edited by Reed Engine; 01-11-2016 at 09:18:15 AM.
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Old 01-10-2016, 09:46:38 PM
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Default Re: Just for fun.

Our local SME chapter made a bunch out of aluminum for kids at last year's TechFest in Dayton, Ohio. I still have the print somewhere at work. We used 1.5" stock and I think the cycle time was about 2 minutes on a Haas CNC lathe. They spin okay, but the cg needs to be a little lower. I will try to post a print tomorrow for anyone that wants to make one.
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Old 01-11-2016, 02:42:35 AM
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Default Re: Just for fun.

Quote:
Originally Posted by Reed Engine View Post

.... There are people there willing to pay $300.00-$500.00 for an exotic top...
All I can say there is WOW !

Hope they keep buying tops and don't start buying old engines & tractors and cars & trucks running the prices up if they have that kind of money to spend on toys.

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Old 01-11-2016, 12:59:47 PM
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Default Re: Just for fun.

Here is the print we used. It's one of the first projects that students at the local community college learn how to program.
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Old 01-14-2016, 07:10:47 AM
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Default Re: Just for fun.

I made one 40 mm dia yesterday. I used a steel ball. It spins easily for 5 minutes and my record id 10.35. I made a 50 dia model today and it seems it doesn't do as well. I've tried spinning on glass but best results are on a polished granite bench top.
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Old 01-14-2016, 12:42:38 PM
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Default Re: Just for fun.

Pics?

My best spin so far is 9:27.
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Old 01-14-2016, 08:03:34 PM
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Default Re: Just for fun.

They are nothing fancy. The bigger 50mm ones are a lot harder to get up to a good speed but they do a consistent 5 minutes. The smaller one spins up nice and and consistently does 6+ and my best have been 9.5 and 10.5
I'm going to peel a bit off one of the bigger ones this morning and try that.
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Old 01-14-2016, 08:26:42 PM
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Default Re: Just for fun.

Which would spin easier / longer ... a Point .. or a Ball ?
I guess it would be which one has less friction . on the material it's spinning on.

I've got visions of a point on top .. a point on the bottom ... some sort of "Holder" ... like a flat strap bent in a "U" that you squeeze the "Top" in between two pockets ... then Rope Start the bugger & unclamp it from the "Holder" by releasing hand/squeeze pressure ... unto your hard surface.
Half hour spin times ? Flywheel explosion ?
Holy Crap !
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