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ITSA General Assembly: December 5th - 12th

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 on: Today at 02:52:12 AM 
Started by paxl13 - Last post by Jeremy McCreary
Now, Jose's top is nearly impossible to regen at very low speed
I'm not sure what's the explanation. Perhaps for regeneration you need to achieve the rolling (no slippage condition, so we are not really talking about friction), and the string is too fast.  :-\

In the no-slip rolling regime, you'd definitely have some static friction between, say, cotton string and the metal fixed tip. Maybe also some rolling resistance due to sinkage of the effectively rigid tip into the string segment currently in contact.

 on: Today at 02:39:20 AM 
Started by ta0 - Last post by Jeremy McCreary
Who knew you could do such things with bubbles? Wondering exactly how the large stationary bubble above accommodates the carousel's relative rotation?

I can imagine a bubble-making top with cup-shaped rotor opening upward to hold the soap solution. Rotation would force the solution upward along the cup's inner wall and then outward through properly sized radial holes. The bubbles would then be entrained in the swirling air flow around the rotor.

Such a top might be possible with LEGO, but the rotor would have to be square in plan view.

 on: Today at 02:22:38 AM 
Started by the Earl of Whirl - Last post by Jeremy McCreary
How about anyone else?  Do you have a shirt with a phrase or logo on it that stirs conversation.....spin top related or NSTR?

Once saw a bumper sticker with "I still miss my ex, but my aim's getting better." Someday I'll find the T-shirt.  >:D

Your "Happiness runs in a circular motion!" sig is hard to beat. What about a T-shirt with it circling the chest? To show the full slogan and demonstrate the concept, you'd just spin gleefully with your arms raised!

 on: Today at 12:56:43 AM 
Started by the Earl of Whirl - Last post by Shootist
There is a place called August BBQ in Sylacauga Alabama.  They have Great Food and Ribs.  Their employees wear a T-Shirt with the following saying

Men's Shirt: "Real Men Rub Their Meat".  Women's Shirt: "Real Women Love to Eat Meat".   Remember this is a BBQ Restaurant.

 on: Today at 12:48:58 AM 
Started by ta0 - Last post by cecil
I have been making tops for eight years and still learning - and having FUN. You have a metal lathe? Make some tips.

 on: Today at 12:32:47 AM 
Started by ta0 - Last post by ta0
Some spinning bubbles starting at 3:50. Pretty cool bubble art.

 on: January 21, 2019, 11:45:08 PM 
Started by ta0 - Last post by jmadrigal
Nice print.

 on: January 21, 2019, 11:25:02 PM 
Started by ta0 - Last post by ta0
Well, I finally got the printer kit 2 weeks ago (after crossing the Atlantic 3 times due to a misunderstanding  ::) ) and assembled it last weekend.

I printed a few trial pieces this week in PLA and the results were impressive. Some interlocked gears printed at 150 micron layers spin smoothly and a little frog I printed at the maximum layer resolution of 50 microns (but standard nozzle) has a finish almost looks machined not 3D printed.  :o

Today I decided to try PETG, which is the same material that Prusa uses to 3D print some of the components of the printer itself. I was looking for a model worthy of being printed as a test but in the end could not resist printing Jose's top in thingiverse  :D Because I'm still experimenting and just learning this stuff, I decided to try to print it without support to see what happened. I figured out that problems would occur at the shoulder and I could cancel it without much having been printed. In fact I saw one string of plastic fall and I almost aborted the print. But decided to continue. Two, three, four times it happened, but I had the impression that the print was going to survive, and in fact did. This photo is just after removing it from the printer:

and this one after cutting off the hairs and hammering in a YYF tip:

While it was printing I was thinking the top had too much plastic and it was going to be too heavy, but that is not the case. It plays great! It's also very well balanced, in spite of the hairs I cut.
Great job by Jose and also Josef Prusa!

 on: January 21, 2019, 10:25:34 PM 
Started by the Earl of Whirl - Last post by mailman
Unlike butterfingers, most (if not all) of my shirts are from places I HAVE been, or things I HAVE done.  I still get reactions and comments from some of them, mostly juggling festival t-shirts.

The one item that gets the most attention is a baseball cap I bought on a visit to Texas.  It simply says "Texas" in big letters on the front.  People often ask me about it, and assume I'm FROM Texas because of it.

I also have a shirt that says "Maui" on the front.  People frequently ask if I've actually been there (I have)....

 on: January 21, 2019, 06:53:18 PM 
Started by the Earl of Whirl - Last post by butterfingers
I have an entire collection of T Shirts from places I've never been and things I haven't done. They are all thrift store finds and some have led to  interesting conversations. I started buying them (and still do) if I like the designs. It's really surprising how many people actually read the shirts I wear and I'm frequently stopped and asked about what I'm wearing. Sometimes it's awkward....but that's kind of my thing. It's a running joke in my house that I never go anywhere but I have T shirts from everywhere. You've reminded me that it's time to refresh my collection! The best conversation bait is a shirt from a neighboring city - Buffalo shirts worn in Rochester are an especially good way to attract a conversation. I don't do political shirts - only landmarks or local events - and they have to be for events of places I look like I might actually have visited/attended. Restaurants, BBQ, bars are an easy sell for me. Fun runs, marathons, etc - not so much. 

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