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 Post subject: AndrewG's F-Skewb
PostPosted: Sun Dec 30, 2012 9:10 pm 
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Joined: Tue Jun 26, 2007 2:59 pm
Location: Houston, TX, USA
Howdy All,

I have not been posting on the forum very much in the last couple years, but I still read occasionally, and it is astounding how fast all areas of this community are progressing. Not so many years ago, 3x3x3 WR had been stuck at 12 seconds for years, and now it is less than half that. I remember when I felt a bit proud to get 1st fewest moves on gelatinbrain's 3.3.3 (now called QuadX I think?) and a few other puzzles but now, others have solved puzzles so so much more complex. And I remember how amazed we were the first time someone built a Gigaminx or 6x6x6, but now with easy access to 3D printing, the world of custom puzzles has exploded.

I very much enjoy checking into the forum every couple of months to see the amazing things people have built and solved!

While reading the forum in April 2012, I stumbled across Timur's F-Skewb v2. Instantly, I loved this puzzle. It is simple, unique, and innovative all at once. By the way, thank you, Carl, for your long post in Sept. 2010 about what this puzzle is. The last puzzle I built was a rather low-quality Dino Cube in 2009, but the F-Skewb awakened my desire to build a puzzle again.

So I got to work and 8 months later, here is the result!

I concept-designed with POV-Ray, then made 3D models with OpenSCAD. It is a freeware program which can generate STL files using constructive solid geometry (CSG). The basic shapes are easy to generate but there is a severe drawback: no fillet tool! I enjoyed doing the math to write my own filleting code, though.

My mechanism is slightly different from Timur's. It only has one internal spherical level, but I think it contains more internal pieces. The puzzle contains 39 pieces, 11 of which are completely internal.

I printed the puzzle in unpolished WSF on Shapeways, then manually sanded the pieces and cut the stickers. Turning quality is good but not excellent. The peices are all solid, so it cost more than it could have, but I like the how the extra weight feels. The puzzle edge length is 57mm.

I'm also attaching a text file with some solution notes. It takes me 70-100 moves to solve using the Ultimate Magic Cube program. There's plenty of room for improvement, though.

Attachment:
AndrewG F-Skewb - 2 moves.JPG
AndrewG F-Skewb - 2 moves.JPG [ 142.09 KiB | Viewed 1896 times ]


Attachment:
AndrewG F-Skewb - Small Twist.JPG
AndrewG F-Skewb - Small Twist.JPG [ 144.15 KiB | Viewed 1896 times ]


Attachment:
AndrewG F-Skewb - Large Twist.JPG
AndrewG F-Skewb - Large Twist.JPG [ 144.68 KiB | Viewed 1896 times ]


Attachment:
AndrewG F-Skewb Piece Layout.JPG
AndrewG F-Skewb Piece Layout.JPG [ 185.04 KiB | Viewed 1896 times ]


Also, the tips on this forum have been extremely helpful when I've built puzzles, so in return, here are some details on this puzzle. Hopefully they can help someone.

1) When I built the Dino cube in 2009, I lengthened the spindle arms by 1 mm because I'd heard people talk about puzzles needing internal clearances. The Dino cube was much too lose. This puzzle was printed with zero internal clearances, and it doesn't need any. To loosen the puzzle slightly, I backed out the screws by fractions of a turn.

2) I sanded the pieces using 150 then 320 grit (and then 600 then 1000 grit on the external surfaces only), and I lapped (rubbed against each other) some of the internal grooves which were too small to sand. The external surfaces don't appear smooth but they feel smooth. In retrospect, it might have been worth my time to order the pieces in polished WSF.

3) I read elsewhere here a tip to fillet sticker corners by three small snips with scissors. That was very helpful!

4) For stickers, I used adhesive-backed vinyl that I bought from a local sign shop. It looks & feels great but the adhesive is somewhat weak.

5) A half-turn of a small layer on this puzzle makes it very easy to access the screws, but I didn't realize that until after I assembled it. Haha


Attachments:
File comment: Contains a solution method and sequences.
F-Skewb Solution Notes.txt [1.67 KiB]
Downloaded 86 times
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 Post subject: Re: AndrewG's F-Skewb
PostPosted: Mon Dec 31, 2012 6:09 am 
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Joined: Mon Mar 22, 2010 7:00 am
Location: Germany, Siegerland
It looks very nice, good job!

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 Post subject: Re: AndrewG's F-Skewb
PostPosted: Mon Dec 31, 2012 9:56 am 
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Joined: Mon Aug 02, 2004 7:03 am
Location: Koblenz, Germany
Amazing achievement.
And a good reminder for this unusual puzzle.


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 Post subject: Re: AndrewG's F-Skewb
PostPosted: Mon Dec 31, 2012 1:06 pm 
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Joined: Thu Dec 02, 2004 12:09 pm
Location: Missouri
AndrewG wrote:
By the way, thank you, Carl, for your long post in Sept. 2010 about what this puzzle is. The last puzzle I built was a rather low-quality Dino Cube in 2009, but the F-Skewb awakened my desire to build a puzzle again.
You are VERY welcome... and welcome back by the way. This is a great looking F-Skewb.
AndrewG wrote:
The peices are all solid, so it cost more than it could have, but I like the how the extra weight feels.
Nice!!! If money wasn't a factor I think I'd make my pieces solid too.

AndrewG wrote:
I concept-designed with POV-Ray, then made 3D models with OpenSCAD. It is a freeware program which can generate STL files using constructive solid geometry (CSG). The basic shapes are easy to generate but there is a severe drawback: no fillet tool! I enjoyed doing the math to write my own filleting code, though.

2) I sanded the pieces using 150 then 320 grit (and then 600 then 1000 grit on the external surfaces only), and I lapped (rubbed against each other) some of the internal grooves which were too small to sand. The external surfaces don't appear smooth but they feel smooth. In retrospect, it might have been worth my time to order the pieces in polished WSF.
Actually since you made these solid there was another option you had that could have allowed you to avoid BOTH of these steps. You could have just printed the pieces without fillets and then had Brandon tumble the pieces for you. The tumbling process would have added nice fillets AND sanded the pieces for you.

Carl

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 Post subject: Re: AndrewG's F-Skewb
PostPosted: Sat Jan 05, 2013 4:50 pm 
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Joined: Thu Aug 24, 2006 5:34 pm
Location: Rotterdam, Netherlands
Great work.

Thomas

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 Post subject: Re: AndrewG's F-Skewb
PostPosted: Mon Jan 07, 2013 8:03 pm 
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Joined: Tue Jun 26, 2007 2:59 pm
Location: Houston, TX, USA
wwwmwww wrote:
Actually since you made these solid there was another option you had that could have allowed you to avoid BOTH of these steps. You could have just printed the pieces without fillets and then had Brandon tumble the pieces for you. The tumbling process would have added nice fillets AND sanded the pieces for you.


Who is Brandon? Are you talking about the polish option on Shapeways? I thought about getting that but then decided to be cheap and get unpolished because I didn't yet realize how long sanding would take :roll:

Thanks!


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 Post subject: Re: AndrewG's F-Skewb
PostPosted: Mon Jan 07, 2013 8:20 pm 
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Joined: Sun May 29, 2011 2:56 pm
Location: New York
AndrewG wrote:

Who is Brandon?

Brandon's TP username is bmenrigh.

-Doug

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