Online since 2002. Over 3300 puzzles, 2600 worldwide members, and 270,000 messages.

TwistyPuzzles.com Forum
 It is currently Fri Jul 25, 2014 4:00 pm

 All times are UTC - 5 hours

 Page 1 of 1 [ 6 posts ]
 Print view Previous topic | Next topic
Author Message
 Post subject: 7x7x7 mechanism ideaPosted: Thu May 09, 2002 1:08 pm
I have figured out a way to make an undistorted 7x7x7 cube mechanism. It uses a 3x3x3 cube expanded to a grooved sphere as the core, but that isn't the important part.

The important part, of course, is how to get the 8 corners to work. Each corner piece is attached the corresponding corner of the core via a metal shaft. These shafts have a small kink sqrt(3) away from the outer corner and can rotate in crankshaft fashion to get out of the way of an inner edge of the 2nd row as a 1st row is rotated. These crankshafts neatly solve the problem of maintaining the position of the corner pieces relative to the rest of the mechanism while getting out of the way of the inner edges which make a traditional 7x7x7 mechanism impossible.

The rest of the mechanism does not need such crankshafts. Pairs of pieces fit in each groove segment and quartets of pieces fit at each groove intersection to fill out the rest of the mechanism. I've worked out the geometry of the remaining pieces and they don't conflict.

Top

 Post subject: ?Posted: Thu May 09, 2002 6:38 pm

Joined: Sat Nov 24, 2001 8:31 am
Location: New York
But holding the corners in really isnt a problem, its just like using a 5x5. The center is an extended 3x3x3.
The problem is that when you turn a layer, lets say the U layer 45 degrees (does anyone know how to make that degrees symbol?) The "wings" in the "u" layer will have nothing holding them in place.

Top

 Post subject: Very impressivePosted: Fri May 10, 2002 1:08 pm

Joined: Sun May 27, 2001 7:03 pm
Your plans sound very clever... Im not one of the people here who make these puzzles, but i certainly AM hanging out to see a 6x6x6 or 7x7x7 one day! Good luck, and if you ever get to making one, dont forget to tell us all...

Top

 Post subject: U layer WingsPosted: Fri May 10, 2002 6:38 pm
I'm not exactly sure what the terms "U layer" and "wings" refer to, but I do know what the problem with designing the 7x7x7 is.

Holding the corners and edges in are the problem, because of what happens when you rotate a side by 45 degrees. The edges are handled pretty easily, by extending them inward perpendicular to the only axis in which they problematically rotate. The corners are not handled easily, because they problematically rotate on 3 different axes.

If you just use a 5x5x5 style mechanism to hold in the corners, you can't rotate the layers with the corners. If you try to rotate it 45 degrees, the support for the corner will run into the edge of the middle cubes of the next layer. This is why a crankshaft is needed. The crankshaft lets the support move out of the way while still providing solid support.

Top

 Post subject: Degrees symbol like this °Posted: Wed May 15, 2002 5:02 am

Joined: Tue Mar 14, 2000 9:11 pm
Location: Dubuque, IA area
Hi Tyler,
To make the degrees symbol here is what you have to do:

First make sure that your numbers lock on your keyboard is turned on. Then while holding down the "Alt" key, type in the number "248" on the keyboard's number pad. When you release the "Alt" key, the degrees will show up.

There are other symbols that can be made using the same method but using a different 3 digit number. Depending on what you are doing, it may or may not work. Here are a few other useful ones:
± 241
≈247
²253
π 227
µ230
Ω234
√251
÷246
≥242
≤243

Top

 Post subject: ASCIIPosted: Thu May 16, 2002 5:02 am

Joined: Sat Nov 24, 2001 8:31 am
Location: New York
I know about ascii, i do VB and C++ (borland) programming... I just didnt know the keycode so i didnt bother. My favorite one is ¿¿ heheh. good for spanish projects

Top

 Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending
 Page 1 of 1 [ 6 posts ]

 All times are UTC - 5 hours

#### Who is online

Users browsing this forum: No registered users and 9 guests

 You cannot post new topics in this forumYou cannot reply to topics in this forumYou cannot edit your posts in this forumYou cannot delete your posts in this forumYou cannot post attachments in this forum

Search for:
 Jump to:  Select a forum ------------------ Announcements General Puzzle Topics New Puzzles Puzzle Building and Modding Puzzle Collecting Solving Puzzles Marketplace Non-Twisty Puzzles Site Comments, Suggestions & Questions Content Moderators Off Topic