4x4x4 cube: Corners are flipped

[DarthMarth]

I'm a beginner to cubing in general (let alone speedcubing) and working on a 4x4x4 Rubik's Revenge. I'm following a solution where you reduce it to effectively be a 3x3x3 cube by grouping faces and edges together; unfortunately the algorithms I try either aren't working or I'm messing something up. I'm back to having the faces and edges grouped, so it should effectively be a 3x3x3, but I'm noticing something odd: all the corners seem to be flipped. If I try to get them in the right place with the right orientation, two colors need to be swapped. No amount of rotating the corners can fix this; I have no idea how it happened. Unless someone sabotaged my cube, I haven't disassembled it or done anything crazy like that that would have flipped the corners like this. Does anyone know how this could have happened to my cube and how I can fix it?

 

[Sa967St]

There's nothing wrong with your cube, you have PLL parity.

edit: nevermind, I misread it. You probably have to switch 2 opposite centres.

 

[Lord Voldemort]

I think 2 of your centers are switched.
To fix it, try Uw2 D2 M2 (Both layers) D2 Uw2 M2.

 

[soccerking813]

I think 2 of your centers are switched.
To fix it, try Uw2 D2 M2 (Both layers) D2 Uw2 M2

That should work, if I understand what you mean.

 

[Zaxef]

I don't think he has the centers wrong, or else the f2l slots wouldn't match up..
He probably has two top edges that need to be switched
Put the edges that need to be switched in the front and back and do this alg..
r2 R2 U2 r2 R2 u2 r2 R2 u2 U2

Also.. This page might help you:
http://bigcubes.com/4x4x4/finalsolve.html

 

[Sa967St]

I don't think he has the centers wrong, or else the f2l slots wouldn't match up..

he says all the corners are "flipped"

 

[soccerking813]

I'm a beginner to cubing in general (let alone speedcubing) and working on a 4x4x4 Rubik's Revenge. I'm following a solution where you reduce it to effectively be a 3x3x3 cube by grouping faces and edges together; unfortunately the algorithms I try either aren't working or I'm messing something up. I'm back to having the faces and edges grouped, so it should effectively be a 3x3x3, but I'm noticing something odd: all the corners seem to be flipped. If I try to get them in the right place with the right orientation, two colors need to be swapped. No amount of rotating the corners can fix this; I have no idea how it happened. Unless someone sabotaged my cube, I haven't disassembled it or done anything crazy like that that would have flipped the corners like this. Does anyone know how this could have happened to my cube and how I can fix it?

That is definitely wrong center placement.

 

[masterofthebass]

to swap opposite centers, I do r2 U2 D2 r2. It super fast and preserves cross edges if you put that face on F.

 

[esquimalt1]

A video would be easier to understand.

 

[Lord Voldemort]

A video of what?

 

[DarthMarth]

I actually had enough geometric sense to realize that switching two centers might fix it. Does it matter which two? (I doubt it) How should I do it? I tried some moves I thought would switch the centers (related to how I grouped the centers in the first place), but they leave the cube apparently unchanged.

 

[Lord Voldemort]

Nope, any two centers will work just fine.
In my earlier post, I provided one, and so did Dan Cohen in page 1.
Do you not know the notation?

 

[DarthMarth]

Not quite. I don't get what Uw refers to. Isn't that notation for 3x3x3?

 

[Zaxef]

Uw is U-wide.. Meaning the U layer and the one under it

 

[DarthMarth]

Nevermind; I did what I thought your move sequence means and it turned out to work somehow. Thanks.

 

[rjohnson_8ball]

Uw means is a wide (double layer) turn on the U face. For a 4x4x4 that would be the top half.

It is a good practice to get the centers solved and placed in their correct spots before pairing the edges. The colors on your corner cubies determine where the center colors should be. Then once you pair the edges and complete the first 2 layers you can see if you need to flip one double edge. I use Rw2 B2 U2 Lw U2 Rw' U2 Rw U2 F2 Rw F2 Lw' B2 Rw2. Lastly, when you permute the last layer you may need to swap two double edges. I use l2 U2 l2 Uw2 l2 u2. Here, the lowercase l or u indicates the slice next to the L or U face.

 

[Sa967St]

Then once you pair the edges and complete the first 2 layers you can see if you need to flip one double edge.
I use Rw2 B2 U2 Lw U2 Rw' U2 Rw U2 F2 Rw F2 Lw' B2 Rw2.

Rw U2 Rw U2 Rw' U2 Rw U2 Lw' U2 Rw U2 Rw' U2 x' Rw' U2 Rw' :rolleyes:

 

[enigmahack]

Sarah, that alg is awesome... I was also using the Rw2, B2...

Thanks for that