MindCuber - build your own LEGO Rubik's Cube solver

Schmidt said:
Now we just need a way to link it to PPT to make it the "Lazy Cubers Ultimate Scramble Device"
Maybe some other words to make a cool a.c.r.o.n.y.m.
Click to expand...

Cool idea - how about calling it "MindScramble" ;)

Michael Womack said:
i had trouble with that one and im trying this one just finished mine about to program it
Click to expand...

Cool - it would be great to hear how it goes... :)
 
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Michael Womack said:
trying to get it to work but the cube rotating arm sometimes fails to grab the cube
Click to expand...

A few thoughts....

Can you describe this more completely?
Do you mean it sometimes lets go of the cube as it is pulling it to tilt it?
Or does the arm fail to drop completely flat after the previous tilt?
Or something else?

Did you carefully align the turntable as described in the "How to..." before the solve? Are you using a standard Rubik's Cube or another brand?
 
IAssemble said:
A few thoughts....

Can you describe this more completely?
Do you mean it sometimes lets go of the cube as it is pulling it to tilt it?
Or does the arm fail to drop completely flat after the previous tilt?
Or something else?

Did you carefully align the turntable as described in the "How to..." before the solve? Are you using a standard Rubik's Cube or another brand?
Click to expand...

I dose not grab the cube the arm just slides over the top of the cube
 
Michael Womack said:
I dose not grab the cube the arm just slides over the top of the cube
Click to expand...

Thanks for providing more information.

Does the arm always drop completely flat so the bar is over the edge of the cube before it tries to pull it back?

Are you using a regular Rubik's Cube or is it a different brand with more rounded edges?
 
Michael Womack said:
ya it drops well and using a rubikis brand
Click to expand...

Does the cube start to tilt at all before the arm slides over the top?

Would you be able to share a video with me via your YouTube channel showing a few examples of the failure so that I can see it to try to help work out what might be the problem?
 
Michael Womack said:
the cube works the same way as your video
Click to expand...

I was suggesting that if you upload a video showing some examples of the arm sliding over the cube during an attempted solve I might be able to see a reason why it isn't working as well as it should and maybe suggest a way to improve it.
 
Thanks for uploading this video of the problem you are having with MindCuber. Your modification is interesting but should be unnecessary.

I can see at least one tilt that it still misses which would explain why the cube is not solved at the end.

I'll try to work out why it was originally failing and leave comments on the video itself if I see anything...
 
Gredore said:
Does it use an optimal method ,a method used by cubers or a method that is small in memory as too fit onto the NXT?
Click to expand...

Thanks for asking.

It is certainly not optimal as there is not enough memory on the NXT for tables to make this practical in a reasonable time.

I will make the source code available on mindcuber.com at some point but here's a brief description that I wrote in response to a question on YouTube about whether it was using "a non-color neutral Petrus":

It is overall color neutral in that it solves the cube up to 24 times starting in all 4 orientations of all 6 faces and picks the shortest of these solutions (or stops early if it finds a good one). It is one of my own table-driven algorithms. I have just read about Petrus and it does sound somewhat similar. Essentially it has 9 stages (9 "looks"?) - two get to 2x2x2, next two to 2x2x3, next three to F2L, next does 4 LL corners and last does 4 LL edges.

I hope this makes sense?

In tests it averages around 42 moves.

So it is a method I developed myself to fit into the limited memory of the NXT (the lookup tables total about 12K bytes I recall compared with around 300M bytes for CubeStormer II ;)) and produces shorter solutions than typical human algorithms I believe.
 
Michael Womack said:
Click to expand...

Thanks for sharing this video of my MindCuber design to try to diagnose the problem you are seeing.

Your modification is cool but should be unnecessary and in fact I think it might cause extra problems with reliability.

I think I can see the cause of the problem at 0:08 The levers under the tilt mechanism are connected to the wrong holes with the wrong type of peg. Please check the steps on page 100 and 101 of the instructions carefully and let me know how it goes.

I hope this helps :)

Thanks
 
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