[jonogt]

I'm going through some of these from an old homework assignment (i'm in a structural materials class) and I have no problem with how to solve and get your miller index with reciprocals and simplifying fractions etc., but I don't know how they are initially deciding which corner of the cube to use for the origin.  I've looked at a lot of different criteria, as well as tons of websites, and it seems flat out random to me. even online I can't find any info at all about how they decide, and it affects the +/- of the answer, so it's a bit of a problem...

any ideas?

thanks
-Jon

[eugenedakin]

Hi jonogt,

Here is some more information which may help:

http://en.wikipedia.org/wiki/Miller_index

Sincerely,

Eugene

[jonogt]

I did find that article earlier... it talks quite a lot about the concept, but nowhere does it give reasoned out examples or anything about how to actually select your origin point. 

[eugenedakin]

Hi jonogt,

Yes, your right. Most of the examples are symmetrical, and it does not matter which point they start with.  Do you have a specific example that could be loaded on the site so that I could see it?

Thanks for your help,

Eugene

[AWK]

but I don't know how they are initially deciding which corner of the cube to use for the origin.

In the case of cube you can take any corner as origin

[me_mskhan]

In progression of this topic I would like to know if in cubic crystal structure planes with miller indices (-102) and (10-2) are parallel planes?
Moreover, does Miller index for a given plane in a given system can be changed with changing origin?