E to E Spacing on Nut

Calling all experienced nut cutters.

I've been working on cutting a nut from a bone blank for my USACG neck.

Nut width is 1.65"

Questions:
what e to e spacing do you use?
how are you measuring it? (center of each slot to the other OR space between E strings when those two strings are put on?)

Yes, It's probably splitting hairs and up to preference, but I'd like to get it right. I've messed up several blanks already goind too deep on the D string.

There are all sorts of Fancy Methods out there for what you ask...but the simplest way, is to just find a Guitar where you are really comfortable w/ the Nut spacing, and how it feels...and just mark the slots carefully on the backside of a business card, and transfer to your new blank.

That's a pretty good shortcut, finding this guitar may take a bit of time for me.
I wanted to finish the nut tonight if possible.:lol:

This might help some ?
Click Here (http://www.stewmac.com/freeinfo/Nuts,_saddles/a-nuts.html)

I think its just feel, because so many variants and personal preferences, such as.

1. if you are an aggressive player and bend strings a lot, you may likely want a narrower total spacing.

2. if your frets ends slant down (over shaped frets on the ends) you may want narrower total spacing.

3. Radius of neck, if you have 7.5 radius you may want more narrower spacing.

Its all what you like.

Once you space the two E's based on your needs, you can take into account string size, so the spaces are not all the same (wound strings get more space), but the space between each string is the same.

On a typical 1.65 width at the nut neck, your spacing E to E will be 1 + 3/8ths inches.

This'll give you about 9/64ths inch between each E and the edge of the board. If the edges are heavily rolled you'd need more.

I like each slot precisely the same distance apart to its neighbor, across the nut.
I've played nuts where fatter strings got extra space to account to their added with, I did not care for that.