I'm playin a LeGrande II with the little Hex screws at the end and am very appreciative of being able to split tune several notes on both necks.

However I am finding it impossible to visualise what is actually happening ... ie:
the physical action of each component of the split tuning arrangement. Has anyone got, or can draw, a diagram that might explain it?

Thanks Michael

Here is another way of looking at why a split usually comes out sharp, before you tune it. Follow along:

1. look at the travel on the 3rd sring pull rod when you engage the B pedal.

2. Look at the traved on the 6th string pull rod when you engage the B pedal.

Why is the travel sooooooo much different, yet both strings are only being raised a half tone? Ok, the answer is, the higher the pitch the more travel required to get the same amount of change in pitch.

Now carrying this a step further. When you raised the G# to A you have "X" amount of travel. When you lower the A to G with the knee lever, you have "Y" amount of travel.

Because of the above physics the amount of Y travel is less than twice X travel. So it is not enough to lower the A fully to G. So you have to flatten it with the "lower" nylon tuner at the end plate.

This then makes the G# to F# too flat. Thus the reason you have to pull it back up with the allen screw; or extra raise rod on some guitars.

Further physical evidence of the phenomena is to look at the fret separation between ANY three contiguous frets. The middle fret is never exactly half way between the outer two frets.

carl

[This message was edited by C Dixon on 31 March 2004 at 10:07 AM.]

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Michael
Emmons LeGrande II D10 8&5
'75 Fender Sho-Bud S10
3&4
Session 500