Ok, I'm a bit late, but I had a go on the calculations tonight.
I uploaded a very simple Excel file I've made tonight and that you can download.
https://drive.google.com/file/d/0B-iOekLVikV5YkR3SHZxQVl5dTg/view?usp=sharing
Fill the cells B1 and B2 with the right values, and you will get the number of turns you need to move your drag link from a 0° camber in cell B4.
- R = distance between the lower pivot point of your upright (centre of the lower ball joint), and the intersection point between the drag link's longitudinal axis (centre line of the threaded part) and the axis passing by the 2 pivot point of your upright (or passing by the centre of the lower ball joint, and the centre of the ball of the upper drag link).
- Alpha is the camber angle from 0° camber (vertical axis) you want to get.
- Pitch is the pitch of the drag link thread (1,5mm in the case of a Transit drag link)
You can use only the first table if you start from 0° camber. But in your case, you start from 1,5° camber and want to achieve a 0,5° or a 0,3° camber, so if you set the first table with the values of what you have now (position1, R and 1,5°), and the second table with the values of what you want to achieve (position2, R and 0,3° or 0,5°), cell B11 will give you the number of turns from position 1 to position 2.
I don't know which uprights you are using, but in the case of Sierra front uprights, R is about 201mm, and the alpha, when camber = 0°, is 11°. to have a 0,5° camber (R=11,5°), the calculation gives 1,14 turns, so it corroborates what has been said.
Hope this will help
[Edited on 18/1/15 by voucht]
[Edited on 18/1/15 by voucht]