Thanks David. The Assembly constraints doesnt want to recognise the sweeped face when you click on the two different items.
I do believe its supposed to work. Dont know how to explain this but to me its very logical. From what I've learned in Alibre I know a point/node/line tends to stay on the spline when you give it different dimensions. (though this is in 2d sketch mode) But I think Alibre cant calculate so many movements simultaneously? Explanations from this website: http://encyclopedia.thefreedictionary.com/Tangent makes you think about all the calculations behind these programming codes. Im not a programmer and dont know how these codes and calculations work but I believe it is possible!