Hi Michael,

thanks for the explanation and... you are right. I used network and sweep to simulate fillets just because, I suppose, I'm not skilled enough in filleting :-(
I use solidworks daily ant it makes fillets of all king in a click, no matter of the complexity and geometry errors... It automatically adapts fillet radius at the model: it's pretty different from moi, so I've to learn more about filleting!
So this night I've dealt with it a bit to undestand... no solved very much, but I've learnt some new stuffs.

Thanks for your effort. Let me study your last posts.
Marco