svasature leaving the asola

[Rossano.Nana]

Good morning to all,
I am an inventor's neophyte and I should perform a hole with a devasation that starts from an asola and rastrema towards a circular hole of the same diameter of the semicirculations of the starting asola. Can someone tell me how I can do this?

thanks to all for suggestions
reddish

 

[Rossano.Nana]

I solved using the "loft" command.

 

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maybe by posting some pictures you would have been a little lighter