nut or groove problem

 From:  mike (MIOHN)
4992.1 
hi,

any help out there?

I cannot create a groove ( in deutsch "Nut") on this surface where the cuts are going along.
Whatever values I try it calculates very long and then nothing happened.

I want to get a beveled gap between these surfaces.

What I'm doing wrong here?

thanks
Mike
Attachments: