Can anyone tell me why I can't fillet this

I know I've asked for help on this one before. I got the curved dimple right but I can't seem to fillet it to the plate, no matter how small the fillet radius. Any idea why? By the way, the curved plate and the dimple are not UNIONed, please union then fillet if you can.

WhyCantFillet.dwg

worked fine for me. I did a fillet on the 4 vertical edges of your plate first. then i did the top edge with a radius of .5, chain, and it did the whole top fine. The bottom edge i had to reduce the radius to .4.

It's the dimple that I want to fillet so it will look like something like this.

Notice the smooth transition. (I think this was done by mugshot)

I'm using 2002 by the way.

first you have to union your plate and your dimple. there is a small amount of space between the back side and the plate that will cause a little issue, but everything was able to fillet okay. Look at the attached wireframe image. you can see a black circle and blue circle. this is the gap between the backside of your dimple and plate. you need to fix this before you go any further.

The gap you're referring to can be fixed by union, correct? I realize I have to union the dimple and the plate first before filleting, and that's what I did. Then I even set the fillet radius to .01 , but still the same error message:

Failed to perform blend.

Failure while filleting.

What version are you using? Is it possible that later versions can fix things a lot easier than old versions?

the version shouldnt be a problem. I am using 05. The gap cannot be fixed by union. If there was interference or overlap, yes it would be fixed during union, but it will not fill a gap. I had no issues with the fillet. The gap is not consistent around the part. if you look at my wire-frame it actually crosses so you will have sections of intersection and sections of gap