Problem with Mirroring Features

[jhackney1972]

In the attached model, I am attempting to create a Mirror of the last three features in the timeline about the 45 degree plane, at the end of the timeline (Plane2).  The Mirror is successful with the Extrusion and the Chamfer but refuses to Mirror the Fillet.  If I use Mirror Faces, it works perfectly but not being able to Mirror features does not seem right to me.  I would appreciate someone letting me know why I cannot Mirror all the three features only Faces.

[HughesTooling · Accepted solution]

My guess would be because the intersection edge you pick for the fillet ends up on a different surface after the mirror it fails. If you use a Rule fillet instead and select the face it works because after the mirror the fillet is looking for an intersection with the face not an edge.

File's attached.

[HughesTooling]

If I recreate using a loft instead of a sweep so it's a single surface it also works. So I think the problem is down to the intersection ending up between the face on the cylinder and a different surface is the problem. File's attached again.

[jhackney1972]

Mark,

I like your first solution the best.  The reason is this model is for a Fusion 360 beginner I am trying to help get up to speed and I really do not want to go into the Loft command just yet.  This model was a simple exercise to introduce the Sweep command and I just got into the mirror situation as we were finishing up.  We backed up and finished his model using a second fillet but I needed a "plausible" reason for the failure just to keep my sanity.  Thanks a bunch for your effort.