"Error: Fillet cannot be created" on "D" shape sketch.

[Christosnsns]

I am trying to make a fillet on the "D" shape sketch which is shown on the picture. I get an error trying to do it. Could someone help me please?

[Warmingup1953]

Save your work. Constrain your sketches. Don't use fillet in sketches unless your life is in danger!

[jhackney1972]

Please attach your model and fully explain the size of the required "Fillet" and where it goes on the model.  If you do not know how to attach your Fusion 360 model follow these easy steps. Open the model in Fusion 360, select the File menu, then Export and save as a F3D or F3Z file to your hard drive. Then use the Attachments section, of a forum post, to attach it.

[Christosnsns]

Thanks for your quick reply, I just followed your instructions and uploaded the f3d file with the shape I would like to put the fillet on.

[jhackney1972]

A lot of missing information, what size fillet?  I assume it is on the ends where the arc meets the straight line.  Normally fillets are added after the sketch is turned into a solid but if required it can be done in the sketch but not using the Fillet command.  The radius of the fillet I used is 2.5mm. Model attached.

[jhackney1972]

Here is the same model, Extruded to a 5mm thickness and then two 2.5mm radius Fillets applied to the solid model.  This is the preferred method of modeling Fillets.  Model attached.

[Christosnsns]

Yeah I would like to make the fillet on the sketch where the arc meets the line. I wasn't looking for the dimensions because I was struggling for quite a lot with it and I also did it myself after I extruded the sketch. Thanks for your reply again it really means a lot but I would still like to know how to do the fillets on the sketch.

[jhackney1972 · Accepted solution]

Here is a video on the process I would use, there are probably others, to put fillets on your sketch.

Edit: At the end of the video I added the large arc radius, the radius I should have added is the radius of one of the end arcs, they are tied together so they will update.  The large radius dimension is not needed.

Her

[Warmingup1953]

You certainly can create a fillet"""using the arc commannd then constrain as tangent and dimension:

But always remember that your sketches should be kept as simple, curt and concise as possible,

[Christosnsns]

I feel thanks is a small word to tell but I know no other. Thanks. I feel obliged by the help and assistance you provided. I see that the problem is with the program because when I make a rectangular form shape it works right up the fillet command. I will accept your solution and next time I'll make fillets after extruding it.