topic Re: can not make a filet in Fusion Design, Validate & Document Forum

can not make a filet

Anonymous — Sun, 04 Feb 2018 03:06:54 GMT

can not make a filet

Re: can not make a filet

laughingcreek — Sun, 04 Feb 2018 03:42:54 GMT

It's hard to say with out the file. Have you tried clearing the yellow error on the loft? occasionally those will prevent things from working.

post your file if that' not it.

Re: can not make a filet

Anonymous — Sun, 04 Feb 2018 03:51:43 GMT

how do you post a file?

Re: can not make a filet

laughingcreek — Sun, 04 Feb 2018 03:54:57 GMT

from the file menu, export a fusion arhive file (.f3d) and attach to bottom of post

Re: can not make a filet

Anonymous — Sun, 04 Feb 2018 04:20:30 GMT

here is the file

Re: can not make a filet

laughingcreek — Sun, 04 Feb 2018 05:06:24 GMT

I'm at a loss as to why the "constant radius" fillet can't be made bigger than .05. You can change the fillet type to "cord length" instead (a better fillet type for this type of situation anyway) and get a much larger fillet.

Re: can not make a filet

Anonymous — Sun, 04 Feb 2018 05:09:44 GMT

actually i trying to make a smaller filet like .12

also you can not thicken the part .

Re: can not make a filet

laughingcreek — Sun, 04 Feb 2018 05:50:16 GMT

I guess you could make it a solid and shell it. have to do the shell before making the visor though, which may not work for what your trying to do. here's a screen cast of what I mean. you can also do the fillet with this method.

Re: can not make a filet

laughingcreek — Sun, 04 Feb 2018 06:04:17 GMT

never mind. you can do the visor before shelling.

Re: can not make a filet

Anonymous — Sun, 04 Feb 2018 14:29:13 GMT

Thank you for showing me a at another way to do it . below is link from the autodesk design Academy

https://academy.autodesk.com/curriculum/f1-schools-helmet-design

Fusion 360 Adding Detail to the F1 Helmet Part 2.mp4 from frame 5.26

i follow they they instruction . and they where able to do it .

Re: can not make a filet

jeff_strater — Sun, 04 Feb 2018 15:18:50 GMT

I took a look at this helmet design. I agree with @laughingcreek that there are better ways to design this helmet, and those videos are good examples. But, I looked at the design as you had created it, and I understand why the fillet has problems. It all goes back to the surface created by the loft. There is a lot of bad geometry in part of that surface. You can help this a bit by adding rail curves to help guide the loft.

screencast:

Jeff

Re: can not make a filet

jeff_strater — Sun, 04 Feb 2018 15:40:35 GMT

found something interesting while trying to track down the reason that loft feature was showing an error. If I re-create that loft, I get different (better) geometry, and can apply the fillet:

very strange...

Re: can not make a filet

laughingcreek — Sun, 04 Feb 2018 16:10:40 GMT

@jeff.strater-

Funky geometry? yes. Because of the loft? No. I ran into this problem a while back, and couldn't get an answer then either. But I have since stumbled across the solution. Don't know why I didn't realize it applies to this case also.

The problem originates with the T-spline. Geometry around the star points is always a little wonky. Making a cut to close to one creates an edge that is problematic to loft from. And it can be hard to see. The solution is to further subdivide the area on the original t-spline before cutting it. This gives a better edge that creates a better loft.

(I just did the one t-spline body in the OP's file, but should have done both. Also, I didn't look at the lesson the OP was working from, but if his file is a true representation of the intended workflow, it's full of bad advise on how to get a good model. That might should be looked at also.)

Re: can not make a filet

laughingcreek — Sun, 04 Feb 2018 16:16:45 GMT

just saw your follow up post jeff, we're tripping over each other. I still think the t-spline body is originating this issue. You get nice clean edges if you subdivide both surfaces before cutting.

Re: can not make a filet

jeff_strater — Sun, 04 Feb 2018 16:24:06 GMT

@laughingcreek, you are probably correct. I didn't trace it back to the TSpline, but that makes sense. Your solution is better!

Jeff

Re: can not make a filet

laughingcreek — Sun, 04 Feb 2018 18:24:11 GMT

Just want to drive this home. Recall I subdivided the outer shell, but not the inner shell. Here is what the curvature combs look like. As you can see, there is the tiniest little bit of jigger still on the cut edge for the inner shell. This is enough to screw up surfacing commands, and close to impossible for someone to find unless they know to go looking for it.

It would be good if fusion were robust and smart enough to know that a little kink in an edge, that isn't even visible, needs to be dealt with. maybe a setting in the dialog boxes to smooth such things that would work similar to the tolerance setting in the stich command. At least highlight the point of failure for goodness sake.

Re: can not make a filet

Anonymous — Sun, 04 Feb 2018 22:01:08 GMT

thx every body for helping me

. i redesign the helmet as a solid model . can still not make a filet .

i imported the fusion file in solidworks . from there i was able with no problem to make two .12 fillets with no problem .

than re import the file in fusion and the filet are fines .

must be a bug in the software .

but thank again for the help .today learn How , to use the Project /include intersect .

and to use the curvature comb

also i could not figure out out to insert a screen cast inside this reply .

Re: can not make a filet

Anonymous — Sun, 04 Feb 2018 22:18:06 GMT

here is the screen cast