Adding inside corner relief?

[tomae]

What is the easiest method for adding an inside corner relief?  Often with metal parts one relieves an inside corner (with a cutoff wheel or slitting saw) in order that the corner radius does not interfere with a close fitting part.  Is there an easy way to realize this in Fusion 360?  I have been going to the side profile of the corner and drawing small rectangle at 45 degrees to the edges and then extrude-cut that rectangle down the corner.  This is tedious and also prone to being screwed up if the corner dimensions change.

Seems like there should be a Relief function under the Modify menu, but I am wondering if there is an easy way to do it that isn't obvious to me?

Thanks

-Tom

[gautham_kattethota]

Hi Tom,

Are you using SheetMetal functionality in Fusion360?  If so, the ability to control corner reliefs (shape, size and placement) for a sheetmetal part can be done in one of two ways - specify the corner requirements in the Sheetmetal Rules command or override the corner requirements for a specific flange feature in the Flange command.  

1. Sheet Metal Rules: The Sheet Metal Rules command can be found in the Sheetmetal workspace (use the workspace switcher to switch to Sheetmetal) under the Modify dropdown. You can select the rule you want to use and change various parameters, including Corner Conditions.

2. If you want to override the corner specification for a particular flange feature, you can use overrides in the Flange command.  The Flange command can be found in the Create dropdown in the Sheetmetal workspace .  When you select edges from a sheetmetal body, you can check the "Override Rules" box which exposes various options, including overriding corner reliefs.  Please see attached pictures.  

Hope this was helpful.  If this is not what you were looking for, please let us know.

Regards

Gautham

[tomae]

I’m not using sheet metal. I am talking about a 90 degree inside corner of a solid.
Thanks,
-Tom

PS:  attached simple example of what I do now....

[lichtzeichenanlage]

My approach is similar to the one from @chrisplyler I just used a lazy sketching style 😉

[tomae]

Well, unfortunately, I guess the answer is “post a feature request”.  

Thanks for the over-explained 😉 video on good drawing practices.  You definitely win the prize on a thorough explanation of the right way to do the manual method!  I LOL at the end 😀

Thanks for the replies all.

-Tom

[chrisplyler]

Glad to help where I can.

I do think a "relief" feature makes a lot of sense, and doesn't seem like it would be too hard to impliment as it could basically function exactly like a filet or chamfer. I never thought about it before, but now that you've brought it up it seems like an obvious thing that they just hadn't thought about. If you put it in the Idea Station, link to it here in this thread and I would definitely vote for it.

Like @lichtzeichenanlage pointed out, the exact method of laying out the sketch doesn't matter. What does matter is that you use a bit of logic along with the constraints available to you to make sure it behaves as you desire under any foreseeable circumstances.

[tomae]

Ideastation link:

https://forums.autodesk.com/t5/fusion-360-ideastation/inside-corner-relief-function-in-modify-menu/i...

[chrisplyler]

I votereted for it!

[johnAMKDR]

Seven years later and I'm looking for the same thing.

My immediate application is for 3D-printed parts that will be glued together. I have been putting small circles at the corners. This seems a little easier (CAD-wise) than the methods shown in this thread, but probably not so nice for machining a part. .. Or maybe you could dive down on the corner with a small diameter end mill.

I've also wished for this for some metal parts to be vacuum brazed. The solution was to break the edge of the interior part. I will probably do a similar thing on the 3D print and put fillets where the part meets the corner.