Need help with chamfer on enclosure please

[salesMUBBN]

Hi,

I am laying up a small plastic enclosure FOB and somehow have dome something wrong at some point in my design. I am unable to chamfer the bottom of the base part. I keep getting error :  Chamfer could not be created at the requested size. This might be occurring at the ends of selected edges.

How can I fix this please?

[jhackney1972]

I isolated the Base Component from the assembly and created a Chamfer, on the bottom edge, using a Sweep of a triangle sketch.  The sketch is dimension as 2 mm per side right now but you can change it, within limits, as desire.  You can see the process in the attached file so you can add it to your linked model. 

[salesMUBBN]

Sorry, I meant underneath on the base outside, not the inside

[jhackney1972]

You need to be more clear when you make a request.  The process is basically the same except for the corner beside the end tab.  This was done using surface patches and Combine, then mirror.  Model attached.

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[salesMUBBN]

I am new to Fusion 360 and have not used surface patches. Other designs I have done I could simply chamfer or fillet the edges as desired. What causes the need to use surface patches?

[salesMUBBN]

I'm also having trouble finding the surface pacth command the menu system. Online tutorials show it under the workspace dropdown but I do not see it there.

[etfrench · Accepted solution]

The problem is the short line segment by the tab.

I added tangent constraints at each end of the arc which made the endpoints of the arc inside the tab. The tab extrusion also had to be extended by editing the Extrude feature and making it two directions.