Fillet Issues - Curved Face

[bricechart]

I'm having trouble creating a fillet on a somewhat simple object. I'm wanting to round the edges of all the sides of the part. When I try applying the fillet on the side (PartDesign -> Fillet), I get gaps where the fillet was supposed to be created. Any thoughts on what I'm doing wrong?

The side I'm having issues with the fillet, pre-fillet.

Fillet Issue 1.png (12.65 KiB) Viewed 628 times

Missing part material on the curve, post-fillet.

Fillet Issue 2.png (41.63 KiB) Viewed 628 times

OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.13541 (Git)
Build type: Release
Branch: releases/FreeCAD-0-17
Hash: 9948ee4f1570df9216862a79705afb367b2c6ffb
Python version: 2.7.14
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.2.0
Locale: English/UnitedStates (en_US)

[bejant]

The arc in Sketch not being tangent to the adjacent line segments is cause of your Fillet problem, but other than making the arc tangent I don't have a fix. Maybe someone else will come up with something...

[Forthman]

there is a mistake in your sketch you can use "validate sketch" in part design menu

[GeneFC]

I did not see any "mistake" in the sketch other than the lack of tangency.

I think bejant is exactly correct. The PD fillet behavior is known to be a bit weak, and this is one of the situations it cannot handle.

Gene

[bricechart]

I did not see any "mistake" in the sketch other than the lack of tangency.

I think bejant is exactly correct. The PD fillet behavior is known to be a bit weak, and this is one of the situations it cannot handle.

Gene

So having the curve tangent is required for the fillet option to work? I adjusted the angle and the fillet now works, but I just trying to know what my options are. Thanks for everyone's help.

[bejant]

So having the curve tangent is required for the fillet option to work?

The Fillet often (usually?) fails in those non-tangent situations, so I'll answer "yes" - and no exceptions come to mind.