How to apply a fillet on the curved surface?

simon_vold

hi, i have no cad training and are only self taught and relativly new to onshape. Trying to create a fillet here is not possible, what would be the best solution? i see the surface is weird, probably because i used a mesh to hollow out a block and then shelling it.

link: https://cad.onshape.com/documents/2106c3f6f437e61c9d61c279/w/ac157bac954347663d64529d/e/d6176643238c32494958dfe9?renderMode=0&uiState=6851d75bf93b787e38f7e581

GregBrown

Currently it is not possible to fillet an edge that is adjacent to a mesh part. You can, as you have already shown in your model do many geometric operations (split/boolean/extrude/etc) that involve mixed models, however filleting is not one of them.

MichaelPascoe

It appears mixed modeling parts or parts mixed with meshes can't be filleted since those "edges" aren't recognized as edges in Onshape yet.

Since this is a pretty simple part, one approach would be to re-create the part as a solid. A nice trick for converting those points to a smooth spline is to slice the mesh as you have, but then use the Fit spline feature to approximate the profile of your slice.

In this example:

• I created a plane along the mesh points of the part, this way it would be as close to normal for the profile.
• Then I sliced the part with that normal plane.
• Next, approximate the profile using the Fit spline feature. (Shift + C) shows the curvature tool. You don't want any jagged spikes, this will mess with the downstream fillet.
• Approximate another spline for the sweep path.
• Use the Trim curve tool to extend the path a small amount.
• Sweep the profile
• Replace face, or split, to clean up the ends

https://cad.onshape.com/documents/6b11ac18d7217e60a1f96a14/w/442492af109e1c8cc258f862/e/16f5398f4328cecd911e8…