Filleting. What am I doing wrong?

I’m a basic user and struggling with filleting. I can make fillet edge, surface and variable fillet work on very basic geometry but can never get any of them to work on anything that involves more than two surfaces coming together. I’m obviously doing something wrong but have tried modelling from solids and surfaces and filleting individually and simultaneously but the results are the same. Specifically I have been trying to fillet the attached with 6mm radii on the shoulder and 2mm everywhere else, I even tried a more basic form (in the background) but even this wouldn’t fillet more than 2 surfaces. Any guidance would be greatly appreciated or if you could point me in the direction of an in depth tutorial that would help.

Thanks

Neil

Start with the larger radius fillets first, then the smaller one.

Not infrequently manual trimming of fillet surfaces is required.

Sometimes fillets around the intersection of three or more intersections fail because of the complexity of how the fillets intersect with each other.

Post a .3dm file with your geometry and someone will probably provide specific guidance.

Try using FilletSrf instead of FilletEdge and then Trim the results.

This white paper has been around a while but it still is helpful for learning how the tools work:
https://wiki.mcneel.com/rhino/advancedfilleting

1 Like

Hi Neil - please post your example file.

-Pascal

Thanks Pascal.
Here is one of my unfilleted models. This one was created as a quarter from “surfaces from network of curves” and mirrored. The shoulder needs to be 6mm, the rest 2mm.

NH Fillet Challenge.3dm (3.5 MB)

Thanks John, this looks like it might be very useful.

Thanks David. I did start with the larger fillets and work down and I also tried filletSrf but couldn’t get trim to work with the resulting surfaces. Hopefully the White paper John has pointed me to will help.