HI Michael,

Just wonder if you can quickly explain in simple terms :) or point me in the right direction why I have trouble filleting the underneath edges of the resulting shape via revolve command

Cheers
Steve

Hi Steve - there's a bit of irregularity in the shape near the tips, if you look closely right at the tip here you can see it's slightly pointed:



That's not good for filleting, because any sharpness between edges like that means that fillets generated from them do not touch exactly and need to have a corner patch put in between them, and that tends to be difficult for it to figure out when it's only going to be a little slivery patch piece.

So to tune that up, you want to go to this area of your profile curve:



And get these points here to be all in a flat line with one another instead of slightly zig-zagging around:



You can do that by grabbing one corner of the edit frame and squishing it down until you get "flat" snap. The other end of the curve also needs that done as well to make the revolve nice and smooth on the other end.

I've attached a 3DM model file with that done to it, and it will now fillet but you'll be limited to a pretty small radius of something around 0.1 units, because much more than that and these tightly bent areas that you have will start to collapse in on themselves:



If you want to fillet it, you may want to make these tightly bent areas to instead be totally sharp corners in the initial revolve and then fillet them at the same time to round them off:



- Michael

Thanks very much Michael.

Your advice and support is so impressive ,really can't get over it

BTW as you said making that little outset with straight edge allowed me to bevel to 0.2.


I was under the impression that rounding edges actually helped filleting.

Hi Steve,

> I was under the impression that rounding edges
> actually helped filleting.

If it's a tight bend that's basically resembling a fillet, it's usually best to actually let it be filleted as well.

If it's quite a bit broader of a bend than the fillet radius that you want then it's fine, but tight bends make things difficult for the filleter because basically a fillet has some similar qualities to an offset that it wants the fillet to hang off of the surfaces at a particular offset distance of the radius that is being used.

When you have something hanging off of a curve and the thing is larger than the curvature of the bend in the curve it causes this kind of bunching/self-intersecting type effect which then makes things difficult for the filleter in those areas:



- Michael

Oh great, thanks for the explanation

Steve