Hi Psygorn,

Yes the 3dm you posted is what I want. How did you do that?

Michael:

There are a few different ways of defining fillet "width" like radius, chord length, and arc length. I think what I'm asking about is something like defining the fillet width as the distance between the theoretical sharp corner and the tangent edge of the fillet:


- Peer

Hi Peer,

re:
> I think what I'm asking about is something like defining the fillet width as the distance between the
> theoretical sharp corner and the tangent edge of the fillet:

Unfortunately I don't know of any CAD programs or libraries that define it in such a way.

The most standard definition in CAD is that the fillet size is controlled by a radius value, and the radius value is expressed as an offset distance of each surface, then the offset surfaces are extended and intersected to form the fillet centerline rail.

That gives the so-called "rolling ball" type fillet shape.

It's not really feasible to experiment with replacing just one aspect of filleting with a different definition because it's an overall complex mechanism with interconnected dependencies on handling corner juncture pieces.

The closest thing that could be experimented with is if your alternate width definition could be expressed in terms of surface offsets at any given point and then that might be formulated as a variable radius fillet.

- Michael

Hi Michael,

Thanks for confirming that there aren't any CAD programs that define fillet width in this way. That's sort of what I figured and was not suggesting that MoI be changed to do it like this. Just thought someone here on the forum might have a trick to avoid these troublesome mismatches when making appearance models. For most stuff I have to stick with constant radius fillets since anything involving variable radii is troublesome to machine.

Also, thanks for the peak into how filleting works. That's pretty interesting about how the rail is made.

- Peer

Hi Peer.

I do it this way...

Hi WN,
Your method is interesting. what tool do you use to make your video?

Hi Zooen.

"what tool do you use to make your video?"

https://getsharex.com/

Thanks WN! That's a clever method you came up with.

- Peer

Very tricky!