Hi jetblast, the more that I look at your case there, the more uncertain I am of exactly what kind of result you want to have...

It seems like it will be difficult for the fillet to go down to zero radius at the tips there and still interact very well all the other surrounding surfaces.

If you have a piece like this:




That will make the "taper to 0 radius" part have to be a sudden shift in shape and try to abruptly taper off, that has some difficulty.

If you try to make it do it more gradually, then it's probably difficult for it to fit exactly within the available space... it would still probably have to be a sharp corner in that area similar to the ViaCAD screenshot above, probably some of the fillet would be sliced off...

- Michael

I got a pretty good result in ViaCAD by using the By Position option under Variable Blend. The orange coloured face was done this way with a 1mm radius near to the middle of the edge and 0.01mm radii close to each end. It looks as if ViaCAD's fillet engine fades the radii to zero at the extremities from what I can see.



Martin.

Thanks guys !


bz

Hello,

Is something like this helpful?

Yes, that's what I was looking for.

Please show me the 'magic' .... lol

Hello jetblast,

Please see the attached image. First create a rectangle, fillet the corner of that rectangle closest to the edge you will be using to create the filleted corner and center and align the rectangle to that seam. Run the Sweep command using the rectangle as the profile and the arc edge as the rail. Before completing the command make sure to select Both Pointy under the Ends tab of the Sweep command. You should be left with a shape that looks similar to the one pictured. Select the two outside and two inside faces and delete those, leaving the fillet shape. Run the Trim command using the swept fillet as the trimming object against the solid. Hide the swept fillet, and delete the two trimmed faces. Unhide the swept fillet and Join the fillet to the rest of the object to create a watertight solid. I admit I was thinking about this a while to come up with something that worked, it might even be interesting to experiment with scaling rails on the sweep to see what other shapes are possible.

Tricky!

Good solution OSTexo,

I come across this problem occasionally too and there is no easy way to solve it with conventional tools.

Your post is very clear and easy to understand.

VERY COOL, OSTexo !!!


I took the easy way out .... lol

Not what I exactly wanted but I can live with it.

I like your solution better.

Hello,

Glad I could assist. I'll have to keep this technique in mind in case I run into a similar issue with filleting.

I down loaded a trial version of ViaCad and stumbled my way through to get something close to what I have in MoI. It gave the same result as MoI
but it did allow me to radius the outside edge (0.5 R) where as in MoI, it tried, but it didn't finish the deal ...

Hello jetblast,

You could keep that fillet that MoI generates and use it to Trim away and delete the undesired part of the solid. Then try to Join that fillet to the rest of the surface to see if it's watertight.

Hi jetblast,

> where as in MoI, it tried, but it didn't finish the deal ...

It looks like MoI's filleter got confused in the part of the process where it cuts away space in the main object.

When it runs into an error like that, it still returns the fillet surfaces that it was able to generate so you can use them, like OSTexo mentions above you can probably use the Trim command to cut the main object and then join the fillet into place in that case.

The geometry library that ViaCAD users does tend to handle a lot more fillet corner juncture type cases than MoI's though so it's not a bad idea to use it to assist with filleting like that.

- Michael