Hi, I’m having an issue with filleting a simple edge radius. I’ve done this a thousand times but this one is stumping me. As you can see, my shape has an acute angle along a curve and I don’t know why it’s not allowing me to create even a simple .125" fillet. I tested a much sharper angle on a different straight solid and it worked fine. Any help would be GREATLY appreciated. For the record, I’d actually like the fillet to be .75".
Thanks!
Hi Chris - please export the object and post the file, indicating the edges you’re working on.
-Pascal
How do I share the file? I don’t see a place to post it.
Hi Chris - in your reply, poke this button:
Drag and drop should work as well.
-Pascal
LOL. Thanks! What format would you like the export?
Just the Rhino file - export to another file if the file is large and complex - the idea is just to post the stuff you’re asking about not the whole project…
-Pascal
Gotcha! Here it is. I would like to fillet the top to a .75" radius.Fillet.3dm (98.3 KB)
Hi Chris - the problem is, the curves defining the top shape are not tangent - 1-2 degrees off - that sets up a situation the edge filleter does not always handle well, admittedly, but probably the intent is for the curves at least tangent - I’d fix that.
-Pascal
Is there an easy way to make the curves tangent?
Also - how could you tell that they weren’t tangent?
Hi Chris - the Match command as well as the CurvatureGraph & GCon, will help a lot. The graph shows another problem here:
where the curvature spikes suddenly - if you check the curve there as it approaches the corner, the radius drops to about .06 inches , which is really the likely problem - the fillet cannot negotiate that tight curvature cleanly. Basically you need to be more careful about drawing these curves, is what it amounts to. If you are not familiar with the concepts of tangency and curvature, (both important to surface modeling) you might take a look at the chapters on curve and surface continuity here:
Your curves can be greatly simplified as well.
-Pascal
Thank you. I was given a drawing from a customer (for a custom guitar) and I’m trying to make it as close as I can. I probably added too many points.
Pascal, is there an easy way that I can simplify these points? I just tried the simplify command but it appears that it didn’t work.
Hi Chris - it I were doing this, I’d draw a nice simple degree 5 curve and edit it into place adding or removing control points as needed.
-Pascal
Thanks for your help. I actually just removed a few points and cleaned it up. Worked like a champ!
So thank you!!!
Cheers!
-Pascal
@Chris-Mitchell - just because I had it open and was starting on an example, I went ahead and finished it up, in case it is helpful - my curves are by no means perfect but just by way of an example of drawing simpler curves and getting them how you want by point editing rather than trying to get it exactly righht as you draw the curve.
Fillet_PG.3dm (356.8 KB)
-Pascal
