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Chordal Fillet

Hey!

 

Is there a way to create a chordal fillet in NX? I'm trying to find an analogous Edge Blend command that does this:

 

http://catia-tnt.blogspot.com/2017/04/chordal-fillet.html

 

 

6 REPLIES

Re: Chordal Fillet

Phenom
Phenom

You can try the Face Blend and the Aesthetic Face Blend (the latter with Mach3 bundle) command.

 

Ciaochordal.png

Re: Chordal Fillet

Pioneer
Pioneer
https://docs.plm.automation.siemens.com/tdoc/nx/11.0.1/nx_help/#uid:create_freeform_fff_fillet
Chapter "Rho "

Сhannel for NX users (Russian language) https://www.youtube.com/channel/UCvf0Rp4Sy6bRRyTYBF9rnJQ

Re: Chordal Fillet

Thanks Valeo, Cesare's post is a little more on point for me though

 

Cesar, this what I was looking for; I'll accept as the solution soon but.. now I have a new problem:

 

The angle between the two surfaces goes to zero at the edge of the part (it's supposed to, it makes for a nice design). So on my diagram as x increases, theta goes to zero.

 

Using the Face Blend command with Width Method set to Consant gives me the error:

Canot construct blend. The size or direction of the blend might not contact the faces selected.

 

Using the Aesthetic Face Blend with the By Chord Length option checked, I get the error:

Unable to create blend due to complete cut off of right tangent holding line.

 

It's a little tricky to visualize, I might just put in a support ticket so I can share some screen shots.

 

Re: Chordal Fillet

Genius
Genius
NX usually doesn't like that type of washout scenario when using the blend tools. You're probably going to have to build a mesh type of surface - look at Through Curves, Through Curve Mesh, Studio Surface or even Section Surface.
-Tim

Re: Chordal Fillet

Pioneer
Pioneer

How do you imagine this idea in mathematics?
A certain fillet turns into a line
  with the same distance between the ends of the circle (and then - the line).
Your task with a constant chord - is mandatory? Can it make sense to replace with some other connection? If not fillet, then for example a bridge?
https://docs.plm.automation.siemens.com/tdoc/nx/11.0.1/nx_help/#uid:xid1128417:index_modeling:xid867...


Сhannel for NX users (Russian language) https://www.youtube.com/channel/UCvf0Rp4Sy6bRRyTYBF9rnJQ

Re: Chordal Fillet

Thanks Valeo, Tim

 

Yeah one way would be to split it up. Go 75% of the way with the chordal fillet and the make the last 25% a blended surface but because the end of the fillet first would not be sharp, it is hard to select the right points to create the dummy surface from.

 

In terms of other tools, ideally what I want is the Through Curves tool configured using By Points in the alignment section but where I have much more control over the points (like creating them outside). Through Curve Mesh is, on the other hand, too much control - I end up having to create far too many cross curves to approach the desired surface.