Sheet tangency

[st4r]

Is there a way to tell nx(6) to make a sheet (mesh, surface,...) tangent to a datum plane or other sheets, but not just at the ends. For example, as seen on the picture, when I want to create arc between these 3 blue curves I just have to set it to be tangent to all three of them. I don't know and I don't care where does it starts, ends and it is tangent in the middle or it's radius. Blue curves are defined, but arc just has to be tangent to all of them. (arc's role is something like a blend). The problem is that I can't just extrude this section, because it's not constant, it changes a bit, and so does the arc. Thanks

 

[hudson888]

You can set the curve tangency up outside of the surface and you'll get close, but as far as I have ever known you need to break the sheet in two halves and use boundary controls to get better than that. Now if you use curvature controls (G2 at a minimum) as well then the result should be as good or better than it might have been were it a single sheet.

Best Regards

Hudson

www.jamb.com.au

Nil Desperandum illegitimi non carborundum

 

[JohnRBaker]

In NX 7.5 this is would be trivial using a 3-Face blend, however in NX 6.0 it's a bit trickier but there is little-known surface creation function which might fill your needs.

Go to Face Blend and set the Type to 'Swept Section'. Then set the Radius Method to Law Control which will add one additional option in the Constraining and Limiting Geometry section of the dialog labeled 'Select Middle Tangent Object' which can be a surface or a datum plane. Now this was an early attempt to provide a 3-Face blend type operation but it only works in limited situations, but it might in your case, so give it a try.

John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Industry Sector
Cypress, CA

http://www.siemens.com/plm

http://www.plmworld.org/museum/

To an Engineer, the glass is twice as big as it needs to be.

 

[st4r]

well, I' don't know am i doing it wrong, but it's not working.

 

[JohnRBaker]

My luck with that little-known pre-NX 7.5 function is maybe 10%, so don't feel bad.

John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Industry Sector
Cypress, CA

http://www.siemens.com/plm

http://www.plmworld.org/museum/

To an Engineer, the glass is twice as big as it needs to be.

 

[MickyV007]

Have you tried working with studio splines instead of an arc? You have much more tangency control with them then with a normal arc.

Best regards,

Michäël.

NX4.0.4.2 MP10 + TCE 9.1.3.8_build_0711 / NX6.0.5.3 + TC8.1 Unified / NX7.0.0.9 (native) / NX7.5.1.5 (native)

Belgium

 

[MickyV007]

And then i mean something like attached example. Or is this not what you mean?

Best regards,

Michäël.

 

[JohnRBaker]

I believe st4r's trying to create a SURFACE which is tangent to 3 faces/datums.

John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Industry Sector
Cypress, CA

http://www.siemens.com/plm

http://www.plmworld.org/museum/

To an Engineer, the glass is twice as big as it needs to be.

 

[st4r]

Yes, surface tangent to 3 faces, but thanks all for bothering,...