Need some help: transition surface/solid

[eex23]

Hi all,

need some help or advice. Look at the attaced prt file (nx7). I need to create transition between (150mm) two rails (bigger one is standard R65 type rail, and smaller one is switch-blade rail). Transition surface should be tangent to corresponding surfaces of each rail. I tried using "bridge curve" and then "surface through curves", but the result is not very good.

Thanks.

We are using NX7 64 bit

 

[JohnRBaker]

Is this what you were looking for (see attached model)? I used a 'Through Curves' surface with 'Point' alignment (double-click on the 'Trough Curves' feature to see what I mean by that).

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:

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

 

[eex23]

Thanks, yes. Your model is ok. But I dont understand, how are you adding these aligment points? What I am doing wrong (see attached video)?

 

[vrishraj]

Hi John,
I checked your file, two of the small blend area faces seems to be not smooth. Pl check the image file. Just to know the reason for this.
eex23,
Pl check the alignment points in your movie file its not matching!

Raj
NX7.5

 

[eex23]

vrishraj: How to match these points? How to add extra point/points? Look at the attached video. Cant get to the point yet... :/

 

[vrishraj]

Once you pick a point system assign corresponding point on the other side, if that point is acceptable, you can keep or else move the sphere to the nearest end point using snap point option. Check has to be done for all the points,
Hint : check the system drawn line between those two points for all alignments

Raj
NX 7.5

 

[eex23]

Few movies again. It seems, that only automaticaly added points could be matched. If I add them manualy, system adds it anythere and it is not possible to match them. There is the problem then?

 

[vrishraj]

Here the catch is, if you keep your cursor on the existing alignment point, it gives the option to move and snap to the specified point. If your cursor is on the curve and pick a point it adds alignment points with a construction line. You practice using simple alignment using just a line and arc with Through curves, then you will get the flow.

Raj
NX 7.5

 

[capnhook]

I count four bad faces, but the model can be fixed.

"Extract" all the faces (except the four bad ones)

Create four new faces "through curve mesh"

"Sew" all the faces together into a new solid

Proud Member of the Reality-Based Community..

 

[Toost]

Delete ( synchronous) the small blends before creating the transition. Add new blends after.
I assume that the problems arise since we are trying to create a "super transition", many faces and many constraints at the same time, and the math model that works for the big-flat faces don't work for the small-curved faces at the same time.

Regards,
Tomas

 

[JohnRBaker]

Of course, if the two sections had had the same number of segments (curves) representing the same basic topology (flat areas lining-up with flat areas, blends lining-up with blends) then there would have been NO need for using the point alignment scheme in the first place.

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:

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

 

[capnhook]

Of course.

Proud Member of the Reality-Based Community..

To the toolmaker, your nice little cartoon drawing of your glass looks cool, but your solid model sucks. Do you want me to fix it, or are you going to take all week to get it back to me so I can get some work done?

 

[SiW979]

I did it using through curves mesh, however to get good results, you need to break it down in to lots of smaller surfaced and then sew them together. Use examine geometry to check.

Cheers

Si.

Best regards

Simon NX7.5.4.4 MP5 - TC 8 www.jcb.com

 

[eex23]

JCBCad: I think you posted prt file from another topic
Anyway thanks

 

[SiW979]

So I did. Sorry, here is the right one

Best regards

Simon NX7.5.4.4 MP5 - TC 8 www.jcb.com