Extending a surface with no parameters involved

[JChurch77]

Hello all,
I have some geometry that I need to extend .010" from approximate points. I am curious of the easiest way to do this and keep the existing geometry tangent to the section being extended. Can anyone give me some pointers on how to do this easily? I have attached section with note in file. Thank you.

 

[JohnRBaker]

OK, I first sewed the loose sheet bodies together, after deleting a redundant sheet body at the flat end of the model (BTW, who told you to set your modeling tolerance to such an small and nearly useless value? I set it back to the out-of-the-box default which should be fine for models of this size). Once I had a solid model (as a result of the sew operation) I then used the Synchronous Modeling function, Move Face and moved the flat-end -.010 inches along the X-Axis.

I've attached the finished model below.

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

http://www.siemens.com/plm

UG/NX Museum:

http://www.plmworld.org/p/cm/ld/fid=209

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

 

[JohnRBaker]

Sorry, I misunderstood what your request was. I'll have to get back to you after I've taken a second look at this.

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

http://www.siemens.com/plm

UG/NX Museum:

http://www.plmworld.org/p/cm/ld/fid=209

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

 

[JChurch77]

Our engineering department purposely tightens up the tolerances and actually sews the models together using that tolerance. I have told them this same comment of how ridiculous it is to use such a close tolerance, it causes an extreme amount of accuracy in order to get our models to sew together. John, I really appreciate your help in these forums I was hoping you would be the user that would respond. Thank you.

 

[JChurch77]

Hi John,
Yes Im trying to extend the other end .010" longer but maintaining the geometry as close to original as possible.

 

[JohnRBaker]

Smaller tolerances do not assure higher quality, only more complexity and more modeling failures. It's like our shop superintendent once told me back when I was working in the 'real world'. If you do nothing else but tighten the tolerance on your drawings, the only thing that he could guarantee would be that that less parts would pass inspection thus causing our scrape rate to go up.

As for your model, I'm not really sure exactly what it is that you're attempting to do. Are you attempting to make your entire model a 0.01 inch shorter by 'scrunching' the middle section near those points?

OK, I decided to try scaling the Solid Body using the Axisymmetric method (along only one axis, in this case the X-Axis). So I measured the current length of your part, then factored in the 0.01 distance and came up with a scale factor of 99.25%, which I applied (see the attached model).

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

http://www.siemens.com/plm

UG/NX Museum:

http://www.plmworld.org/p/cm/ld/fid=209

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

 

[JChurch77]

No what I want to do is extend the tip of the part (opposite of the more flat end) from the points, .010". So when the model is completed it will be .010" longer than it is now. Thanks.

 

[JohnRBaker]

OH, you want to make it longer. OK, I just did the reverse. Again, using the Axisymmetric scaling method I used a scale factor of 100.75% while keeping the flat end of the model stationary. The model is now 0.01 inches LONGER in the minus X-direction. And while it is true that the scale was applied to the entire body, but ONLY along the X-axis, that this just might prove to be acceptable as a way to do what you asked to do.

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

http://www.siemens.com/plm

UG/NX Museum:

http://www.plmworld.org/p/cm/ld/fid=209

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

 

[JChurch77]

Thats very close, however I need to keep the geometry the same prior to those points. Scaling the model does in fact make it longer by .010 but also changes the contour of what is existing. Existing meaning, this part is burned into a mold and all I am wanting to do is extend the end of the part without influencing part geometry already burned into the mold. This is not an easy task without recreating all this geometry. Again, this is very close and I do appreciate the effort.

 

[JohnRBaker]

OK, one more try. See if this meets your criteria.

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

http://www.siemens.com/plm

UG/NX Museum:

http://www.plmworld.org/p/cm/ld/fid=209

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

 

[JChurch77]

Yeah, same thing I did. I used your concept of Axisymmetic scale type and scale it closer to the section? Looks better, they are going to have to deal with this. Thanks alot! This Axisymmetric scaling is a good tool.