Part Spun Outline Locally Inaccurate
Part Spun Outline Locally Inaccurate
(OP)
Hola!
What could be causing a local discrepency between a model and its spun outline?
I have a spun outline that is inaccurate in one area. Please see the attached picture. I have checked and re-checked my model and can not understand why the spun outline is giving me this .0001-ish taper in the ID. The curves used in the model sketch are horizontal, the blends are tangent, and everyhting is constarined with no conflicts. If I measure each end of bore the model, exactly as shown in the attached picture, both ends are 0.615.
BTW, no where else is the spun oultine doing this; all values between the model and the outline are identical.
What could be causing a local discrepency between a model and its spun outline?
I have a spun outline that is inaccurate in one area. Please see the attached picture. I have checked and re-checked my model and can not understand why the spun outline is giving me this .0001-ish taper in the ID. The curves used in the model sketch are horizontal, the blends are tangent, and everyhting is constarined with no conflicts. If I measure each end of bore the model, exactly as shown in the attached picture, both ends are 0.615.
BTW, no where else is the spun oultine doing this; all values between the model and the outline are identical.





RE: Part Spun Outline Locally Inaccurate
Re-select and measure again.
- Is the pictures from a "section" , then is that section perfectly thru the axis ?
RE: Part Spun Outline Locally Inaccurate
RE: Part Spun Outline Locally Inaccurate
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.
RE: Part Spun Outline Locally Inaccurate
I'm unsure which analysis tool to measure the circular edges at each end of the bore. However, I did use Minimum Radius to measure the cylinder (see the attached picture).
The radius was 0.3075 (or Ø.615). Is this enough to shough that there is no taper in the model?
RE: Part Spun Outline Locally Inaccurate
How the hell did I miss that?
RE: Part Spun Outline Locally Inaccurate
RE: Part Spun Outline Locally Inaccurate
RE: Part Spun Outline Locally Inaccurate
Information -> Object...
...select the two circular edges and hit OK. You will get a full report covering the information about the two curves/edges including diameters and much more.
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.
RE: Part Spun Outline Locally Inaccurate
Both arcs have the same radius.
RE: Part Spun Outline Locally Inaccurate
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.
RE: Part Spun Outline Locally Inaccurate
RE: Part Spun Outline Locally Inaccurate
Nominal is R.016", and that is what I started with. If I remove the R.016" from the Sketch, the Spun Outline is updated and the taper is gone. Any radius, as small as R.001" causes the spun outline to be tapered. For fun, I added a radius to other portions of the sketch. All the curves that were creating and ID become tapered after adding a corner rad, whereas all the OD with a new corner rad remain cylindrical in the Spun Outline.
Again, all the diameters are cylindrical on the solid model, but they become tapered in the Spun Outline. >_<
Argh! And now the Eng-Tips smileys don't work! o_O
RE: Part Spun Outline Locally Inaccurate
Mark Rief
Product Manager
Siemens PLM
RE: Part Spun Outline Locally Inaccurate
The Turning_Workpiece geometry was generated using Automatic.
RE: Part Spun Outline Locally Inaccurate
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.
RE: Part Spun Outline Locally Inaccurate
When the blend feature is on, the taper shows up in the Spun Outline. Turn the blend feature off, the taper goes away.
Anyway, I'm sending the models and CAM setup to GTAC today. Hopefully they will find something.
RE: Part Spun Outline Locally Inaccurate
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.
RE: Part Spun Outline Locally Inaccurate
In any event, I'm proceeding with my CAM work without the blend, and GTAC has already converted the IR to a PR with a very impressive sounding "priority code of 1 Critical".
I'll update this thread when I have some news.