using Datums in a sketch NX 9.0 1

[swampjeep]

Is there a trick to using datums in a sketch?

I'm trying to add dims from a line in a sketch to a datum and I can not pick the datum.

 

[cowski]

Check your selection filter.
thread561-376171

www.nxjournaling.com

 

[swampjeep]

Nope it says within work part

 

[jerry1423]

The other filter.
It is a pull down that is best set at No Selection Filter but in your case it is probably set at solid body or curve

 

[ewh]

Try picking the datum first, curve second.

ôKnow the rules well, so you can break them effectively.ö
-Dalai Lama XIV

 

[carlharr]

Maybe a silly question, but what order are your sketch and datum in the feature tree?

http://www.jcb.com

NX 8.5 with TC 8.3

 

[JohnRBaker]

Yes, in order to be able to reference some object from within a Sketch, it has to appear BEFORE the Sketch in 'Timestamp Order' when you looking at the Part Navigator.

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

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

 

[swampjeep]

if you look at the pic I attached, you can see that I did have "No Selection Filter" for the other filter, and I use EDIT with Rollback as the default for my sketch editing, so any datums created after would not even appear.

I had to create a line, constrain it to the datum, then dimension to it, only way it would work in that sketch for me.

 

[stephlouv]

I think it's this free line you're trying to constrain, right ?
Which datum are you speaking about ? Datum plane or Datum Axis ?
The Absolut/WCS or the intermediate sketch Csys ?
(did you try to pick it first, I also experienced this)

"My english is bad ? That's why i'am french."

 

[jerry1423]

I really think it's the problem that Cowski is eluding to in his reply.

 

[swampjeep]

OK, this seems to be the problem we found, in sketch, we can dimension to datums until we add an angular dimension, once we add an angular dimension, we can not pick any datums when dimensioning in the sketch. We proved it by removing the angular dimensions then added the required dimensions using the datums, but once we added an angular dimension to the sketch it would again not allow picking datum. We found this in another part, and I went back to this one and it acts the same way.

We can repeat this problem.

 

[MFDO]

Try picking First the Datum plane and then the Element!

That is the way I found it to work.

Michael Fernando (CSWE)

http://www.solidCADworks.com

Tool and Die Designer
Siemens NX V9.0 + PDW
SWX 2013 SP3.0 X64
PDMWorks 2013
Logopress3
FastForm Advance
FormatWorks

 

[JohnRBaker]

swampjeep, have you called this into GTAC yet? BTW, I tested NX 9.0.3.4 and was not able to duplicate what you're describing. However, since you say that you can reproduce what you've found, I'll give you the benefit of the doubt, but since you say that you can duplicate it, PLEASE contact GTAC and have them look at this. Of course, if you've not yet installed the latest MR (NX 9.0.3.4) you may want to do that first.

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

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

 

[rbarnthouse]

I have noticed this as well. If you change the measurement method to "inferred" it should work. Not sure why horizontal and vertical options won't allow to use a datum.

 

[JohnRBaker]

Ah, I think I see what's happenings.

'Horizontal' and 'Vertical' dimensions are like 'Point-to-Point', in that they only allow you to select Points and/or Curves since in those instances the 'points' are what's being dimensioned, whereas in the case of 'Perpendicular' (for the first pick) and 'Angle' dimensions, a Datum can be selected since it's being used to define a line/plane-of-reference. You can sort of prove that by using the 'Inferred' method and selecting a Datum. In those cases, the only dimension types being created will be 'Angle' or 'Perpendicular' whereas if you had selected only lines you might have also gotten an occasional 'Horizontal', 'Vertical' or 'Point-to-Point' dimension. You can verify the type of dimension created by going back and editing that dimension and checking the 'Method' indicated if it's a Linear Dimension or the dialog itself, if it's an Angular dimension.

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

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