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NX reference dimension in sketch

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jjjiang

jjjiang

Aerospace
Mar 21, 2016
2
Capture_znnxpn.png

I am trying to have the length of the lower segment changes as function of the upper segment. I don’t want to constraint the upper segment to any certain value but there’s a relationship I ‘d like to keep.
In the expression tab, I had the lower_length=upper_length+10, the problem is when I changed the upper_length, the upper_length variable doesn’t update.
It seems to me that NX records the reference as a constant and doesn’t keep track of the changes.

NX 10.
 
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That I am aware, Reference dimensions in Sketcher do not drive geometry. Untick the Reference box and see if your Sketch behaves as you want.

Tim Flater
NX Designer
NX 9.0.3.4 Win7 Pro x64 SP1
Intel Xeon 2.53 GHz 6GB RAM
NVIDIA Quadro 4000 2GB
 
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Xwheelguy, Thanks for the reply, but by untick reference box, i am defining the length of the upper segment, which is not what i want to do..I want to be able to drag the end point of the upper segment and the lower segment will change accordingly.
 
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Here is a similar thread that may help describe what is going on:
thread561-401436

For your particular situation, I would suggest breaking your sketch into 2 sketches. The first sketch will define the upper line. Finish the sketch then create an associative measurement of the length of the line; this will create an expression of the line length (a reference dimension, if you will) that you can use to drive the lower line length in sketch #2. Not as clean & satisfying as having everything in a single sketch, but it avoids the situation that you are currently in.

www.nxjournaling.com
 
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