Sketcher and Expressions
Sketcher and Expressions
(OP)
I am needing some help on a part as quickly as possible. I am trying to make make this model in NX4 4.0.0.25 but I need to to use sketcher and build in expressions so that when I change a radius or length ect... the whole part updates and does not blow up. I have the whole part modeled up and expressions built in how I am thinking it should work but I think there are some constraints not in place that need to be or something because it blows up. If I change the R45. to R55 in the extrude cut all of the lines go everywhere. I also have expressions built in so when a dimension changes on the extrude cut the same dimension will follow on the revolve cut. I have not used Unigraphics in a while so I am getting rusty with it. My last job I was using Solidworks and I wouldn't have a problem doing this. If someone could show me what I am doing wrong I would greatly appreciate it.
Thank you,
JT
Thank you,
JT





RE: Sketcher and Expressions
John R. Baker, P.E.
Product 'Evangelist'
NX Design
Siemens PLM Software Inc.
Cypress, CA
http://www.siemens.com/plm
http://www.plmworld.org/museum/
RE: Sketcher and Expressions
The co-incident end points of the lines weren't constrained as such, one line was fixed which stopped the sketch from working and there were a couple of other constraints that I rebuilt before coming to an equivalent result to what John had.
Cheers
Hudson
RE: Sketcher and Expressions
RE: Sketcher and Expressions
RE: Sketcher and Expressions
I would suggest that you try and avoid using the 'Fixed' constraint if you expect the curve to move or change size. Fixed is fine for reference curves that are not part of the profile of curves, things that you measure FROM but not things that ever need to update themselves. When a curve is fixed it will NOT move or change size even is you edit driving expressions, like the radius of the arc in your original Sketch. Remember, FIXED means FIXED!
John R. Baker, P.E.
Product 'Evangelist'
NX Design
Siemens PLM Software Inc.
Cypress, CA
http://www.siemens.com/plm
http://www.plmworld.org/museum/