Sweep with changing cross section
Sweep with changing cross section
(OP)
I'm having an issue creating a sweep.
The attached prt file should show the issue I'm having. When trying to accompish the sweep in 1 step, the section flattens out around the bend as shown by Swept (8). If doing in 2 steps (Swept (9) and Swept (10)), it comes out correct but wondering if there is a way to do it in only 1 step?
The attached prt file should show the issue I'm having. When trying to accompish the sweep in 1 step, the section flattens out around the bend as shown by Swept (8). If doing in 2 steps (Swept (9) and Swept (10)), it comes out correct but wondering if there is a way to do it in only 1 step?





RE: Sweep with changing cross section
You must change the start of the first Section
Regards
Didier Psaltopoulos
http://www.psi-cad.com
RE: Sweep with changing cross section
The best the way is:
1°) Edit the sketch then Reverse Direction of the sketch orientation
2°) Edit the swept then Reverse Direction of the first section
Regards
Didier Psaltopoulos
http://www.psi-cad.com
RE: Sweep with changing cross section
Reverse the direction of the first section in the swept command and use the alignment option 'By Points' to remove the twist.
http://files.engineering.com/getfile.aspx?folder=e...
www.nxjournaling.com
RE: Sweep with changing cross section
I have tried the same solution first, but alignment by points was not easy to explain
Regards
Didier Psaltopoulos
http://www.psi-cad.com
RE: Sweep with changing cross section
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: Sweep with changing cross section
Tools -> Reattach...
...and when the dialog comes up go to section of the dialog labeled 'Sketch Orientation' and simply hit the 'Reverse Direction' icon. After you 'Finish' the sketch, you may still need to reverse the direction of the cross section when you edit the sweep but it should work OK, as seen in the attached model.
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: Sweep with changing cross section
John - Thanks, that worked beautifully!
RE: Sweep with changing cross section
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: Sweep with changing cross section
How you manage to align points on circles, facing so much problem to drag those points. some time it snap to the adjacent point then it is difficult to drag after that. Is there an easier technique? thanks.
Raj
NX 8.5
RE: Sweep with changing cross section
Arc has start and end point, where circle doesn't have any. So, when aligning arcs, there will be no problem for NX, because NX will align those start points with no problem.
Well, if you use circles and Align by Points, it can work. But it is quite hard to define the correct alignment points.
So, if you check my examples, you will see one with Swept command. There are 3 new sketches; all circles are defined with 2 arcs. There was no problem in creating such swept body.
And if you want to complicate a little bit, you can write down the equation for the change of the radii along the curve. Then, when you have defined such equation, you can use Insert->MeshSurface->Sections->SectionCircle command.
If you check my other part, you will see the use of this command. In Tools->Expressions, you can see my equations:
length...this is associative measurement of your guide curve
t........this is just a parameter for NX equations (law curves, etc.). It will go from 0 to 1
x........additional variable for my ft function
ft.......the lenght of the curve, where you have a change of radii from 1.25in to 0.75in is 6in. So, if x is equal or less then 6in, then the radius is changing according to this equation:1.25-0.5/6*length*t. And, if radius is greater than 6in, the radius will be 0.75in
Then, when selecting SectionCircle command, you have to select your guide curve first. The spine curve is the same one. In section Control, select ByEquation and use the t and ft parameters.
That way, you will get nice transition from one circle to another with creating only the guide curve and no section curve.
Hope, that those two examples will help.
RE: Sweep with changing cross section
Thanks for those clarifications
Regards
Didier Psaltopoulos
http://www.psi-cad.com