Break or split geometry in sketch

[cobaltred]

First off forgive my basic questions I am new to NX, but so far the responses have really helped get me further, so thanks.
My first question:When working on a sketch in direct sketch or task mode on a plane, not individual free curves in 3d space,is there a break or split command,I found trim and extend but what if I want to keep the geometry?
Say I want to just divide a circle with lines that radiate out from the center at different angles?
My second question:First off In Shape Studio say I create a simple four point surface looking from the top view and I edit the surface with X-form to make it a say degree 3 single span.Then lets say half of the control poles I move with X-form to be on the right side of the top plane and the others on the left(in otherwords straddling the WCS YZ plane.
Is there a feature that will apply symmetry to the surface so that I only have to manipulate half of the poles on one side and the other side would automatically mirror the pole positions? from what I can see the symmetry command only snaps the edge of a surface to a mirror plane of your choice.

Thanks a bunch. Win 7 64 bit NX 8

Buddy.

 

[Xwheelguy]

In the case of the divided curve, I'd trim it down to an arc and then mirror it about the dividing lines until a full circle is achieved. I would make the dividing lines reference geometry and assign equal radius constraints to the arc segments. Once you get 1/4 of the circle mirrored, you can mirror the entire first 90° to get 180° and then mirror 180° to get the full circle. You could also just constrain the dividing lines by their angles and leave the circle alone unless you absolutely require 360° of arc segments for one reason or another.

As far as X-form goes, I'd imagine you'd have to trim the surface to the plane, X-form (making sure the edge on the plane remains on the plane) then apply symmetry command then finally Mirror surface about said plane. If you were moving them all in the same direction (positive or negative in Z only), you could grab all poles and move them, but once you start moving in the X direction, you'd have to move in opposite directions, so just one side at a time when straddling the YZ plane.

You could also keep track of the step values and move in one direction at a time, performing the operation once on each side of the YZ plane, moving in the exact opposite X direction each time. Would tend to be a little tedious. There might be something you could use in Synchronous Modeling on a solid

Hope this makes sense and/or helps.



Tim Flater
NX Designer
NX 7.5.4.4 MP2
WinXP Pro x64 SP2
Intel Xeon 2.53 GHz 6GB RAM
NVIDIA Quadro 4000 2GB

 

[cobaltred]

Thanks,I guess I will have to find a workflow but it goes on my number one list of things to add to the sketch tools and while they are at it
how about a divide command so that you can do things like divide a spline into equal lengths and specify how many lengths.Rhino certainly has a split
and divide command and many cad programs I can think of.Hum life without split and divide.

Thanks Buddy.

 

[SiW979]

In terms of splitting lines or more specifically circles, why not use create a nomral circle on a plane (Insert --> Curve --> Lines and Arcs --> Circle, Centre radius) Then use the divide curve command (Edit --> Curve --> Divide Curve) here you have options on how you want to divide your curve, how many segments etc. Then create a sketch and either project the curves into the sketch or use the Add Existing Curves command. You can then apply constraints etc.?

Hope this helps

Si.

Best regards

Simon NX7.5.4.4 MP5 - TC 8

http://www.jcb.com