intersecting sketch planes; relations.
intersecting sketch planes; relations.
(OP)
Hi, I have 3 intersecting sketch planes mutually perpendicular, and on two of them I have sketches already. On the third, I'm trying to make a new sketch (a cross section), which uses points from the other two sketches as a reference/relation.
Consider two rectangles perpendicular to each other, intersecting through their centres (One in XY-Plane, the other in XZ-Plane). Now along the length of this intersection I have a third plane (YZ-Plane) crossing the two sketches. Suppose I want to sketch a circle/ellipse whose circumference passes through the edges of each rectangle. This is similar to my situation.
I can draw points CLOSE to these edges and use those, but how can I set a relation that makes the circle/ellipse pass DIRECTLY through them?
When I view the third sketch head on, I have a cross representing the first two sketches/sketch planes, with point dotted along them, but cannot use these to make relations. i.e. have those dashed lines appear.
I hope to later on be able to make a surface out of this set-up (in the examples case, a cylinder, though mine will have multiple cross-sections and be more complex), so I expect that these relations will need to be set.
How can I do this?
Thanks.
Consider two rectangles perpendicular to each other, intersecting through their centres (One in XY-Plane, the other in XZ-Plane). Now along the length of this intersection I have a third plane (YZ-Plane) crossing the two sketches. Suppose I want to sketch a circle/ellipse whose circumference passes through the edges of each rectangle. This is similar to my situation.
I can draw points CLOSE to these edges and use those, but how can I set a relation that makes the circle/ellipse pass DIRECTLY through them?
When I view the third sketch head on, I have a cross representing the first two sketches/sketch planes, with point dotted along them, but cannot use these to make relations. i.e. have those dashed lines appear.
I hope to later on be able to make a surface out of this set-up (in the examples case, a cylinder, though mine will have multiple cross-sections and be more complex), so I expect that these relations will need to be set.
How can I do this?
Thanks.






RE: intersecting sketch planes; relations.
Depending on what shapes you are actually sketching, Points may have to be placed either in the two rectangles, or in the cross-section itself.
What purpose do the two rectangle sketches serve?
RE: intersecting sketch planes; relations.
RE: intersecting sketch planes; relations.
I managed to get the pierce relation working, but when I tried a filled surface, it lets me select the cross-section, but not either of the side plans: when I try toclick them it says "this sketch is not eligible." Why would this be, and how can I remedy it?
Cheers!
RE: intersecting sketch planes; relations.
Dan
www.eltronresearch.com
Dan's Blog
RE: intersecting sketch planes; relations.
RE: intersecting sketch planes; relations.
RE: intersecting sketch planes; relations.
Then add a sketch to the middle plane from the points that are on the plane's surface. That should get around your issue.
James Spisich
Design Engineer, CSWP
RE: intersecting sketch planes; relations.
I'd rather not post the file if that's ok, it's kind of a private project. (I realise this would make things easier though)
Jspisich:
I don't understand the method you are describing, please can you elaborate?
When I select filled surface, and try to choose either of my side plans as the patch boundary, it says "The sketch cannot be used for a feature because an endpoint is wrongly shared by multiple entities."
When I choose my cross-section as the patch boundary (This is a closed curve), it selects it no problem, and adds it to the list in property manager, and then when I try to click on either of the side plans afterwards, I get the error "this sketch is not eligible."
If I select either of the side plans as constraint curves at this point and hit the green tick, I get a pop-up saying:
"Rebuild errors:
the patch cannot be created. Try a different curvature method, alternate face or surface quality setting."
I have a feeling this last one is what I need to do, but it won't let me select the individual splines from the side plans, but only the entire sketches. This might be my problem, and could perhaps be solved by making the splines I am interested in, into a new sketch in its own right?
But then that first error worries me too.
RE: intersecting sketch planes; relations.
Michael
RE: intersecting sketch planes; relations.
Then if you have to, make your sketch on the 3rd plane. This time referencing to the 3dSketch instead of the other planes.
That may help. Then again, without a picture or a file (even then, I'm on SW2006) I can only guess. If I saw it I could probably tell you right offhand what to do.
James Spisich
Design Engineer, CSWP
RE: intersecting sketch planes; relations.
Just make a file which uses some shapes, different to what you are actually using, and post that instead. There may be an easier way to get the result you want, but it's difficult to visualise what that is.
RE: intersecting sketch planes; relations.
So far I have only sketches, no surfaces or solid parts. You can see there are a few cross-sections down the length of the shape, where I've added sketch planes (but I've only sketched the first one). I've also split the splines at these points.
So what I want to do for now, is to use that cross-section as the patch boundary, and use the four, forward-most splines (the ones I have split off) as constraint curves, to give a parabolic surface.
However, it only lets me select the entire sketches, as constraint curves (i.e. sketch1 and sketch3), and not the individual splines.
On my actual part, I also set a relation between the splines to add tangency between the endpoints, making the point at the end rounded, for both planes, but it didn't make a difference.
RE: intersecting sketch planes; relations.
RE: intersecting sketch planes; relations.
Anyway, I made a new part, similar to that, but made those splines as a sketch of their own, and it gave me what I wanted, using a filled surface, so I think if I can somehow, take those splines, and make them into a sketch of their own, then I'll get it working.
How can I go about this, making sure they are in exactly the same position as before?
Is there a way to simply select the entities, and click something like 'export to new sketch'?
RE: intersecting sketch planes; relations.
you could also add a sketch point at the origin to the sketch you're copying and when you paste into the new part, you can move the sketch into the right position by aligning the sketch point to the origin of the new part.
RE: intersecting sketch planes; relations.
Is there a method using blocks or something?
RE: intersecting sketch planes; relations.
RE: intersecting sketch planes; relations.
(P.S. Sorry for my late reply, I've been ill for a while, and haven't been able to0 access this computer with Solidworks on it.)
Thanks