Can't get drawn blue lines to go black before rotate, then when rotated model displays black lines of the drawing.

[Anonymous]

Hi all, don't know if I'm in the right spot for this but here goes, I am drawing a parabolic curve using the conic curve command centered on the origin, then I offset if 3mm and draw a 3mm line at the vertex from one line to another, then cut away half of the two curves, at the outer part of the curves I go from the inner one (the original before the offset) and away from the origin for 8mm, then down for 3mm then back in towards the origin and to slightly overlap the outer curve (at this point the drawing fill with shaded blue then I cut the lines that overlap.

I then rotate the drawing about the origin and all looks good, except that I am now left with the outlines of the two curved parts of the drawing in black when I choose the shaded with outlines view, in just the shaded view the lines don't appear, plus I don't know what constraints I should be using between the conic curved lines and the straight lines.

Sorry for length of this post, as you will have noticed I am a complete newbie at this and any help greatly appreciated.

Thanks David

[g-andresen]

Hi,

Please share the file.

File > export > save as f3d locally  > attach it to the next post.

günther

[Anonymous]

Hi, thanks for your reply, file attached as requested.

Thank you

David

[davebYYPCU]

Can be fully constrained, do not trim this intersection, or you lose the offset constraint, 

otherwise, more dimensions and constraints.

Display settings are as you state, visible or not is your preference, but not a system fault.

Might help...

[Anonymous]

Hi thanks for replying, I have dimensioned the sketch as you have and not deleted the overlap as you suggest, the sketch still does not turn black, but it does turn black when the mouse pointer is hovered over the blue shading inside the sketch boundry, when the pointer is not on the blue shaded area the sketch lines change back to blue, my original complaint about the curved black lines (from the sketch) being visible on the inner and outer surfaces are still there, but the straight lines on the flanged area of the model are not, so why one and not the other since they are both part of the same sketch.

I should also state that I have drawn this sketch/model several times previouse and these lines were not present on the earlier models, so something has changed that is now causing this problem, when I switch to shaded view only no lines are visible, I only get these lines to show when the view is changed to shaded with visible edges.

Cheers for the help.

[davebYYPCU]

I had to add another couple of constraints, 

the end points of the lines had to be aligned on the origin with horizontal / vertical.

If you are speaking of this line, being on the dome, but not on the flange, then that is nature of the beast, the dome line depicts the start and finish of the revolve, but it is not required on the flange because that is a strict cylinder under the hood.

Shaded (without edges) the line disappears, a display routine.

I don't see a change to black, but darker blue with the mouse hover / click, whether it is fully constrained or not.

Might help....

[Anonymous]

Hi, take a look at this model created before the problem with the line came about, as you will see there are four quarters of a dome joined together, the black lines you see are the joints and note that the joints are not on the radius of the original dome but are shifted 9mm, there are no black lines on the radius of these quarter domes and nor were there any on the originaly revolved model, but now the line appears on any dome that I have drawn and rotated since,  and I don't see how this can simply be explained away as "the nature of the beast" because something is different now to what it was.

Thanks for your help

David

[g-andresen]

Hi,

take a look at zebra analysis:

shaded vs. shaded with visible edges         

In this case (left) the revolve tool causes the line.
In the zebra analysis, however, you can see that it does not represent an edge.

In the right-hand screenshot, however, the lines represent edges.

günther