Multiple problems with presspull and extrude commands

[aalkayyali98]

I am using AutoCAD 2019 and I am having multiple issues with the presspull command and the extrude command.

I am trying to extrude a shape (spline) I designed (file attached) and it only works with the extrude command, which in itself is one problem. When I try using the presspull command, it is able to find the layer/region I want to presspull, and when I click, it is showing an extrusion path when I move my cursor up or down, but when I apply that extrusion by hitting enter/return, nothing happens. Also, when the extrude command works the output in the properties tab is an extruded surface instead of an extruded solid. I have also read somewhere that converting it from spline into polyline should work. Tried that using the PEDIT>Spline command and it converted into a "3D polyline" as per the properties tab, but still I am getting the same results of the presspull command not working and the extrude command giving an extruded surface instead of an extruded solid. Now I'm trying to unpolyline it by using the command PEDIT>Spline Curve or PEDIT>Undo and neither of them put it back to spline. I tried the SELECTIONPREVIEW command solution of setting it to 3, but it was already set to 3. One other problem I am having is that when I am trying to track/determine the region to presspull (after selecting the presspull command), the cursor becomes very laggy until I click on the region.

For reference, I have added another shape (polyline) I designed in the file as well which gets extruded and presspulled perfectly into a solid. The problematic shape is coloured magenta and the correctly functioning shape is coloured cyan.

[maxim_k]

Welcome to Autodesk Forums!

Hi Ali,
You attached drawing where the shape you are trying to presspull / extrude is already converted to 3D Polyline. So I cannot check the problem with spline.
Plus I see that the shape is rotated in 3D so it is not parallel to XY plane of current UCS.
Can you attach the original drawing with spline?

BTW: I think you have troubles with shape, because the original spline is not flat object - not all of its vertices lay on the same plane.

[aalkayyali98]

I think the problem could be that the shape coordinates are not on the same planes, but I'll just say that the shape coordinates are intended to not be on the same planes so I can't change it. This problematic shape is actually based off a top section of a 3D piece. I took it off by exploding the 3D piece. Basically what I am trying to do is extrude only a small part of this top section into a 3D solid.

I just found out something, the presspull command is unable to find the region of the original top section (the extrude command still works but yet again gives an extruded surface). I have attached the 3D solid (coloured red), along with an exploded version of it along with the top section (both coloured green).

I designed this 3D solid by first presspulling the cyan coloured polyline, and then slicing this 3D solid using a cylindrical slicing tool so that the height is no longer constant. The problematic shape is the same one coloured in magenta. The file is again named "help.dwg".

This 3D solid is actually a turbine blade which I am using for a turbine nozzle guide vane system (this is for a jet engine). All I am trying to do is extrude only a small part of the trailing edge of the blades (in SW Isometric View). I have also attached this nozzle guide vane system model named "Turbine Stator.dwg".

Right now I mainly need help only with the problematic shape I am discussing, but I added the whole background story only if it may help.

[maxim_k]

A still don't see any splines in "help.dwg" drawing, plus it is not clear for me IN WHICH DIRECTION you need to extrude that shape.
And again - presspull and extrude command will work correctly (the result will be 3D Solid) only with planar objects.

[aalkayyali98]

Yes you are right I apologise. I have now converted into spline by exploding it and then joining it again (the spline shape is now coloured in yellow). I am trying to presspull/extrude the yellow shape in the positive z-axis direction. So is there a way to do this now it is a spline?

If it is not possible to use the presspull/extrude command for the yellow shape, do you know of any other command/set of commands/way to converting the yellow, non planar shape to a 3D solid with a certain height?

[maxim_k]

>>>>I am trying to presspull/extrude the yellow shape in the positive z-axis direction. So is there a way to do this now it is a spline?
No, it is impossible, because the shape you are trying to extrude is not planar.

But why not to use subject editing in your case.
As I understand, you need to "extrude" upper face of red 3D solid in the drawing help.dwg.
Am I correct?
If yes, you can select upper face of 3D Solid by holding Ctrl key and picking with mouse on the face. you will see red dot, now pick with mouse on this red dot and move mouse along Z axis - 3D solid is getting taller:

I attached your drawing where I created 3D Solid (yellow one). is it what you need?

[aalkayyali98]

Yes the yellow 3D solid is sort of what I need, the only difference is that I only want to extrude a certain section of the yellow spline I have attached. If I'm not mistaken first I make a trimming region which defines that certain section and then trim the lines that I do not want. After that I make a 3D solid out of the now trimmed (and joined) spline using whatever method you used to create the yellow 3D solid. May you tell me how you were able to create the yellow 3D solid?

[maxim_k · Accepted solution]

I created a copy of red 3D Solid, then using the method with subject selection I made the copy taller (don't know exact height, but it does not matter to describe the principle).
Now using object snap I combined the copy and the original, so that their bases match. Then I used SUBTRACT command to subtract original object from its taller copy.

[aalkayyali98]

Thank you very much, I got exactly what I need. I never even new about the subject editing command/method. You also gave me an idea to do the same thing but instead of subject editing, I can move endpoint to endpoint then move one of the copies up above the other slightly and then subtract. Again, than you very much!