3D sketch

[rodek]

Hello,

I'm trying to make a 3D pipe, see attached pdf

I have problems to make de 3D sketch, specialy when the radius from 175 goes over in radius 400.

Any tips welkom

[JDMather]

What version of Inventor?
Why only one view?

Attach the *.ipt file of your attempt here.

[rodek]

Hello,

I come a long way, but the second sweep causes problems.

Best Regards

Rob

[rodek]

here is the file

[JDMather]

3D sketches are not needed for this design.

I will post my "solution" later today.  

[blandb · Accepted solution]

You can just use an origin plane as a 2d sketching plane to make the vertical line and 90 degree radius curve. Then use a work plane to get the top curve, and sketch as a 2D sketch, then sweep it all at once. Unless this top arced segment is not a planar multi-radius curve, is it changing in vertical pitch as it is curving?

[cadman777 · Accepted solution]

The year 1960, wow! Gotta luv the drawing board guys.

Like blandb, I'd use 2d sketches.

You have to think about how the arcs attach and how they run.

Maybe you have to 'play with it' until you get it right, b/c not enough dimensions are given to clarify what's happening along the bends @ the joints.

Assumptions:

1. all arcs are tangent

2. all arcs connect at each end with no straight segment between them

3. arc 400mm center point is located @ the centerline of the down leg

4. if all arcs are connected per #1, #2 & #3, and they don't work, then you have to find what to change to make them work. In this case, it was the transition between the 175mm arc and the center vertical segment (not shown in the drawing). That segment must have a straight line before it connects to the 'down' arc (elbow). If you do that it will work.

Notes: I added the flanges for clarity (they're modified ANSI inch flanges).

             Also, I added a bend radius (elbow) Parameter.

See attached part file...

[JDMather · Accepted solution]

@rodek 

It is very rare that any extraneous workplanes or 3D sketches are really needed. (See Attached)

[rodek · Accepted solution]

Thanks you all for the examples. This will help, thanks a lot.